From patchwork Mon Feb 10 06:02:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372497 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8923B92A for ; Mon, 10 Feb 2020 06:03:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 667D62467C for ; Mon, 10 Feb 2020 06:03:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314593; bh=RQJBSrCBQoRjRPzNpPiEOUwoi4zmhWHM5Ddo22O4ojU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WkV5dCHRClSPIMwCbgbxmecE+78IVIVm+e3hyyNqj/M80Stk5v66KubdnoDotul1y 0oPqyZvF+q8XEy2tImzQyxcAxkwO0z+qCmaNwT5bqgwLuS5Ul6juWbWuwDQkceRMP5 Nx+cet8FP0K97u60dD84oc2SAbtK+FHxzkSpPJTw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727546AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36292 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727437AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=/hfBTm+pwI/qMUzI6610HUXH01FV0FRb49kTIzGz0Ww=; b=YY9qMpTF6MirjG2R1XRdVVXM/9 N2+i4gF3kDFNMMHfPjhir+tVy3kgLQ2Y+BluhTTxFRka0VQmvRE9kvlYdNwX60GvAGy/CrPTLRlt9 G42D6+D8EE+h8b2yY9SuOheFq81KCSUVgwX6VnNm1a3DdIu35kocWvdgtUb3vivkZJ4fw+jsSuXj1 6NVt2lsSLNxH3HZ0gS/XvEVQB8+So8pcGKeOFTN2xgRb8YwxL0qYpeXWbc160C13lCiJXmSsTkQcN v3PUJPxMfjgpG7WxZsBlHCZRnnX9V9gF2ckDxXPT83FRs5I92MJEEemVUZrZgkqSMvsH5AlSBMAJE 6idRmYSg==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tb-DC; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A1-00C2Ud-Nl; Mon, 10 Feb 2020 07:03:09 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 01/28] docs: kvm: add arm/pvtime.rst to index.rst Date: Mon, 10 Feb 2020 07:02:39 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add this file to a new kvm/arm index.rst, in order for it to be shown as part of the virt book. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/arm/index.rst | 10 ++++++++++ Documentation/virt/kvm/index.rst | 2 ++ 2 files changed, 12 insertions(+) create mode 100644 Documentation/virt/kvm/arm/index.rst diff --git a/Documentation/virt/kvm/arm/index.rst b/Documentation/virt/kvm/arm/index.rst new file mode 100644 index 000000000000..e039d9b1e076 --- /dev/null +++ b/Documentation/virt/kvm/arm/index.rst @@ -0,0 +1,10 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=== +ARM +=== + +.. toctree:: + :maxdepth: 2 + + pvtime diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index ada224a511fe..488c6370a447 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -10,3 +10,5 @@ KVM amd-memory-encryption cpuid vcpu-requests + + arm/index From patchwork Mon Feb 10 06:02:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372503 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 73F8417F0 for ; Mon, 10 Feb 2020 06:03:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3485124680 for ; Mon, 10 Feb 2020 06:03:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314596; bh=CbkvSewKUyI8PvtErwBLPCfB8u0zSbcxVpd8Rv+A0ow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=h0XWwWTO0PJgEp+JGveeQrqQTDDgIfp01gop1Ps+v4kuF0oiy6HNGX3Ql+7z5xX4l OqFajXD2Q34vboliXs9knsn5XkCappKn6ktTIhGQfc2XQQVznE0SI1tafyZ+1+ZP9j W8V1/tRkR5Cw/VePWFSVoo6ytBCWTPMaqgkoP+jY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727608AbgBJGDO (ORCPT ); Mon, 10 Feb 2020 01:03:14 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36450 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727577AbgBJGDO (ORCPT ); Mon, 10 Feb 2020 01:03:14 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=S3bjPYUMQW+GGQif4RMgG536QJO3iSKUsTvcmGMtaWo=; b=lizpuobPJzqb2809joDK8hVHNx aoF9iNRbDemJhKn+gV6IJmeetwohHzSXgdWQV+Vnos4GcrEMS2PEjgWen/w98hHKr+RAS9+lNfbO/ ubnmc3i5ja5tjWa9i9spq8V9uODUWgWILp1ZQ2aLTjHYeZQuHAYJf73j/zTqTc0Bqp7kXS4Me6z5H bkcbKMSpY/t1zJVgmbg7a0UjnM88ip5n6lQrfsaLiefGps4q6uenstZa+0Dy6wfePw24R9PSeQ6WT 6zWnSN05Vx197x2eWPZU/PTwCtA2JHZiz4MIPstkKxE7k/GC0bYWlDSAXWelBkWcgXIMH308BGptL dCMVDC4A==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tc-Eo; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A1-00C2Uj-Pt; Mon, 10 Feb 2020 07:03:09 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Jonathan Corbet , Jeff Dike , Richard Weinberger , Anton Ivanov , linux-doc@vger.kernel.org, linux-um@lists.infradead.org Subject: [PATCH 02/28] docs: virt: convert UML documentation to ReST Date: Mon, 10 Feb 2020 07:02:40 +0100 Message-Id: <672d894363a282ff8975640a9a61b2dd7ab987e7.1581314316.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Despite being an old document, it contains lots of information that could still be useful. The document has a nice style with makes easy to convert to ReST. So, let's convert it to ReST. This patch does: - Use proper markups for titles; - Mark and proper indent literal blocks; - don't use an 'o' character for lists; - other minor changes required for the doc to be parsed. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/index.rst | 1 + ...odeLinux-HOWTO.txt => user_mode_linux.rst} | 1705 ++++++++--------- 2 files changed, 789 insertions(+), 917 deletions(-) rename Documentation/virt/uml/{UserModeLinux-HOWTO.txt => user_mode_linux.rst} (75%) diff --git a/Documentation/virt/index.rst b/Documentation/virt/index.rst index 062ffb527043..0a8f7fda64ad 100644 --- a/Documentation/virt/index.rst +++ b/Documentation/virt/index.rst @@ -8,6 +8,7 @@ Linux Virtualization Support :maxdepth: 2 kvm/index + uml/user_mode_linux paravirt_ops .. only:: html and subproject diff --git a/Documentation/virt/uml/UserModeLinux-HOWTO.txt b/Documentation/virt/uml/user_mode_linux.rst similarity index 75% rename from Documentation/virt/uml/UserModeLinux-HOWTO.txt rename to Documentation/virt/uml/user_mode_linux.rst index 87b80f589e1c..6085d2c0f8a8 100644 --- a/Documentation/virt/uml/UserModeLinux-HOWTO.txt +++ b/Documentation/virt/uml/user_mode_linux.rst @@ -1,12 +1,17 @@ - User Mode Linux HOWTO - User Mode Linux Core Team - Mon Nov 18 14:16:16 EST 2002 +.. SPDX-License-Identifier: GPL-2.0 - This document describes the use and abuse of Jeff Dike's User Mode - Linux: a port of the Linux kernel as a normal Intel Linux process. - ______________________________________________________________________ +===================== +User Mode Linux HOWTO +===================== - Table of Contents +:Author: User Mode Linux Core Team +:Last-updated: Mon Nov 18 14:16:16 EST 2002 + +This document describes the use and abuse of Jeff Dike's User Mode +Linux: a port of the Linux kernel as a normal Intel Linux process. + + +.. Table of Contents 1. Introduction @@ -132,19 +137,19 @@ 15.5 Other contributions - ______________________________________________________________________ - - 1. Introduction +1. Introduction +================ Welcome to User Mode Linux. It's going to be fun. - 1.1. How is User Mode Linux Different? +1.1. How is User Mode Linux Different? +--------------------------------------- Normally, the Linux Kernel talks straight to your hardware (video card, keyboard, hard drives, etc), and any programs which run ask the - kernel to operate the hardware, like so: + kernel to operate the hardware, like so:: @@ -160,10 +165,10 @@ The User Mode Linux Kernel is different; instead of talking to the - hardware, it talks to a `real' Linux kernel (called the `host kernel' + hardware, it talks to a `real` Linux kernel (called the `host kernel` from now on), like any other program. Programs can then run inside User-Mode Linux as if they were running under a normal kernel, like - so: + so:: @@ -181,7 +186,8 @@ - 1.2. Why Would I Want User Mode Linux? +1.2. Why Would I Want User Mode Linux? +--------------------------------------- 1. If User Mode Linux crashes, your host kernel is still fine. @@ -204,14 +210,16 @@ +.. _Compiling_the_kernel_and_modules: +2. Compiling the kernel and modules +==================================== - 2. Compiling the kernel and modules - - 2.1. Compiling the kernel +2.1. Compiling the kernel +-------------------------- Compiling the user mode kernel is just like compiling any other @@ -220,7 +228,6 @@ 1. Download the latest UML patch from - the download page - . - - - 3. Make a directory and unpack the kernel into it. + 3. Make a directory and unpack the kernel into it:: host% mkdir ~/uml - - - - - host% cd ~/uml - - - - - host% tar -xzvf linux-2.4.0-prerelease.tar.bz2 - - - - 4. Apply the patch using - - + 4. Apply the patch using:: host% cd ~/uml/linux - - host% bzcat uml-patch-2.4.0-prerelease.bz2 | patch -p1 - - - - 5. Run your favorite config; `make xconfig ARCH=um' is the most - convenient. `make config ARCH=um' and 'make menuconfig ARCH=um' + 5. Run your favorite config; ``make xconfig ARCH=um`` is the most + convenient. ``make config ARCH=um`` and ``make menuconfig ARCH=um`` will work as well. The defaults will give you a useful kernel. If you want to change something, go ahead, it probably won't hurt anything. @@ -288,13 +271,13 @@ Note: If the host is configured with a 2G/2G address space split rather than the usual 3G/1G split, then the packaged UML binaries - will not run. They will immediately segfault. See ``UML on 2G/2G - hosts'' for the scoop on running UML on your system. + will not run. They will immediately segfault. See + :ref:`UML_on_2G/2G_hosts` for the scoop on running UML on your system. - 6. Finish with `make linux ARCH=um': the result is a file called - `linux' in the top directory of your source tree. + 6. Finish with ``make linux ARCH=um``: the result is a file called + ``linux`` in the top directory of your source tree. Make sure that you don't build this kernel in /usr/src/linux. On some distributions, /usr/include/asm is a link into this pool. The user- @@ -310,7 +293,7 @@ corresponding directory in the appropriate kernel pool. If you don't have the latest kernel pool, you can get the - corresponding user-mode sources with + corresponding user-mode sources with:: host% cvs co -r v_2_3_x linux @@ -322,10 +305,11 @@ bug fixes and enhancements that have gone into subsequent releases. - 2.2. Compiling and installing kernel modules +2.2. Compiling and installing kernel modules +--------------------------------------------- UML modules are built in the same way as the native kernel (with the - exception of the 'ARCH=um' that you always need for UML): + exception of the 'ARCH=um' that you always need for UML):: host% make modules ARCH=um @@ -337,12 +321,12 @@ the user-mode pool. Modules from the native kernel won't work. You can install them by using ftp or something to copy them into the - virtual machine and dropping them into /lib/modules/`uname -r`. + virtual machine and dropping them into ``/lib/modules/$(uname -r)``. You can also get the kernel build process to install them as follows: 1. with the kernel not booted, mount the root filesystem in the top - level of the kernel pool: + level of the kernel pool:: host% mount root_fs mnt -o loop @@ -352,7 +336,7 @@ - 2. run + 2. run:: host% @@ -363,7 +347,7 @@ - 3. unmount the filesystem + 3. unmount the filesystem:: host% umount mnt @@ -386,22 +370,23 @@ - 2.3. Compiling and installing uml_utilities +2.3. Compiling and installing uml_utilities +-------------------------------------------- Many features of the UML kernel require a user-space helper program, so a uml_utilities package is distributed separately from the kernel patch which provides these helpers. Included within this is: - o port-helper - Used by consoles which connect to xterms or ports + - port-helper - Used by consoles which connect to xterms or ports - o tunctl - Configuration tool to create and delete tap devices + - tunctl - Configuration tool to create and delete tap devices - o uml_net - Setuid binary for automatic tap device configuration + - uml_net - Setuid binary for automatic tap device configuration - o uml_switch - User-space virtual switch required for daemon + - uml_switch - User-space virtual switch required for daemon transport - The uml_utilities tree is compiled with: + The uml_utilities tree is compiled with:: host# @@ -423,19 +408,21 @@ - 3. Running UML and logging in +3. Running UML and logging in +============================== - 3.1. Running UML +3.1. Running UML +----------------- It runs on 2.2.15 or later, and all 2.4 kernels. Booting UML is straightforward. Simply run 'linux': it will try to - mount the file `root_fs' in the current directory. You do not need to - run it as root. If your root filesystem is not named `root_fs', then - you need to put a `ubd0=root_fs_whatever' switch on the linux command + mount the file ``root_fs`` in the current directory. You do not need to + run it as root. If your root filesystem is not named ``root_fs``, then + you need to put a ``ubd0=root_fs_whatever`` switch on the linux command line. @@ -447,14 +434,16 @@ The kernel will boot up and present you with a login prompt. - Note: If the host is configured with a 2G/2G address space split +Note: + If the host is configured with a 2G/2G address space split rather than the usual 3G/1G split, then the packaged UML binaries will - not run. They will immediately segfault. See ``UML on 2G/2G hosts'' + not run. They will immediately segfault. See :ref:`UML_on_2G/2G_hosts` for the scoop on running UML on your system. - 3.2. Logging in +3.2. Logging in +---------------- @@ -468,22 +457,22 @@ There are a couple of other ways to log in: - o On a virtual console + - On a virtual console Each virtual console that is configured (i.e. the device exists in /dev and /etc/inittab runs a getty on it) will come up in its own - xterm. If you get tired of the xterms, read ``Setting up serial - lines and consoles'' to see how to attach the consoles to - something else, like host ptys. + xterm. If you get tired of the xterms, read + :ref:`setting_up_serial_lines_and_consoles` to see how to attach + the consoles to something else, like host ptys. - o Over the serial line + - Over the serial line - In the boot output, find a line that looks like: + In the boot output, find a line that looks like:: @@ -493,7 +482,7 @@ Attach your favorite terminal program to the corresponding tty. I.e. - for minicom, the command would be + for minicom, the command would be:: host% minicom -o -p /dev/ttyp1 @@ -503,37 +492,41 @@ - o Over the net + - Over the net If the network is running, then you can telnet to the virtual - machine and log in to it. See ``Setting up the network'' to learn + machine and log in to it. See :ref:`Setting_up_the_network` to learn about setting up a virtual network. When you're done using it, run halt, and the kernel will bring itself down and the process will exit. - 3.3. Examples +3.3. Examples +-------------- Here are some examples of UML in action: - o A login session + - A login session - o A virtual network + - A virtual network +.. _UML_on_2G/2G_hosts: - 4. UML on 2G/2G hosts +4. UML on 2G/2G hosts +====================== - 4.1. Introduction +4.1. Introduction +------------------ Most Linux machines are configured so that the kernel occupies the @@ -546,7 +539,8 @@ - 4.2. The problem +4.2. The problem +----------------- The prebuilt UML binaries on this site will not run on 2G/2G hosts @@ -558,13 +552,14 @@ - 4.3. The solution +4.3. The solution +------------------ The fix for this is to rebuild UML from source after enabling CONFIG_HOST_2G_2G (under 'General Setup'). This will cause UML to load itself in the top .5G of that smaller process address space, - where it will run fine. See ``Compiling the kernel and modules'' if + where it will run fine. See :ref:`Compiling_the_kernel_and_modules` if you need help building UML from source. @@ -573,10 +568,11 @@ +.. _setting_up_serial_lines_and_consoles: - - 5. Setting up serial lines and consoles +5. Setting up serial lines and consoles +======================================== It is possible to attach UML serial lines and consoles to many types @@ -584,22 +580,23 @@ You can attach them to host ptys, ttys, file descriptors, and ports. - This allows you to do things like + This allows you to do things like: - o have a UML console appear on an unused host console, + - have a UML console appear on an unused host console, - o hook two virtual machines together by having one attach to a pty + - hook two virtual machines together by having one attach to a pty and having the other attach to the corresponding tty - o make a virtual machine accessible from the net by attaching a + - make a virtual machine accessible from the net by attaching a console to a port on the host. - The general format of the command line option is device=channel. + The general format of the command line option is ``device=channel``. - 5.1. Specifying the device +5.1. Specifying the device +--------------------------- Devices are specified with "con" or "ssl" (console or serial line, respectively), optionally with a device number if you are talking @@ -613,7 +610,7 @@ A specific device name will override a less general "con=" or "ssl=". So, for example, you can assign a pty to each of the serial lines - except for the first two like this: + except for the first two like this:: ssl=pty ssl0=tty:/dev/tty0 ssl1=tty:/dev/tty1 @@ -626,13 +623,14 @@ - 5.2. Specifying the channel +5.2. Specifying the channel +---------------------------- There are a number of different types of channels to attach a UML device to, each with a different way of specifying exactly what to attach to. - o pseudo-terminals - device=pty pts terminals - device=pts + - pseudo-terminals - device=pty pts terminals - device=pts This will cause UML to allocate a free host pseudo-terminal for the @@ -640,23 +638,23 @@ log. You access it by attaching a terminal program to the corresponding tty: - o screen /dev/pts/n + - screen /dev/pts/n - o screen /dev/ttyxx + - screen /dev/ttyxx - o minicom -o -p /dev/ttyxx - minicom seems not able to handle pts + - minicom -o -p /dev/ttyxx - minicom seems not able to handle pts devices - o kermit - start it up, 'open' the device, then 'connect' + - kermit - start it up, 'open' the device, then 'connect' - o terminals - device=tty:tty device file + - terminals - device=tty:tty device file - This will make UML attach the device to the specified tty (i.e + This will make UML attach the device to the specified tty (i.e:: con1=tty:/dev/tty3 @@ -672,7 +670,7 @@ - o xterms - device=xterm + - xterms - device=xterm UML will run an xterm and the device will be attached to it. @@ -681,12 +679,12 @@ - o Port - device=port:port number + - Port - device=port:port number This will attach the UML devices to the specified host port. Attaching console 1 to the host's port 9000 would be done like - this: + this:: con1=port:9000 @@ -694,7 +692,7 @@ - Attaching all the serial lines to that port would be done similarly: + Attaching all the serial lines to that port would be done similarly:: ssl=port:9000 @@ -702,8 +700,8 @@ - You access these devices by telnetting to that port. Each active tel- - net session gets a different device. If there are more telnets to a + You access these devices by telnetting to that port. Each active + telnet session gets a different device. If there are more telnets to a port than UML devices attached to it, then the extra telnet sessions will block until an existing telnet detaches, or until another device becomes active (i.e. by being activated in /etc/inittab). @@ -725,13 +723,13 @@ - o already-existing file descriptors - device=file descriptor + - already-existing file descriptors - device=file descriptor If you set up a file descriptor on the UML command line, you can attach a UML device to it. This is most commonly used to put the main console back on stdin and stdout after assigning all the other - consoles to something else: + consoles to something else:: con0=fd:0,fd:1 con=pts @@ -743,7 +741,7 @@ - o Nothing - device=null + - Nothing - device=null This allows the device to be opened, in contrast to 'none', but @@ -754,7 +752,7 @@ - o None - device=none + - None - device=none This causes the device to disappear. @@ -762,7 +760,7 @@ You can also specify different input and output channels for a device - by putting a comma between them: + by putting a comma between them:: ssl3=tty:/dev/tty2,xterm @@ -785,14 +783,15 @@ - 5.3. Examples +5.3. Examples +-------------- There are a number of interesting things you can do with this capability. First, this is how you get rid of those bleeding console xterms by - attaching them to host ptys: + attaching them to host ptys:: con=pty con0=fd:0,fd:1 @@ -802,7 +801,7 @@ This will make a UML console take over an unused host virtual console, so that when you switch to it, you will see the UML login prompt - rather than the host login prompt: + rather than the host login prompt:: con1=tty:/dev/tty6 @@ -813,7 +812,7 @@ You can attach two virtual machines together with what amounts to a serial line as follows: - Run one UML with a serial line attached to a pty - + Run one UML with a serial line attached to a pty:: ssl1=pty @@ -825,7 +824,7 @@ that it got /dev/ptyp1). Boot the other UML with a serial line attached to the corresponding - tty - + tty:: ssl1=tty:/dev/ttyp1 @@ -838,7 +837,10 @@ prompt of the other virtual machine. - 6. Setting up the network +.. _setting_up_the_network: + +6. Setting up the network +========================== @@ -858,19 +860,19 @@ There are currently five transport types available for a UML virtual machine to exchange packets with other hosts: - o ethertap + - ethertap - o TUN/TAP + - TUN/TAP - o Multicast + - Multicast - o a switch daemon + - a switch daemon - o slip + - slip - o slirp + - slirp - o pcap + - pcap The TUN/TAP, ethertap, slip, and slirp transports allow a UML instance to exchange packets with the host. They may be directed @@ -893,28 +895,28 @@ With so many host transports, which one should you use? Here's when you should use each one: - o ethertap - if you want access to the host networking and it is + - ethertap - if you want access to the host networking and it is running 2.2 - o TUN/TAP - if you want access to the host networking and it is + - TUN/TAP - if you want access to the host networking and it is running 2.4. Also, the TUN/TAP transport is able to use a preconfigured device, allowing it to avoid using the setuid uml_net helper, which is a security advantage. - o Multicast - if you want a purely virtual network and you don't want + - Multicast - if you want a purely virtual network and you don't want to set up anything but the UML - o a switch daemon - if you want a purely virtual network and you + - a switch daemon - if you want a purely virtual network and you don't mind running the daemon in order to get somewhat better performance - o slip - there is no particular reason to run the slip backend unless + - slip - there is no particular reason to run the slip backend unless ethertap and TUN/TAP are just not available for some reason - o slirp - if you don't have root access on the host to setup + - slirp - if you don't have root access on the host to setup networking, or if you don't want to allocate an IP to your UML - o pcap - not much use for actual network connectivity, but great for + - pcap - not much use for actual network connectivity, but great for monitoring traffic on the host Ethertap is available on 2.4 and works fine. TUN/TAP is preferred @@ -926,7 +928,8 @@ exploit the helper's root privileges. - 6.1. General setup +6.1. General setup +------------------- First, you must have the virtual network enabled in your UML. If are running a prebuilt kernel from this site, everything is already @@ -938,7 +941,7 @@ The next step is to provide a network device to the virtual machine. This is done by describing it on the kernel command line. - The general format is + The general format is:: eth = , @@ -947,7 +950,7 @@ For example, a virtual ethernet device may be attached to a host - ethertap device as follows: + ethertap device as follows:: eth0=ethertap,tap0,fe:fd:0:0:0:1,192.168.0.254 @@ -978,7 +981,7 @@ You can also add devices to a UML and remove them at runtime. See the - ``The Management Console'' page for details. + :ref:`The_Management_Console` page for details. The sections below describe this in more detail. @@ -995,7 +998,8 @@ - 6.2. Userspace daemons +6.2. Userspace daemons +----------------------- You will likely need the setuid helper, or the switch daemon, or both. They are both installed with the RPM and deb, so if you've installed @@ -1011,7 +1015,8 @@ - 6.3. Specifying ethernet addresses +6.3. Specifying ethernet addresses +----------------------------------- Below, you will see that the TUN/TAP, ethertap, and daemon interfaces allow you to specify hardware addresses for the virtual ethernet @@ -1023,21 +1028,21 @@ sufficient to guarantee a unique hardware address for the device. A couple of exceptions are: - o Another set of virtual ethernet devices are on the same network and + - Another set of virtual ethernet devices are on the same network and they are assigned hardware addresses using a different scheme which may conflict with the UML IP address-based scheme - o You aren't going to use the device for IP networking, so you don't + - You aren't going to use the device for IP networking, so you don't assign the device an IP address If you let the driver provide the hardware address, you should make sure that the device IP address is known before the interface is - brought up. So, inside UML, this will guarantee that: + brought up. So, inside UML, this will guarantee that:: - UML# - ifconfig eth0 192.168.0.250 up + UML# + ifconfig eth0 192.168.0.250 up @@ -1049,13 +1054,14 @@ - 6.4. UML interface setup +6.4. UML interface setup +------------------------- Once the network devices have been described on the command line, you should boot UML and log in. - The first thing to do is bring the interface up: + The first thing to do is bring the interface up:: UML# ifconfig ethn ip-address up @@ -1067,7 +1073,7 @@ To reach the rest of the world, you should set a default route to the - host: + host:: UML# route add default gw host ip @@ -1075,7 +1081,7 @@ - Again, with host ip of 192.168.0.4: + Again, with host ip of 192.168.0.4:: UML# route add default gw 192.168.0.4 @@ -1097,29 +1103,25 @@ Note: If you can't communicate with other hosts on your physical ethernet, it's probably because of a network route that's automatically set up. If you run 'route -n' and see a route that - looks like this: + looks like this:: - Destination Gateway Genmask Flags Metric Ref Use Iface - 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 + Destination Gateway Genmask Flags Metric Ref Use Iface + 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 with a mask that's not 255.255.255.255, then replace it with a route - to your host: + to your host:: UML# route del -net 192.168.0.0 dev eth0 netmask 255.255.255.0 - - - - UML# route add -host 192.168.0.4 dev eth0 @@ -1131,7 +1133,8 @@ - 6.5. Multicast +6.5. Multicast +--------------- The simplest way to set up a virtual network between multiple UMLs is to use the mcast transport. This was written by Harald Welte and is @@ -1142,7 +1145,7 @@ messages when you bring the device up inside UML. - To use it, run two UMLs with + To use it, run two UMLs with:: eth0=mcast @@ -1151,16 +1154,12 @@ on their command lines. Log in, configure the ethernet device in each - machine with different IP addresses: + machine with different IP addresses:: UML1# ifconfig eth0 192.168.0.254 - - - - UML2# ifconfig eth0 192.168.0.253 @@ -1168,7 +1167,7 @@ and they should be able to talk to each other. - The full set of command line options for this transport are + The full set of command line options for this transport are:: @@ -1186,7 +1185,7 @@ This is useful when your network does not support multicast, and all network connections are simple point to point links. - The full set of command line options for this transport are + The full set of command line options for this transport are:: ethn=ucast,ethernet address,remote address,listen port,remote port @@ -1194,7 +1193,8 @@ - 6.6. TUN/TAP with the uml_net helper +6.6. TUN/TAP with the uml_net helper +------------------------------------- TUN/TAP is the preferred mechanism on 2.4 to exchange packets with the host. The TUN/TAP backend has been in UML since 2.4.9-3um. @@ -1216,7 +1216,7 @@ kernel or as the tun.o module. The format of the command line switch to attach a device to a TUN/TAP - device is + device is:: eth =tuntap,,, @@ -1226,7 +1226,7 @@ For example, this argument will attach the UML's eth0 to the next available tap device and assign an ethernet address to it based on its - IP address + IP address:: eth0=tuntap,,,192.168.0.254 @@ -1247,10 +1247,10 @@ There are a couple potential problems with running the TUN/TAP transport on a 2.4 host kernel - o TUN/TAP seems not to work on 2.4.3 and earlier. Upgrade the host + - TUN/TAP seems not to work on 2.4.3 and earlier. Upgrade the host kernel or use the ethertap transport. - o With an upgraded kernel, TUN/TAP may fail with + - With an upgraded kernel, TUN/TAP may fail with:: File descriptor in bad state @@ -1264,12 +1264,12 @@ kernel. These were pointed out by Tim Robinson in - name="this uml- - user post"> . + name="this uml-user post"> . - 6.7. TUN/TAP with a preconfigured tap device +6.7. TUN/TAP with a preconfigured tap device +--------------------------------------------- If you prefer not to have UML use uml_net (which is somewhat insecure), with UML 2.4.17-11, you can set up a TUN/TAP device @@ -1277,8 +1277,8 @@ there is no need for root assistance. Setting up the device is done as follows: - o Create the device with tunctl (available from the UML utilities - tarball) + - Create the device with tunctl (available from the UML utilities + tarball):: @@ -1291,8 +1291,8 @@ where uid is the user id or username that UML will be run as. This will tell you what device was created. - o Configure the device IP (change IP addresses and device name to - suit) + - Configure the device IP (change IP addresses and device name to + suit):: @@ -1303,8 +1303,8 @@ - o Set up routing and arping if desired - this is my recipe, there are - other ways of doing the same thing + - Set up routing and arping if desired - this is my recipe, there are + other ways of doing the same thing:: host# @@ -1313,19 +1313,9 @@ host# route add -host 192.168.0.253 dev tap0 - - - - - host# bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp' - - - - - host# arp -Ds 192.168.0.253 eth0 pub @@ -1338,76 +1328,43 @@ utility which reads the information from a config file and sets up devices at boot time. - o Rather than using up two IPs and ARPing for one of them, you can + - Rather than using up two IPs and ARPing for one of them, you can also provide direct access to your LAN by the UML by using a - bridge. + bridge:: host# brctl addbr br0 - - - - host# ifconfig eth0 0.0.0.0 promisc up - - - - host# ifconfig tap0 0.0.0.0 promisc up - - - - host# ifconfig br0 192.168.0.1 netmask 255.255.255.0 up - - - - - - host# - brctl stp br0 off - - - - + host# + brctl stp br0 off host# brctl setfd br0 1 - - - - host# brctl sethello br0 1 - - - - host# brctl addif br0 eth0 - - - - host# brctl addif br0 tap0 @@ -1417,12 +1374,12 @@ Note that 'br0' should be setup using ifconfig with the existing IP address of eth0, as eth0 no longer has its own IP. - o + - Also, the /dev/net/tun device must be writable by the user running UML in order for the UML to use the device that's been configured - for it. The simplest thing to do is + for it. The simplest thing to do is:: host# chmod 666 /dev/net/tun @@ -1438,14 +1395,14 @@ devices and chgrp /dev/net/tun to that group with mode 664 or 660. - o Once the device is set up, run UML with 'eth0=tuntap,device name' + - Once the device is set up, run UML with 'eth0=tuntap,device name' (i.e. 'eth0=tuntap,tap0') on the command line (or do it with the mconsole config command). - o Bring the eth device up in UML and you're in business. + - Bring the eth device up in UML and you're in business. If you don't want that tap device any more, you can make it non- - persistent with + persistent with:: host# tunctl -d tap device @@ -1455,7 +1412,7 @@ Finally, tunctl has a -b (for brief mode) switch which causes it to output only the name of the tap device it created. This makes it - suitable for capture by a script: + suitable for capture by a script:: host# TAP=`tunctl -u 1000 -b` @@ -1465,7 +1422,8 @@ - 6.8. Ethertap +6.8. Ethertap +-------------- Ethertap is the general mechanism on 2.2 for userspace processes to exchange packets with the kernel. @@ -1473,7 +1431,7 @@ To use this transport, you need to describe the virtual network device - on the UML command line. The general format for this is + on the UML command line. The general format for this is:: eth =ethertap, , , @@ -1481,7 +1439,7 @@ - So, the previous example + So, the previous example:: eth0=ethertap,tap0,fe:fd:0:0:0:1,192.168.0.254 @@ -1521,7 +1479,7 @@ If you want to set things up yourself, you need to make sure that the appropriate /dev entry exists. If it doesn't, become root and create - it as follows: + it as follows:: mknod /dev/tap c 36 + 16 @@ -1529,7 +1487,7 @@ - For example, this is how to create /dev/tap0: + For example, this is how to create /dev/tap0:: mknod /dev/tap0 c 36 0 + 16 @@ -1539,7 +1497,7 @@ You also need to make sure that the host kernel has ethertap support. If ethertap is enabled as a module, you apparently need to insmod - ethertap once for each ethertap device you want to enable. So, + ethertap once for each ethertap device you want to enable. So,:: host# @@ -1549,7 +1507,7 @@ will give you the tap0 interface. To get the tap1 interface, you need - to run + to run:: host# @@ -1561,7 +1519,8 @@ - 6.9. The switch daemon +6.9. The switch daemon +----------------------- Note: This is the daemon formerly known as uml_router, but which was renamed so the network weenies of the world would stop growling at me. @@ -1577,7 +1536,7 @@ sockets. - If you want it to listen on a different pair of sockets, use + If you want it to listen on a different pair of sockets, use:: -unix control socket data socket @@ -1586,7 +1545,7 @@ - If you want it to act as a hub rather than a switch, use + If you want it to act as a hub rather than a switch, use:: -hub @@ -1596,7 +1555,7 @@ If you want the switch to be connected to host networking (allowing - the umls to get access to the outside world through the host), use + the umls to get access to the outside world through the host), use:: -tap tap0 @@ -1610,7 +1569,7 @@ device than tap0, specify that instead of tap0. - uml_switch can be backgrounded as follows + uml_switch can be backgrounded as follows:: host% @@ -1623,7 +1582,7 @@ stdin for EOF. When it sees that, it exits. - The general format of the kernel command line switch is + The general format of the kernel command line switch is:: @@ -1639,7 +1598,8 @@ how to communicate with the daemon. You should only specify them if you told the daemon to use different sockets than the default. So, if you ran the daemon with no arguments, running the UML on the same - machine with + machine with:: + eth0=daemon @@ -1649,7 +1609,8 @@ - 6.10. Slip +6.10. Slip +----------- Slip is another, less general, mechanism for a process to communicate with the host networking. In contrast to the ethertap interface, @@ -1658,7 +1619,7 @@ IP. - The general format of the command line switch is + The general format of the command line switch is:: @@ -1681,7 +1642,8 @@ - 6.11. Slirp +6.11. Slirp +------------ slirp uses an external program, usually /usr/bin/slirp, to provide IP only networking connectivity through the host. This is similar to IP @@ -1691,7 +1653,7 @@ root access or setuid binaries on the host. - The general format of the command line switch for slirp is: + The general format of the command line switch for slirp is:: @@ -1716,7 +1678,7 @@ The eth0 interface on UML should be set up with the IP 10.2.0.15, although you can use anything as long as it is not used by a network you will be connecting to. The default route on UML should be set to - use + use:: UML# @@ -1737,10 +1699,11 @@ - 6.12. pcap +6.12. pcap +----------- The pcap transport is attached to a UML ethernet device on the command - line or with uml_mconsole with the following syntax: + line or with uml_mconsole with the following syntax:: @@ -1762,7 +1725,7 @@ expression optimizer is used. - Example: + Example:: @@ -1777,7 +1740,8 @@ - 6.13. Setting up the host yourself +6.13. Setting up the host yourself +----------------------------------- If you don't specify an address for the host side of the ethertap or slip device, UML won't do any setup on the host. So this is what is @@ -1785,19 +1749,15 @@ 192.168.0.251 and a UML-side IP of 192.168.0.250 - adjust to suit your own network): - o The device needs to be configured with its IP address. Tap devices + - The device needs to be configured with its IP address. Tap devices are also configured with an mtu of 1484. Slip devices are configured with a point-to-point address pointing at the UML ip - address. + address:: host# ifconfig tap0 arp mtu 1484 192.168.0.251 up - - - - host# ifconfig sl0 192.168.0.251 pointopoint 192.168.0.250 up @@ -1805,7 +1765,7 @@ - o If a tap device is being set up, a route is set to the UML IP. + - If a tap device is being set up, a route is set to the UML IP:: UML# route add -host 192.168.0.250 gw 192.168.0.251 @@ -1814,8 +1774,8 @@ - o To allow other hosts on your network to see the virtual machine, - proxy arp is set up for it. + - To allow other hosts on your network to see the virtual machine, + proxy arp is set up for it:: host# arp -Ds 192.168.0.250 eth0 pub @@ -1824,7 +1784,7 @@ - o Finally, the host is set up to route packets. + - Finally, the host is set up to route packets:: host# echo 1 > /proc/sys/net/ipv4/ip_forward @@ -1838,12 +1798,14 @@ - 7. Sharing Filesystems between Virtual Machines +7. Sharing Filesystems between Virtual Machines +================================================ - 7.1. A warning +7.1. A warning +--------------- Don't attempt to share filesystems simply by booting two UMLs from the same file. That's the same thing as booting two physical machines @@ -1851,7 +1813,8 @@ - 7.2. Using layered block devices +7.2. Using layered block devices +--------------------------------- The way to share a filesystem between two virtual machines is to use the copy-on-write (COW) layering capability of the ubd block driver. @@ -1872,7 +1835,7 @@ To add a copy-on-write layer to an existing block device file, simply - add the name of the COW file to the appropriate ubd switch: + add the name of the COW file to the appropriate ubd switch:: ubd0=root_fs_cow,root_fs_debian_22 @@ -1883,7 +1846,7 @@ where 'root_fs_cow' is the private COW file and 'root_fs_debian_22' is the existing shared filesystem. The COW file need not exist. If it doesn't, the driver will create and initialize it. Once the COW file - has been initialized, it can be used on its own on the command line: + has been initialized, it can be used on its own on the command line:: ubd0=root_fs_cow @@ -1896,14 +1859,16 @@ - 7.3. Note! +7.3. Note! +----------- When checking the size of the COW file in order to see the gobs of space that you're saving, make sure you use 'ls -ls' to see the actual disk consumption rather than the length of the file. The COW file is sparse, so the length will be very different from the disk usage. Here is a 'ls -l' of a COW file and backing file from one boot and - shutdown: + shutdown:: + host% ls -l cow.debian debian2.2 -rw-r--r-- 1 jdike jdike 492504064 Aug 6 21:16 cow.debian -rwxrw-rw- 1 jdike jdike 537919488 Aug 6 20:42 debian2.2 @@ -1911,7 +1876,7 @@ - Doesn't look like much saved space, does it? Well, here's 'ls -ls': + Doesn't look like much saved space, does it? Well, here's 'ls -ls':: host% ls -ls cow.debian debian2.2 @@ -1926,7 +1891,8 @@ - 7.4. Another warning +7.4. Another warning +--------------------- Once a filesystem is being used as a readonly backing file for a COW file, do not boot directly from it or modify it in any way. Doing so @@ -1952,7 +1918,8 @@ - 7.5. uml_moo : Merging a COW file with its backing file +7.5. uml_moo : Merging a COW file with its backing file +-------------------------------------------------------- Depending on how you use UML and COW devices, it may be advisable to merge the changes in the COW file into the backing file every once in @@ -1961,7 +1928,7 @@ - The utility that does this is uml_moo. Its usage is + The utility that does this is uml_moo. Its usage is:: host% uml_moo COW file new backing file @@ -2001,7 +1968,8 @@ - 8. Creating filesystems +8. Creating filesystems +======================== You may want to create and mount new UML filesystems, either because @@ -2015,13 +1983,14 @@ should be easy to translate to the filesystem of your choice. - 8.1. Create the filesystem file +8.1. Create the filesystem file +================================ dd is your friend. All you need to do is tell dd to create an empty file of the appropriate size. I usually make it sparse to save time and to avoid allocating disk space until it's actually used. For example, the following command will create a sparse 100 meg file full - of zeroes. + of zeroes:: host% @@ -2034,9 +2003,9 @@ 8.2. Assign the file to a UML device - Add an argument like the following to the UML command line: + Add an argument like the following to the UML command line:: - ubd4=new_filesystem + ubd4=new_filesystem @@ -2053,7 +2022,7 @@ etc), then get them into UML by way of the net or hostfs. - Make the new filesystem on the device assigned to the new file: + Make the new filesystem on the device assigned to the new file:: host# mkreiserfs /dev/ubd/4 @@ -2077,7 +2046,7 @@ - Now, mount it: + Now, mount it:: UML# @@ -2096,7 +2065,8 @@ - 9. Host file access +9. Host file access +==================== If you want to access files on the host machine from inside UML, you @@ -2112,10 +2082,11 @@ files contained in it just as you would on the host. - 9.1. Using hostfs +9.1. Using hostfs +------------------ To begin with, make sure that hostfs is available inside the virtual - machine with + machine with:: UML# cat /proc/filesystems @@ -2127,7 +2098,7 @@ module and available inside the virtual machine, and insmod it. - Now all you need to do is run mount: + Now all you need to do is run mount:: UML# mount none /mnt/host -t hostfs @@ -2139,7 +2110,7 @@ If you don't want to mount the host root directory, then you can - specify a subdirectory to mount with the -o switch to mount: + specify a subdirectory to mount with the -o switch to mount:: UML# mount none /mnt/home -t hostfs -o /home @@ -2151,13 +2122,14 @@ - 9.2. hostfs as the root filesystem +9.2. hostfs as the root filesystem +----------------------------------- It's possible to boot from a directory hierarchy on the host using hostfs rather than using the standard filesystem in a file. To start, you need that hierarchy. The easiest way is to loop mount - an existing root_fs file: + an existing root_fs file:: host# mount root_fs uml_root_dir -o loop @@ -2166,15 +2138,15 @@ You need to change the filesystem type of / in etc/fstab to be - 'hostfs', so that line looks like this: + 'hostfs', so that line looks like this:: - /dev/ubd/0 / hostfs defaults 1 1 + /dev/ubd/0 / hostfs defaults 1 1 Then you need to chown to yourself all the files in that directory - that are owned by root. This worked for me: + that are owned by root. This worked for me:: host# find . -uid 0 -exec chown jdike {} \; @@ -2183,7 +2155,7 @@ Next, make sure that your UML kernel has hostfs compiled in, not as a - module. Then run UML with the boot device pointing at that directory: + module. Then run UML with the boot device pointing at that directory:: ubd0=/path/to/uml/root/directory @@ -2194,41 +2166,35 @@ UML should then boot as it does normally. - 9.3. Building hostfs +9.3. Building hostfs +--------------------- If you need to build hostfs because it's not in your kernel, you have two choices: - o Compiling hostfs into the kernel: + - Compiling hostfs into the kernel: Reconfigure the kernel and set the 'Host filesystem' option under - o Compiling hostfs as a module: + - Compiling hostfs as a module: Reconfigure the kernel and set the 'Host filesystem' option under be in arch/um/fs/hostfs/hostfs.o. Install that in - /lib/modules/`uname -r`/fs in the virtual machine, boot it up, and + ``/lib/modules/$(uname -r)/fs`` in the virtual machine, boot it up, and:: UML# insmod hostfs +.. _The_Management_Console: - - - - - - - - - - 10. The Management Console +10. The Management Console +=========================== @@ -2240,15 +2206,15 @@ There are a number of things you can do with the mconsole interface: - o get the kernel version + - get the kernel version - o add and remove devices + - add and remove devices - o halt or reboot the machine + - halt or reboot the machine - o Send SysRq commands + - Send SysRq commands - o Pause and resume the UML + - Pause and resume the UML You need the mconsole client (uml_mconsole) which is present in CVS @@ -2257,7 +2223,7 @@ You also need CONFIG_MCONSOLE (under 'General Setup') enabled in UML. - When you boot UML, you'll see a line like: + When you boot UML, you'll see a line like:: mconsole initialized on /home/jdike/.uml/umlNJ32yL/mconsole @@ -2265,7 +2231,7 @@ - If you specify a unique machine id one the UML command line, i.e. + If you specify a unique machine id one the UML command line, i.e.:: umid=debian @@ -2273,7 +2239,7 @@ - you'll see this + you'll see this:: mconsole initialized on /home/jdike/.uml/debian/mconsole @@ -2282,7 +2248,7 @@ That file is the socket that uml_mconsole will use to communicate with - UML. Run it with either the umid or the full path as its argument: + UML. Run it with either the umid or the full path as its argument:: host% uml_mconsole debian @@ -2290,7 +2256,7 @@ - or + or:: host% uml_mconsole /home/jdike/.uml/debian/mconsole @@ -2300,30 +2266,31 @@ You'll get a prompt, at which you can run one of these commands: - o version + - version - o halt + - halt - o reboot + - reboot - o config + - config - o remove + - remove - o sysrq + - sysrq - o help + - help - o cad + - cad - o stop + - stop - o go + - go - 10.1. version +10.1. version +-------------- - This takes no arguments. It prints the UML version. + This takes no arguments. It prints the UML version:: (mconsole) version @@ -2342,11 +2309,12 @@ - 10.2. halt and reboot +10.2. halt and reboot +---------------------- These take no arguments. They shut the machine down immediately, with no syncing of disks and no clean shutdown of userspace. So, they are - pretty close to crashing the machine. + pretty close to crashing the machine:: (mconsole) halt @@ -2357,34 +2325,36 @@ - 10.3. config +10.3. config +------------- "config" adds a new device to the virtual machine. Currently the ubd and network drivers support this. It takes one argument, which is the - device to add, with the same syntax as the kernel command line. + device to add, with the same syntax as the kernel command line:: - (mconsole) - config ubd3=/home/jdike/incoming/roots/root_fs_debian22 + (mconsole) + config ubd3=/home/jdike/incoming/roots/root_fs_debian22 - OK - (mconsole) config eth1=mcast - OK + OK + (mconsole) config eth1=mcast + OK - 10.4. remove +10.4. remove +------------- "remove" deletes a device from the system. Its argument is just the name of the device to be removed. The device must be idle in whatever sense the driver considers necessary. In the case of the ubd driver, the removed block device must not be mounted, swapped on, or otherwise - open, and in the case of the network driver, the device must be down. + open, and in the case of the network driver, the device must be down:: (mconsole) remove ubd3 @@ -2397,7 +2367,8 @@ - 10.5. sysrq +10.5. sysrq +------------ This takes one argument, which is a single letter. It calls the generic kernel's SysRq driver, which does whatever is called for by @@ -2407,19 +2378,21 @@ - 10.6. help +10.6. help +----------- "help" returns a string listing the valid commands and what each one does. - 10.7. cad +10.7. cad +---------- This invokes the Ctl-Alt-Del action on init. What exactly this ends up doing is up to /etc/inittab. Normally, it reboots the machine. With UML, this is usually not desired, so if a halt would be better, - then find the section of inittab that looks like this + then find the section of inittab that looks like this:: # What to do when CTRL-ALT-DEL is pressed. @@ -2432,7 +2405,8 @@ - 10.8. stop +10.8. stop +----------- This puts the UML in a loop reading mconsole requests until a 'go' mconsole command is received. This is very useful for making backups @@ -2448,7 +2422,8 @@ - 10.9. go +10.9. go +--------- This resumes a UML after being paused by a 'stop' command. Note that when the UML has resumed, TCP connections may have timed out and if @@ -2460,9 +2435,10 @@ +.. _Kernel_debugging: - - 11. Kernel debugging +11. Kernel debugging +===================== Note: The interface that makes debugging, as described here, possible @@ -2477,15 +2453,16 @@ In order to debug the kernel, you need build it from source. See - ``Compiling the kernel and modules'' for information on doing that. + :ref:`Compiling_the_kernel_and_modules` for information on doing that. Make sure that you enable CONFIG_DEBUGSYM and CONFIG_PT_PROXY during - the config. These will compile the kernel with -g, and enable the + the config. These will compile the kernel with ``-g``, and enable the ptrace proxy so that gdb works with UML, respectively. - 11.1. Starting the kernel under gdb +11.1. Starting the kernel under gdb +------------------------------------ You can have the kernel running under the control of gdb from the beginning by putting 'debug' on the command line. You will get an @@ -2498,7 +2475,11 @@ There is a transcript of a debugging session here , with breakpoints being set in the scheduler and in an interrupt handler. - 11.2. Examining sleeping processes + + +11.2. Examining sleeping processes +----------------------------------- + Not every bug is evident in the currently running process. Sometimes, processes hang in the kernel when they shouldn't because they've @@ -2516,7 +2497,7 @@ Now what you do is this: - o detach from the current thread + - detach from the current thread:: (UML gdb) det @@ -2525,7 +2506,7 @@ - o attach to the thread you are interested in + - attach to the thread you are interested in:: (UML gdb) att @@ -2534,7 +2515,7 @@ - o look at its stack and anything else of interest + - look at its stack and anything else of interest:: (UML gdb) bt @@ -2545,18 +2526,14 @@ Note that you can't do anything at this point that requires that a process execute, e.g. calling a function - o when you're done looking at that process, reattach to the current - thread and continue it + - when you're done looking at that process, reattach to the current + thread and continue it:: (UML gdb) att 1 - - - - (UML gdb) c @@ -2569,12 +2546,13 @@ - 11.3. Running ddd on UML +11.3. Running ddd on UML +------------------------- ddd works on UML, but requires a special kludge. The process goes like this: - o Start ddd + - Start ddd:: host% ddd linux @@ -2583,14 +2561,14 @@ - o With ps, get the pid of the gdb that ddd started. You can ask the + - With ps, get the pid of the gdb that ddd started. You can ask the gdb to tell you, but for some reason that confuses things and causes a hang. - o run UML with 'debug=parent gdb-pid=' added to the command line + - run UML with 'debug=parent gdb-pid=' added to the command line - it will just sit there after you hit return - o type 'att 1' to the ddd gdb and you will see something like + - type 'att 1' to the ddd gdb and you will see something like:: 0xa013dc51 in __kill () @@ -2602,12 +2580,14 @@ - o At this point, type 'c', UML will boot up, and you can use ddd just + - At this point, type 'c', UML will boot up, and you can use ddd just as you do on any other process. - 11.4. Debugging modules +11.4. Debugging modules +------------------------ + gdb has support for debugging code which is dynamically loaded into the process. This support is what is needed to debug kernel modules @@ -2629,7 +2609,8 @@ First, you must tell it where your modules are. There is a list in - the script that looks like this: + the script that looks like this:: + set MODULE_PATHS { "fat" "/usr/src/uml/linux-2.4.18/fs/fat/fat.o" "isofs" "/usr/src/uml/linux-2.4.18/fs/isofs/isofs.o" @@ -2641,9 +2622,7 @@ You change that to list the names and paths of the modules that you are going to debug. Then you run it from the toplevel directory of - your UML pool and it basically tells you what to do: - - + your UML pool and it basically tells you what to do:: ******** GDB pid is 21903 ******** @@ -2666,7 +2645,7 @@ After you run UML and it sits there doing nothing, you hit return at - the 'att 1' and continue it: + the 'att 1' and continue it:: Attaching to program: /home/jdike/linux/2.4/um/./linux, process 1 @@ -2678,63 +2657,48 @@ At this point, you debug normally. When you insmod something, the - expect magic will kick in and you'll see something like: - - - - - - - - - - - - - - - - - - *** Module hostfs loaded *** - Breakpoint 1, sys_init_module (name_user=0x805abb0 "hostfs", - mod_user=0x8070e00) at module.c:349 - 349 char *name, *n_name, *name_tmp = NULL; - (UML gdb) finish - Run till exit from #0 sys_init_module (name_user=0x805abb0 "hostfs", - mod_user=0x8070e00) at module.c:349 - 0xa00e2e23 in execute_syscall (r=0xa8140284) at syscall_kern.c:411 - 411 else res = EXECUTE_SYSCALL(syscall, regs); - Value returned is $1 = 0 - (UML gdb) - p/x (int)module_list + module_list->size_of_struct - - $2 = 0xa9021054 - (UML gdb) symbol-file ./linux - Load new symbol table from "./linux"? (y or n) y - Reading symbols from ./linux... - done. - (UML gdb) - add-symbol-file /home/jdike/linux/2.4/um/arch/um/fs/hostfs/hostfs.o 0xa9021054 - - add symbol table from file "/home/jdike/linux/2.4/um/arch/um/fs/hostfs/hostfs.o" at - .text_addr = 0xa9021054 - (y or n) y - - Reading symbols from /home/jdike/linux/2.4/um/arch/um/fs/hostfs/hostfs.o... - done. - (UML gdb) p *module_list - $1 = {size_of_struct = 84, next = 0xa0178720, name = 0xa9022de0 "hostfs", - size = 9016, uc = {usecount = {counter = 0}, pad = 0}, flags = 1, - nsyms = 57, ndeps = 0, syms = 0xa9023170, deps = 0x0, refs = 0x0, - init = 0xa90221f0 , cleanup = 0xa902222c , - ex_table_start = 0x0, ex_table_end = 0x0, persist_start = 0x0, - persist_end = 0x0, can_unload = 0, runsize = 0, kallsyms_start = 0x0, - kallsyms_end = 0x0, - archdata_start = 0x1b855
, - archdata_end = 0xe5890000
, - kernel_data = 0xf689c35d
} - >> Finished loading symbols for hostfs ... + expect magic will kick in and you'll see something like:: + + + *** Module hostfs loaded *** + Breakpoint 1, sys_init_module (name_user=0x805abb0 "hostfs", + mod_user=0x8070e00) at module.c:349 + 349 char *name, *n_name, *name_tmp = NULL; + (UML gdb) finish + Run till exit from #0 sys_init_module (name_user=0x805abb0 "hostfs", + mod_user=0x8070e00) at module.c:349 + 0xa00e2e23 in execute_syscall (r=0xa8140284) at syscall_kern.c:411 + 411 else res = EXECUTE_SYSCALL(syscall, regs); + Value returned is $1 = 0 + (UML gdb) + p/x (int)module_list + module_list->size_of_struct + + $2 = 0xa9021054 + (UML gdb) symbol-file ./linux + Load new symbol table from "./linux"? (y or n) y + Reading symbols from ./linux... + done. + (UML gdb) + add-symbol-file /home/jdike/linux/2.4/um/arch/um/fs/hostfs/hostfs.o 0xa9021054 + + add symbol table from file "/home/jdike/linux/2.4/um/arch/um/fs/hostfs/hostfs.o" at + .text_addr = 0xa9021054 + (y or n) y + + Reading symbols from /home/jdike/linux/2.4/um/arch/um/fs/hostfs/hostfs.o... + done. + (UML gdb) p *module_list + $1 = {size_of_struct = 84, next = 0xa0178720, name = 0xa9022de0 "hostfs", + size = 9016, uc = {usecount = {counter = 0}, pad = 0}, flags = 1, + nsyms = 57, ndeps = 0, syms = 0xa9023170, deps = 0x0, refs = 0x0, + init = 0xa90221f0 , cleanup = 0xa902222c , + ex_table_start = 0x0, ex_table_end = 0x0, persist_start = 0x0, + persist_end = 0x0, can_unload = 0, runsize = 0, kallsyms_start = 0x0, + kallsyms_end = 0x0, + archdata_start = 0x1b855
, + archdata_end = 0xe5890000
, + kernel_data = 0xf689c35d
} + >> Finished loading symbols for hostfs ... @@ -2744,7 +2708,7 @@ Boot the kernel under the debugger and load the module with insmod or - modprobe. With gdb, do: + modprobe. With gdb, do:: (UML gdb) p module_list @@ -2758,12 +2722,12 @@ the name fields until find the module you want to debug. Take the address of that structure, and add module.size_of_struct (which in 2.4.10 kernels is 96 (0x60)) to it. Gdb can make this hard addition - for you :-): + for you :-):: - (UML gdb) - printf "%#x\n", (int)module_list module_list->size_of_struct + (UML gdb) + printf "%#x\n", (int)module_list module_list->size_of_struct @@ -2771,7 +2735,7 @@ The offset from the module start occasionally changes (before 2.4.0, it was module.size_of_struct + 4), so it's a good idea to check the init and cleanup addresses once in a while, as describe below. Now - do: + do:: (UML gdb) @@ -2786,7 +2750,7 @@ If there's any doubt that you got the offset right, like breakpoints appear not to work, or they're appearing in the wrong place, you can check it by looking at the module structure. The init and cleanup - fields should look like: + fields should look like:: init = 0x588066b0 , cleanup = 0x588066c0 @@ -2801,7 +2765,7 @@ When you want to load in a new version of the module, you need to get gdb to forget about the old one. The only way I've found to do that - is to tell gdb to forget about all symbols that it knows about: + is to tell gdb to forget about all symbols that it knows about:: (UML gdb) symbol-file @@ -2809,7 +2773,7 @@ - Then reload the symbols from the kernel binary: + Then reload the symbols from the kernel binary:: (UML gdb) symbol-file /path/to/kernel @@ -2823,17 +2787,19 @@ - 11.5. Attaching gdb to the kernel +11.5. Attaching gdb to the kernel +---------------------------------- If you don't have the kernel running under gdb, you can attach gdb to it later by sending the tracing thread a SIGUSR1. The first line of - the console output identifies its pid: + the console output identifies its pid:: + tracing thread pid = 20093 - When you send it the signal: + When you send it the signal:: host% kill -USR1 20093 @@ -2845,7 +2811,7 @@ If you have the mconsole compiled into UML, then the mconsole client - can be used to start gdb: + can be used to start gdb:: (mconsole) (mconsole) config gdb=xterm @@ -2857,7 +2823,8 @@ - 11.6. Using alternate debuggers +11.6. Using alternate debuggers +-------------------------------- UML has support for attaching to an already running debugger rather than starting gdb itself. This is present in CVS as of 17 Apr 2001. @@ -2886,7 +2853,7 @@ An example of an alternate debugger is strace. You can strace the actual kernel as follows: - o Run the following in a shell + - Run the following in a shell:: host% @@ -2894,13 +2861,13 @@ - o Run UML with 'debug' and 'gdb-pid=' with the pid printed out + - Run UML with 'debug' and 'gdb-pid=' with the pid printed out by the previous command - o Hit return in the shell, and UML will start running, and strace + - Hit return in the shell, and UML will start running, and strace output will start accumulating in the output file. - Note that this is different from running + Note that this is different from running:: host% strace ./linux @@ -2917,95 +2884,57 @@ - 12. Kernel debugging examples +12. Kernel debugging examples +============================== - 12.1. The case of the hung fsck +12.1. The case of the hung fsck +-------------------------------- When booting up the kernel, fsck failed, and dropped me into a shell - to fix things up. I ran fsck -y, which hung: + to fix things up. I ran fsck -y, which hung:: + Setting hostname uml [ OK ] + Checking root filesystem + /dev/fhd0 was not cleanly unmounted, check forced. + Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. + /dev/fhd0: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. + (i.e., without -a or -p options) + [ FAILED ] + *** An error occurred during the file system check. + *** Dropping you to a shell; the system will reboot + *** when you leave the shell. + Give root password for maintenance + (or type Control-D for normal startup): + [root@uml /root]# fsck -y /dev/fhd0 + fsck -y /dev/fhd0 + Parallelizing fsck version 1.14 (9-Jan-1999) + e2fsck 1.14, 9-Jan-1999 for EXT2 FS 0.5b, 95/08/09 + /dev/fhd0 contains a file system with errors, check forced. + Pass 1: Checking inodes, blocks, and sizes + Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. Ignore error? yes + Inode 19780, i_blocks is 1548, should be 540. Fix? yes + Pass 2: Checking directory structure + Error reading block 49405 (Attempt to read block from filesystem resulted in short read). Ignore error? yes + Directory inode 11858, block 0, offset 0: directory corrupted + Salvage? yes + Missing '.' in directory inode 11858. + Fix? yes - - - - - - - - - - - - - - - - - - - - - - - - - - - - Setting hostname uml [ OK ] - Checking root filesystem - /dev/fhd0 was not cleanly unmounted, check forced. - Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. - - /dev/fhd0: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. - (i.e., without -a or -p options) - [ FAILED ] - - *** An error occurred during the file system check. - *** Dropping you to a shell; the system will reboot - *** when you leave the shell. - Give root password for maintenance - (or type Control-D for normal startup): - - [root@uml /root]# fsck -y /dev/fhd0 - fsck -y /dev/fhd0 - Parallelizing fsck version 1.14 (9-Jan-1999) - e2fsck 1.14, 9-Jan-1999 for EXT2 FS 0.5b, 95/08/09 - /dev/fhd0 contains a file system with errors, check forced. - Pass 1: Checking inodes, blocks, and sizes - Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. Ignore error? yes - - Inode 19780, i_blocks is 1548, should be 540. Fix? yes - - Pass 2: Checking directory structure - Error reading block 49405 (Attempt to read block from filesystem resulted in short read). Ignore error? yes - - Directory inode 11858, block 0, offset 0: directory corrupted - Salvage? yes - - Missing '.' in directory inode 11858. - Fix? yes - - Missing '..' in directory inode 11858. - Fix? yes - - - + Missing '..' in directory inode 11858. + Fix? yes The standard drill in this sort of situation is to fire up gdb on the signal thread, which, in this case, was pid 1935. In another window, - I run gdb and attach pid 1935. - - + I run gdb and attach pid 1935:: ~/linux/2.3.26/um 1016: gdb linux @@ -3022,11 +2951,7 @@ 0x100756d9 in __wait4 () - - - - - Let's see what's currently running: + Let's see what's currently running:: @@ -3041,7 +2966,7 @@ reason and never woke up. - Let's guess that the last process in the process list is fsck: + Let's guess that the last process in the process list is fsck:: @@ -3052,7 +2977,7 @@ - It is, so let's see what it thinks it's up to: + It is, so let's see what it thinks it's up to:: @@ -3068,8 +2993,6 @@ - - The interesting things here are the fact that its .thread.syscall.id is __NR_write (see the big switch in arch/um/kernel/syscall_kern.c or the defines in include/asm-um/arch/unistd.h), and that it never @@ -3081,30 +3004,20 @@ The fact that it never returned from write means that its stack should be fairly interesting. Its pid is 1980 (.thread.extern_pid). That process is being ptraced by the signal thread, so it must be detached - before gdb can attach it: + before gdb can attach it:: + (gdb) call detach(1980) - - - - - - - (gdb) call detach(1980) - - Program received signal SIGSEGV, Segmentation fault. - - The program being debugged stopped while in a function called from GDB. - When the function (detach) is done executing, GDB will silently - stop (instead of continuing to evaluate the expression containing - the function call). - (gdb) call detach(1980) - $15 = 0 - - - + Program received signal SIGSEGV, Segmentation fault. + + The program being debugged stopped while in a function called from GDB. + When the function (detach) is done executing, GDB will silently + stop (instead of continuing to evaluate the expression containing + the function call). + (gdb) call detach(1980) + $15 = 0 The first detach segfaults for some reason, and the second one @@ -3112,7 +3025,7 @@ Now I detach from the signal thread, attach to the fsck thread, and - look at its stack: + look at its stack:: (gdb) det @@ -3152,14 +3065,14 @@ - The interesting things here are : + The interesting things here are: - o There are two segfaults on this stack (frames 9 and 14) + - There are two segfaults on this stack (frames 9 and 14) - o The first faulting address (frame 11) is 0x50000800 + - The first faulting address (frame 11) is 0x50000800:: - (gdb) p (void *)1342179328 - $16 = (void *) 0x50000800 + (gdb) p (void *)1342179328 + $16 = (void *) 0x50000800 @@ -3175,7 +3088,7 @@ However, the more immediate problem is that second segfault and I'm going to concentrate on that. First, I want to see where the fault - happened, so I have to go look at the sigcontent struct in frame 8: + happened, so I have to go look at the sigcontent struct in frame 8:: @@ -3211,7 +3124,7 @@ - That's not very useful, so I'll try a more manual method: + That's not very useful, so I'll try a more manual method:: (gdb) p *((struct sigcontext *) (&sig + 1)) @@ -3224,7 +3137,7 @@ - The ip is in handle_mm_fault: + The ip is in handle_mm_fault:: (gdb) p (void *)268480945 @@ -3236,7 +3149,7 @@ - Specifically, it's in pte_alloc: + Specifically, it's in pte_alloc:: (gdb) i line *$20 @@ -3249,7 +3162,7 @@ To find where in handle_mm_fault this is, I'll jump forward in the - code until I see an address in that procedure: + code until I see an address in that procedure:: @@ -3286,21 +3199,21 @@ Something is apparently wrong with the page tables or vma_structs, so - lets go back to frame 11 and have a look at them: + lets go back to frame 11 and have a look at them:: - #11 0x1006c0aa in segv (address=1342179328, is_write=2) at trap_kern.c:50 - 50 handle_mm_fault(current, vma, address, is_write); - (gdb) call pgd_offset_proc(vma->vm_mm, address) - $22 = (pgd_t *) 0x80a548c + #11 0x1006c0aa in segv (address=1342179328, is_write=2) at trap_kern.c:50 + 50 handle_mm_fault(current, vma, address, is_write); + (gdb) call pgd_offset_proc(vma->vm_mm, address) + $22 = (pgd_t *) 0x80a548c That's pretty bogus. Page tables aren't supposed to be in process - text or data areas. Let's see what's in the vma: + text or data areas. Let's see what's in the vma:: (gdb) p *vma @@ -3325,12 +3238,9 @@ - - This also pretty bogus. With all of the 0x80xxxxx and 0xaffffxxx addresses, this is looking like a stack was plonked down on top of - these structures. Maybe it's a stack overflow from the next page: - + these structures. Maybe it's a stack overflow from the next page:: (gdb) p vma @@ -3338,52 +3248,36 @@ - - That's towards the lower quarter of the page, so that would have to - have been pretty heavy stack overflow: - - - - - - - - - - - - - - - (gdb) x/100x $25 - 0x507d2434: 0x507d2434 0x00000000 0x08048000 0x080a4f8c - 0x507d2444: 0x00000000 0x080a79e0 0x080a8c94 0x080d1000 - 0x507d2454: 0xaffffdb0 0xaffffe63 0xaffffe7a 0xaffffe7a - 0x507d2464: 0xafffffec 0x00000062 0x0000008a 0x00000000 - 0x507d2474: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2484: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2494: 0x00000000 0x00000000 0x507d2fe0 0x00000000 - 0x507d24a4: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d24b4: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d24c4: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d24d4: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d24e4: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d24f4: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2504: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2514: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2524: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2534: 0x00000000 0x00000000 0x507d25dc 0x00000000 - 0x507d2544: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2554: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2564: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2574: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2584: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d2594: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d25a4: 0x00000000 0x00000000 0x00000000 0x00000000 - 0x507d25b4: 0x00000000 0x00000000 0x00000000 0x00000000 - - + have been pretty heavy stack overflow:: + + + (gdb) x/100x $25 + 0x507d2434: 0x507d2434 0x00000000 0x08048000 0x080a4f8c + 0x507d2444: 0x00000000 0x080a79e0 0x080a8c94 0x080d1000 + 0x507d2454: 0xaffffdb0 0xaffffe63 0xaffffe7a 0xaffffe7a + 0x507d2464: 0xafffffec 0x00000062 0x0000008a 0x00000000 + 0x507d2474: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2484: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2494: 0x00000000 0x00000000 0x507d2fe0 0x00000000 + 0x507d24a4: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d24b4: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d24c4: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d24d4: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d24e4: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d24f4: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2504: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2514: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2524: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2534: 0x00000000 0x00000000 0x507d25dc 0x00000000 + 0x507d2544: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2554: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2564: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2574: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2584: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d2594: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d25a4: 0x00000000 0x00000000 0x00000000 0x00000000 + 0x507d25b4: 0x00000000 0x00000000 0x00000000 0x00000000 @@ -3399,65 +3293,53 @@ on will be somewhat clearer. - 12.2. Episode 2: The case of the hung fsck +12.2. Episode 2: The case of the hung fsck +------------------------------------------- After setting a trap in the SEGV handler for accesses to the signal thread's stack, I reran the kernel. - fsck hung again, this time by hitting the trap: + fsck hung again, this time by hitting the trap:: + Setting hostname uml [ OK ] + Checking root filesystem + /dev/fhd0 contains a file system with errors, check forced. + Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. + /dev/fhd0: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. + (i.e., without -a or -p options) + [ FAILED ] + *** An error occurred during the file system check. + *** Dropping you to a shell; the system will reboot + *** when you leave the shell. + Give root password for maintenance + (or type Control-D for normal startup): + [root@uml /root]# fsck -y /dev/fhd0 + fsck -y /dev/fhd0 + Parallelizing fsck version 1.14 (9-Jan-1999) + e2fsck 1.14, 9-Jan-1999 for EXT2 FS 0.5b, 95/08/09 + /dev/fhd0 contains a file system with errors, check forced. + Pass 1: Checking inodes, blocks, and sizes + Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. Ignore error? yes + Pass 2: Checking directory structure + Error reading block 49405 (Attempt to read block from filesystem resulted in short read). Ignore error? yes + Directory inode 11858, block 0, offset 0: directory corrupted + Salvage? yes + Missing '.' in directory inode 11858. + Fix? yes + Missing '..' in directory inode 11858. + Fix? yes - - - - - - Setting hostname uml [ OK ] - Checking root filesystem - /dev/fhd0 contains a file system with errors, check forced. - Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. - - /dev/fhd0: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. - (i.e., without -a or -p options) - [ FAILED ] - - *** An error occurred during the file system check. - *** Dropping you to a shell; the system will reboot - *** when you leave the shell. - Give root password for maintenance - (or type Control-D for normal startup): - - [root@uml /root]# fsck -y /dev/fhd0 - fsck -y /dev/fhd0 - Parallelizing fsck version 1.14 (9-Jan-1999) - e2fsck 1.14, 9-Jan-1999 for EXT2 FS 0.5b, 95/08/09 - /dev/fhd0 contains a file system with errors, check forced. - Pass 1: Checking inodes, blocks, and sizes - Error reading block 86894 (Attempt to read block from filesystem resulted in short read) while reading indirect blocks of inode 19780. Ignore error? yes - - Pass 2: Checking directory structure - Error reading block 49405 (Attempt to read block from filesystem resulted in short read). Ignore error? yes - - Directory inode 11858, block 0, offset 0: directory corrupted - Salvage? yes - - Missing '.' in directory inode 11858. - Fix? yes - - Missing '..' in directory inode 11858. - Fix? yes - - Untested (4127) [100fe44c]: trap_kern.c line 31 + Untested (4127) [100fe44c]: trap_kern.c line 31 @@ -3465,7 +3347,7 @@ I need to get the signal thread to detach from pid 4127 so that I can attach to it with gdb. This is done by sending it a SIGUSR1, which is - caught by the signal thread, which detaches the process: + caught by the signal thread, which detaches the process:: kill -USR1 4127 @@ -3474,31 +3356,20 @@ - Now I can run gdb on it: - - - - - - - - - - - - - - ~/linux/2.3.26/um 1034: gdb linux - GNU gdb 4.17.0.11 with Linux support - Copyright 1998 Free Software Foundation, Inc. - GDB is free software, covered by the GNU General Public License, and you are - welcome to change it and/or distribute copies of it under certain conditions. - Type "show copying" to see the conditions. - There is absolutely no warranty for GDB. Type "show warranty" for details. - This GDB was configured as "i386-redhat-linux"... - (gdb) att 4127 - Attaching to program `/home/dike/linux/2.3.26/um/linux', Pid 4127 - 0x10075891 in __libc_nanosleep () + Now I can run gdb on it:: + + + ~/linux/2.3.26/um 1034: gdb linux + GNU gdb 4.17.0.11 with Linux support + Copyright 1998 Free Software Foundation, Inc. + GDB is free software, covered by the GNU General Public License, and you are + welcome to change it and/or distribute copies of it under certain conditions. + Type "show copying" to see the conditions. + There is absolutely no warranty for GDB. Type "show warranty" for details. + This GDB was configured as "i386-redhat-linux"... + (gdb) att 4127 + Attaching to program `/home/dike/linux/2.3.26/um/linux', Pid 4127 + 0x10075891 in __libc_nanosleep () @@ -3506,7 +3377,7 @@ The backtrace shows that it was in a write and that the fault address (address in frame 3) is 0x50000800, which is right in the middle of - the signal thread's stack page: + the signal thread's stack page:: (gdb) bt @@ -3540,58 +3411,48 @@ - - Going up the stack to the segv_handler frame and looking at where in the code the access happened shows that it happened near line 110 of - block_dev.c: - - - - - - - - - - (gdb) up - #1 0x1007584d in __sleep (seconds=1000000) - at ../sysdeps/unix/sysv/linux/sleep.c:78 - ../sysdeps/unix/sysv/linux/sleep.c:78: No such file or directory. - (gdb) - #2 0x1006ce9a in stop () at user_util.c:191 - 191 while(1) sleep(1000000); - (gdb) - #3 0x1006bf88 in segv (address=1342179328, is_write=2) at trap_kern.c:31 - 31 KERN_UNTESTED(); - (gdb) - #4 0x1006c628 in segv_handler (sc=0x5006eaf8) at trap_user.c:174 - 174 segv(sc->cr2, sc->err & 2); - (gdb) p *sc - $1 = {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 43, - __dsh = 0, edi = 1342179328, esi = 134973440, ebp = 1342631484, - esp = 1342630864, ebx = 256, edx = 0, ecx = 256, eax = 1024, trapno = 14, - err = 6, eip = 268550834, cs = 35, __csh = 0, eflags = 66070, - esp_at_signal = 1342630864, ss = 43, __ssh = 0, fpstate = 0x0, oldmask = 0, - cr2 = 1342179328} - (gdb) p (void *)268550834 - $2 = (void *) 0x1001c2b2 - (gdb) i sym $2 - block_write + 1090 in section .text - (gdb) i line *$2 - Line 209 of "/home/dike/linux/2.3.26/um/include/asm/arch/string.h" - starts at address 0x1001c2a1 - and ends at 0x1001c2bf . - (gdb) i line *0x1001c2c0 - Line 110 of "block_dev.c" starts at address 0x1001c2bf - and ends at 0x1001c2e3 . - - + block_dev.c:: + + + + (gdb) up + #1 0x1007584d in __sleep (seconds=1000000) + at ../sysdeps/unix/sysv/linux/sleep.c:78 + ../sysdeps/unix/sysv/linux/sleep.c:78: No such file or directory. + (gdb) + #2 0x1006ce9a in stop () at user_util.c:191 + 191 while(1) sleep(1000000); + (gdb) + #3 0x1006bf88 in segv (address=1342179328, is_write=2) at trap_kern.c:31 + 31 KERN_UNTESTED(); + (gdb) + #4 0x1006c628 in segv_handler (sc=0x5006eaf8) at trap_user.c:174 + 174 segv(sc->cr2, sc->err & 2); + (gdb) p *sc + $1 = {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 43, + __dsh = 0, edi = 1342179328, esi = 134973440, ebp = 1342631484, + esp = 1342630864, ebx = 256, edx = 0, ecx = 256, eax = 1024, trapno = 14, + err = 6, eip = 268550834, cs = 35, __csh = 0, eflags = 66070, + esp_at_signal = 1342630864, ss = 43, __ssh = 0, fpstate = 0x0, oldmask = 0, + cr2 = 1342179328} + (gdb) p (void *)268550834 + $2 = (void *) 0x1001c2b2 + (gdb) i sym $2 + block_write + 1090 in section .text + (gdb) i line *$2 + Line 209 of "/home/dike/linux/2.3.26/um/include/asm/arch/string.h" + starts at address 0x1001c2a1 + and ends at 0x1001c2bf . + (gdb) i line *0x1001c2c0 + Line 110 of "block_dev.c" starts at address 0x1001c2bf + and ends at 0x1001c2e3 . Looking at the source shows that the fault happened during a call to - copy_from_user to copy the data into the kernel: + copy_from_user to copy the data into the kernel:: 107 count -= chars; @@ -3601,10 +3462,8 @@ - - p is the pointer which must contain 0x50000800, since buf contains - 0x80b8800 (frame 8 above). It is defined as: + 0x80b8800 (frame 8 above). It is defined as:: p = offset + bh->b_data; @@ -3615,24 +3474,22 @@ I need to figure out what bh is, and it just so happens that bh is passed as an argument to mark_buffer_uptodate and mark_buffer_dirty a - few lines later, so I do a little disassembly: + few lines later, so I do a little disassembly:: - - - (gdb) disas 0x1001c2bf 0x1001c2e0 - Dump of assembler code from 0x1001c2bf to 0x1001c2d0: - 0x1001c2bf : addl %eax,0xc(%ebp) - 0x1001c2c2 : movl 0xfffffdd4(%ebp),%edx - 0x1001c2c8 : btsl $0x0,0x18(%edx) - 0x1001c2cd : btsl $0x1,0x18(%edx) - 0x1001c2d2 : sbbl %ecx,%ecx - 0x1001c2d4 : testl %ecx,%ecx - 0x1001c2d6 : jne 0x1001c2e3 - 0x1001c2d8 : pushl $0x0 - 0x1001c2da : pushl %edx - 0x1001c2db : call 0x1001819c <__mark_buffer_dirty> - End of assembler dump. + (gdb) disas 0x1001c2bf 0x1001c2e0 + Dump of assembler code from 0x1001c2bf to 0x1001c2d0: + 0x1001c2bf : addl %eax,0xc(%ebp) + 0x1001c2c2 : movl 0xfffffdd4(%ebp),%edx + 0x1001c2c8 : btsl $0x0,0x18(%edx) + 0x1001c2cd : btsl $0x1,0x18(%edx) + 0x1001c2d2 : sbbl %ecx,%ecx + 0x1001c2d4 : testl %ecx,%ecx + 0x1001c2d6 : jne 0x1001c2e3 + 0x1001c2d8 : pushl $0x0 + 0x1001c2da : pushl %edx + 0x1001c2db : call 0x1001819c <__mark_buffer_dirty> + End of assembler dump. @@ -3640,7 +3497,7 @@ At that point, bh is in %edx (address 0x1001c2da), which is calculated at 0x1001c2c2 as %ebp + 0xfffffdd4, so I figure exactly what that is, - taking %ebp from the sigcontext_struct above: + taking %ebp from the sigcontext_struct above:: (gdb) p (void *)1342631484 @@ -3657,7 +3514,7 @@ Now, I look at the structure to see what's in it, and particularly, - what its b_data field contains: + what its b_data field contains:: (gdb) p *((struct buffer_head *)0x50100200) @@ -3682,18 +3539,18 @@ The b_page field is a pointer to the page_struct representing the 0x50000000 page. Looking at it shows the kernel's idea of the state - of that page: + of that page:: - (gdb) p *$13.b_page - $17 = {list = {next = 0x50004a5c, prev = 0x100c5174}, mapping = 0x0, - index = 0, next_hash = 0x0, count = {counter = 1}, flags = 132, lru = { - next = 0x50008460, prev = 0x50019350}, wait = { - lock = , task_list = {next = 0x50004024, - prev = 0x50004024}, __magic = 1342193708, __creator = 0}, - pprev_hash = 0x0, buffers = 0x501002c0, virtual = 1342177280, - zone = 0x100c5160} + (gdb) p *$13.b_page + $17 = {list = {next = 0x50004a5c, prev = 0x100c5174}, mapping = 0x0, + index = 0, next_hash = 0x0, count = {counter = 1}, flags = 132, lru = { + next = 0x50008460, prev = 0x50019350}, wait = { + lock = , task_list = {next = 0x50004024, + prev = 0x50004024}, __magic = 1342193708, __creator = 0}, + pprev_hash = 0x0, buffers = 0x501002c0, virtual = 1342177280, + zone = 0x100c5160} @@ -3702,7 +3559,7 @@ Some sanity-checking: the virtual field shows the "virtual" address of this page, which in this kernel is the same as its "physical" address, and the page_struct itself should be mem_map[0], since it represents - the first page of memory: + the first page of memory:: @@ -3719,7 +3576,7 @@ Now to check out the page_struct itself. In particular, the flags - field shows whether the page is considered free or not: + field shows whether the page is considered free or not:: (gdb) p (void *)132 @@ -3739,7 +3596,7 @@ In my setup_arch procedure, I have the following code which looks just - fine: + fine:: @@ -3762,7 +3619,7 @@ Stepping into init_bootmem, and looking at bootmem_map before looking - at what it contains shows the following: + at what it contains shows the following:: @@ -3788,18 +3645,20 @@ - 13. What to do when UML doesn't work +13. What to do when UML doesn't work +===================================== - 13.1. Strange compilation errors when you build from source +13.1. Strange compilation errors when you build from source +------------------------------------------------------------ As of test11, it is necessary to have "ARCH=um" in the environment or on the make command line for all steps in building UML, including clean, distclean, or mrproper, config, menuconfig, or xconfig, dep, and linux. If you forget for any of them, the i386 build seems to - contaminate the UML build. If this happens, start from scratch with + contaminate the UML build. If this happens, start from scratch with:: host% @@ -3811,7 +3670,7 @@ and repeat the build process with ARCH=um on all the steps. - See ``Compiling the kernel and modules'' for more details. + See :ref:`Compiling_the_kernel_and_modules` for more details. Another cause of strange compilation errors is building UML in @@ -3824,11 +3683,11 @@ - 13.3. A variety of panics and hangs with /tmp on a reiserfs filesys- - tem +13.3. A variety of panics and hangs with /tmp on a reiserfs filesystem +----------------------------------------------------------------------- I saw this on reiserfs 3.5.21 and it seems to be fixed in 3.5.27. - Panics preceded by + Panics preceded by:: Detaching pid nnnn @@ -3854,17 +3713,19 @@ - 13.5. UML doesn't work when /tmp is an NFS filesystem +13.5. UML doesn't work when /tmp is an NFS filesystem +------------------------------------------------------ This seems to be a similar situation with the ReiserFS problem above. Some versions of NFS seems not to handle mmap correctly, which UML depends on. The workaround is have /tmp be a non-NFS directory. - 13.6. UML hangs on boot when compiled with gprof support +13.6. UML hangs on boot when compiled with gprof support +--------------------------------------------------------- If you build UML with gprof support and, early in the boot, it does - this + this:: kernel BUG at page_alloc.c:100! @@ -3878,10 +3739,11 @@ - 13.7. syslogd dies with a SIGTERM on startup +13.7. syslogd dies with a SIGTERM on startup +--------------------------------------------- The exact boot error depends on the distribution that you're booting, - but Debian produces this: + but Debian produces this:: /etc/rc2.d/S10sysklogd: line 49: 93 Terminated @@ -3897,17 +3759,18 @@ - 13.8. TUN/TAP networking doesn't work on a 2.4 host +13.8. TUN/TAP networking doesn't work on a 2.4 host +---------------------------------------------------- There are a couple of problems which were name="pointed out"> by Tim Robinson - o It doesn't work on hosts running 2.4.7 (or thereabouts) or earlier. + - It doesn't work on hosts running 2.4.7 (or thereabouts) or earlier. The fix is to upgrade to something more recent and then read the next item. - o If you see + - If you see:: File descriptor in bad state @@ -3921,8 +3784,8 @@ - 13.9. You can network to the host but not to other machines on the - net +13.9. You can network to the host but not to other machines on the net +======================================================================= If you can connect to the host, and the host can connect to UML, but you cannot connect to any other machines, then you may need to enable @@ -3930,7 +3793,7 @@ using private IP addresses (192.168.x.x or 10.x.x.x) for host/UML networking, rather than the public address space that your host is connected to. UML does not enable IP Masquerading, so you will need - to create a static rule to enable it: + to create a static rule to enable it:: host% @@ -3948,7 +3811,7 @@ If you can reach the local net, but not the outside Internet, then - that is usually a routing problem. The UML needs a default route: + that is usually a routing problem. The UML needs a default route:: UML# @@ -3972,7 +3835,8 @@ - 13.10. I have no root and I want to scream +13.10. I have no root and I want to scream +=========================================== Thanks to Birgit Wahlich for telling me about this strange one. It turns out that there's a limit of six environment variables on the @@ -3987,14 +3851,16 @@ - 13.11. UML build conflict between ptrace.h and ucontext.h +13.11. UML build conflict between ptrace.h and ucontext.h +========================================================== On some older systems, /usr/include/asm/ptrace.h and /usr/include/sys/ucontext.h define the same names. So, when they're included together, the defines from one completely mess up the parsing - of the other, producing errors like: + of the other, producing errors like:: + /usr/include/sys/ucontext.h:47: parse error before - `10' + `10` @@ -4007,7 +3873,8 @@ - 13.12. The UML BogoMips is exactly half the host's BogoMips +13.12. The UML BogoMips is exactly half the host's BogoMips +------------------------------------------------------------ On i386 kernels, there are two ways of running the loop that is used to calculate the BogoMips rating, using the TSC if it's there or using @@ -4019,15 +3886,17 @@ - 13.13. When you run UML, it immediately segfaults +13.13. When you run UML, it immediately segfaults +-------------------------------------------------- If the host is configured with the 2G/2G address space split, that's - why. See ``UML on 2G/2G hosts'' for the details on getting UML to + why. See ref:`UML_on_2G/2G_hosts` for the details on getting UML to run on your host. - 13.14. xterms appear, then immediately disappear +13.14. xterms appear, then immediately disappear +------------------------------------------------- If you're running an up to date kernel with an old release of uml_utilities, the port-helper program will not work properly, so @@ -4039,7 +3908,8 @@ - 13.15. Any other panic, hang, or strange behavior +13.15. Any other panic, hang, or strange behavior +-------------------------------------------------- If you're seeing truly strange behavior, such as hangs or panics that happen in random places, or you try running the debugger to see what's @@ -4057,9 +3927,13 @@ it and that a fix is imminent. - If you want to be super-helpful, read ``Diagnosing Problems'' and + If you want to be super-helpful, read :ref:`Diagnosing_Problems` and follow the instructions contained therein. - 14. Diagnosing Problems + +.. _Diagnosing_Problems: + +14. Diagnosing Problems +======================== If you get UML to crash, hang, or otherwise misbehave, you should @@ -4074,21 +3948,22 @@ For any diagnosis, you're going to need to build a debugging kernel. The binaries from this site aren't debuggable. If you haven't done - this before, read about ``Compiling the kernel and modules'' and - ``Kernel debugging'' UML first. + this before, read about :ref:`Compiling_the_kernel_and_modules` and + :ref:`Kernel_debugging` UML first. - 14.1. Case 1 : Normal kernel panics +14.1. Case 1 : Normal kernel panics +------------------------------------ The most common case is for a normal thread to panic. To debug this, you will need to run it under the debugger (add 'debug' to the command line). An xterm will start up with gdb running inside it. Continue - it when it stops in start_kernel and make it crash. Now ^C gdb and + it when it stops in start_kernel and make it crash. Now ``^C gdb`` and If the panic was a "Kernel mode fault", then there will be a segv frame on the stack and I'm going to want some more information. The - stack might look something like this: + stack might look something like this:: (UML gdb) backtrace @@ -4107,7 +3982,7 @@ I'm going to want to see the symbol and line information for the value - of ip in the segv frame. In this case, you would do the following: + of ip in the segv frame. In this case, you would do the following:: (UML gdb) i sym 268849158 @@ -4115,7 +3990,7 @@ - and + and:: (UML gdb) i line *268849158 @@ -4128,7 +4003,8 @@ to get that information from the faulting ip. - 14.2. Case 2 : Tracing thread panics +14.2. Case 2 : Tracing thread panics +------------------------------------- The less common and more painful case is when the tracing thread panics. In this case, the kernel debugger will be useless because it @@ -4136,7 +4012,7 @@ do is get a backtrace from the tracing thread. This is done by figuring out what its pid is, firing up gdb, and attaching it to that pid. You can figure out the tracing thread pid by looking at the - first line of the console output, which will look like this: + first line of the console output, which will look like this:: tracing thread pid = 15851 @@ -4145,7 +4021,7 @@ or by running ps on the host and finding the line that looks like - this: + this:: jdike 15851 4.5 0.4 132568 1104 pts/0 S 21:34 0:05 ./linux [(tracing thread)] @@ -4164,7 +4040,7 @@ 14.3. Case 3 : Tracing thread panics caused by other threads However, there are cases where the misbehavior of another thread - caused the problem. The most common panic of this type is: + caused the problem. The most common panic of this type is:: wait_for_stop failed to wait for to stop with @@ -4177,7 +4053,7 @@ debugger is defunct and without some fancy footwork, another gdb can't attach to it. So, this is how the fancy footwork goes: - In a shell: + In a shell:: host% kill -STOP pid @@ -4185,7 +4061,7 @@ - Run gdb on the tracing thread as described in case 2 and do: + Run gdb on the tracing thread as described in case 2 and do:: (host gdb) call detach(pid) @@ -4193,7 +4069,7 @@ If you get a segfault, do it again. It always works the second time. - Detach from the tracing thread and attach to that other thread: + Detach from the tracing thread and attach to that other thread:: (host gdb) detach @@ -4209,7 +4085,7 @@ If gdb hangs when attaching to that process, go back to a shell and - do: + do:: host% @@ -4218,7 +4094,7 @@ - And then get the backtrace: + And then get the backtrace:: (host gdb) backtrace @@ -4227,13 +4103,14 @@ - 14.4. Case 4 : Hangs +14.4. Case 4 : Hangs +--------------------- Hangs seem to be fairly rare, but they sometimes happen. When a hang happens, we need a backtrace from the offending process. Run the kernel debugger as described in case 1 and get a backtrace. If the current process is not the idle thread, then send in the backtrace. - You can tell that it's the idle thread if the stack looks like this: + You can tell that it's the idle thread if the stack looks like this:: #0 0x100b1401 in __libc_nanosleep () @@ -4257,7 +4134,8 @@ - 15. Thanks +15. Thanks +=========== A number of people have helped this project in various ways, and this @@ -4274,20 +4152,21 @@ bookkeeping lapses and I forget about contributions. - 15.1. Code and Documentation +15.1. Code and Documentation +----------------------------- Rusty Russell - - o wrote the HOWTO - o prodded me into making this project official and putting it on + - prodded me into making this project official and putting it on SourceForge - o came up with the way cool UML logo - o redid the config process + - redid the config process Peter Moulder - Fixed my config and build @@ -4296,18 +4175,18 @@ Bill Stearns - - o HOWTO updates + - HOWTO updates - o lots of bug reports + - lots of bug reports - o lots of testing + - lots of testing - o dedicated a box (uml.ists.dartmouth.edu) to support UML development + - dedicated a box (uml.ists.dartmouth.edu) to support UML development - o wrote the mkrootfs script, which allows bootable filesystems of + - wrote the mkrootfs script, which allows bootable filesystems of RPM-based distributions to be cranked out - o cranked out a large number of filesystems with said script + - cranked out a large number of filesystems with said script Jim Leu - Wrote the virtual ethernet driver @@ -4375,176 +4254,180 @@ David Coulson - - o Set up the usermodelinux.org site, + - Set up the usermodelinux.org site, which is a great way of keeping the UML user community on top of UML goings-on. - o Site documentation and updates + - Site documentation and updates - o Nifty little UML management daemon UMLd + - Nifty little UML management daemon UMLd - o Lots of testing and bug reports + - Lots of testing and bug reports - 15.2. Flushing out bugs +15.2. Flushing out bugs +------------------------ - o Yuri Pudgorodsky + - Yuri Pudgorodsky - o Gerald Britton + - Gerald Britton - o Ian Wehrman + - Ian Wehrman - o Gord Lamb + - Gord Lamb - o Eugene Koontz + - Eugene Koontz - o John H. Hartman + - John H. Hartman - o Anders Karlsson + - Anders Karlsson - o Daniel Phillips + - Daniel Phillips - o John Fremlin + - John Fremlin - o Rainer Burgstaller + - Rainer Burgstaller - o James Stevenson + - James Stevenson - o Matt Clay + - Matt Clay - o Cliff Jefferies + - Cliff Jefferies - o Geoff Hoff + - Geoff Hoff - o Lennert Buytenhek + - Lennert Buytenhek - o Al Viro + - Al Viro - o Frank Klingenhoefer + - Frank Klingenhoefer - o Livio Baldini Soares + - Livio Baldini Soares - o Jon Burgess + - Jon Burgess - o Petru Paler + - Petru Paler - o Paul + - Paul - o Chris Reahard + - Chris Reahard - o Sverker Nilsson + - Sverker Nilsson - o Gong Su + - Gong Su - o johan verrept + - johan verrept - o Bjorn Eriksson + - Bjorn Eriksson - o Lorenzo Allegrucci + - Lorenzo Allegrucci - o Muli Ben-Yehuda + - Muli Ben-Yehuda - o David Mansfield + - David Mansfield - o Howard Goff + - Howard Goff - o Mike Anderson + - Mike Anderson - o John Byrne + - John Byrne - o Sapan J. Batia + - Sapan J. Batia - o Iris Huang + - Iris Huang - o Jan Hudec + - Jan Hudec - o Voluspa + - Voluspa - 15.3. Buglets and clean-ups +15.3. Buglets and clean-ups +---------------------------- - o Dave Zarzycki + - Dave Zarzycki - o Adam Lazur + - Adam Lazur - o Boria Feigin + - Boria Feigin - o Brian J. Murrell + - Brian J. Murrell - o JS + - JS - o Roman Zippel + - Roman Zippel - o Wil Cooley + - Wil Cooley - o Ayelet Shemesh + - Ayelet Shemesh - o Will Dyson + - Will Dyson - o Sverker Nilsson + - Sverker Nilsson - o dvorak + - dvorak - o v.naga srinivas + - v.naga srinivas - o Shlomi Fish + - Shlomi Fish - o Roger Binns + - Roger Binns - o johan verrept + - johan verrept - o MrChuoi + - MrChuoi - o Peter Cleve + - Peter Cleve - o Vincent Guffens + - Vincent Guffens - o Nathan Scott + - Nathan Scott - o Patrick Caulfield + - Patrick Caulfield - o jbearce + - jbearce - o Catalin Marinas + - Catalin Marinas - o Shane Spencer + - Shane Spencer - o Zou Min + - Zou Min - o Ryan Boder + - Ryan Boder - o Lorenzo Colitti + - Lorenzo Colitti - o Gwendal Grignou + - Gwendal Grignou - o Andre' Breiler + - Andre' Breiler - o Tsutomu Yasuda + - Tsutomu Yasuda - 15.4. Case Studies +15.4. Case Studies +------------------- - o Jon Wright + - Jon Wright - o William McEwan + - William McEwan - o Michael Richardson + - Michael Richardson - 15.5. Other contributions +15.5. Other contributions +-------------------------- Bill Carr made the Red Hat mkrootfs script @@ -4575,15 +4458,3 @@ server jailed inside UML. It's available from the download page in the Jail Filesystems section. - - - - - - - - - - - - From patchwork Mon Feb 10 06:02:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372521 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 448B392A for ; Mon, 10 Feb 2020 06:03:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 221CC24685 for ; Mon, 10 Feb 2020 06:03:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314604; bh=CCB9J07T/80+IsrntbbRDukpQNpe71X8YA4l6vdAkPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Z7Wkf5skSlK84y/vCGpP1yWxoP55FZlKLIRJGrNLTJHgpxZfB3ZrNkgq5N2Jpda1x lTrObEvLEnD2j8lXNFMMS04ZfbCI/OSj+tBlr1uswheNMLnYFpuPUy4QVBRQEmYVKV qHckfY8nulVUZ9FSDYgzPFnJMzMB0kQGQwrqeMfc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727675AbgBJGDX (ORCPT ); Mon, 10 Feb 2020 01:03:23 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36456 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727581AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=5C1Pl5mrdwkmC0Ibs5rVWyWq5pet5BdrcnU/u0rt7EY=; b=A/TznRQXNYBxeegModDRxPmZwR QV0mWYWmotsCWAt8meRxLlJmp58JE2I41Mlbzdv7CvMLsNkFR4bA+AJ2creD0EVk5E9aDcKAO5wX0 KKK7O90S0fOHHLCkbd0cWfsvQfrHSWLJn3Fj7M6GYcU08+fLZuT5+ZrL5EZWNuF3ckfaBkVgYxvMB WGCtLYbGsNAOhWLT/JAqdu44xv6HQuGwDw+e5Eb8iiFSpxBkc/OWjwT9hyYoz9dYmhKXkGAD5llAi nxUpAyEsFg30W0TER7lk0Xq83OTlYE67V1zhaMGia341DM2CMVcz7LyHTj+y06M/cLuEStrG2dydL c6HvShnw==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Td-GC; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A1-00C2Un-Qx; Mon, 10 Feb 2020 07:03:09 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Jeff Dike , Richard Weinberger , Anton Ivanov , Jonathan Corbet , linux-um@lists.infradead.org, linux-doc@vger.kernel.org Subject: [PATCH 03/28] docs: virt: user_mode_linux.rst: update compiling instructions Date: Mon, 10 Feb 2020 07:02:41 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Instead of pointing for a pre-2.4 and a seaparate patch, update it to match current upstream, as UML was merged a long time ago. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/uml/user_mode_linux.rst | 62 ++++------------------ 1 file changed, 9 insertions(+), 53 deletions(-) diff --git a/Documentation/virt/uml/user_mode_linux.rst b/Documentation/virt/uml/user_mode_linux.rst index 6085d2c0f8a8..e0632d80753e 100644 --- a/Documentation/virt/uml/user_mode_linux.rst +++ b/Documentation/virt/uml/user_mode_linux.rst @@ -5,7 +5,7 @@ User Mode Linux HOWTO ===================== :Author: User Mode Linux Core Team -:Last-updated: Mon Nov 18 14:16:16 EST 2002 +:Last-updated: Sat Jan 25 16:07:55 CET 2020 This document describes the use and abuse of Jeff Dike's User Mode Linux: a port of the Linux kernel as a normal Intel Linux process. @@ -223,23 +223,15 @@ Linux: a port of the Linux kernel as a normal Intel Linux process. Compiling the user mode kernel is just like compiling any other - kernel. Let's go through the steps, using 2.4.0-prerelease (current - as of this writing) as an example: + kernel. - 1. Download the latest UML patch from - the download page stop compiling. - - The sources are also available from cvs at the project's cvs page, - which has directions on getting the sources. You can also browse the - CVS pool from there. - - If you get the CVS sources, you will have to check them out into an - empty directory. You will then have to copy each file into the - corresponding directory in the appropriate kernel pool. - - If you don't have the latest kernel pool, you can get the - corresponding user-mode sources with:: - - - host% cvs co -r v_2_3_x linux - - - - - where 'x' is the version in your pool. Note that you will not get the - bug fixes and enhancements that have gone into subsequent releases. - 2.2. Compiling and installing kernel modules --------------------------------------------- @@ -416,7 +372,7 @@ Linux: a port of the Linux kernel as a normal Intel Linux process. 3.1. Running UML ----------------- - It runs on 2.2.15 or later, and all 2.4 kernels. + It runs on 2.2.15 or later, and all kernel versions since 2.4. Booting UML is straightforward. Simply run 'linux': it will try to From patchwork Mon Feb 10 06:02:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372519 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7929592A for ; Mon, 10 Feb 2020 06:03:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4E8FE2468A for ; Mon, 10 Feb 2020 06:03:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314603; bh=AxDvjIpCQVaSrVfyS6ikPPKeZ49TRpNm9YByYGVJhF0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FuRzQGBSwp/XLk9FlJcUxvbX9MszX4Lof8zCKik52V9iKs8zJTTiRHH3Sb+TJ8flu mlQ1LRe/A4yARwdG1De3IjSA3XVm4SagRH6g5cOdlpLQjje9wMy6l+i91D6onRDE9V ybQT+vMe1Y8RhDifC4brBrpVeDW7xBZUS9TMyF74= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727658AbgBJGDW (ORCPT ); Mon, 10 Feb 2020 01:03:22 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36468 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727587AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=AkWGbYs/Tc4L0PtFVpG/Hbx8MoKG1TWn2p2YU4gP5Hs=; b=T+OSy4/BQbpbvYYJVqqVzGgFc7 EbSaxJYsEYGOUXGr4aJ7+1NR44DLaKiiXsQGvhSY1VcJYy4iXDn3vXzqIrdg62oKFtpMP35z06/SV xVISb1XYNBpLeZFrQW8Dhef4pvgMUr5Uhpc6u2/c50AMWouWx75hEuN75Mqo0h+wH3QmWP64MdIPl VAY4ot5OXzcYt+9YC1K7JH7iWl0FdktEo063k9hLTukRI3wCmXAo2GZnqjQpt2oNcPH29p8xGUEFZ MNeWpMJivroKyOIpCGenTRnwaRtbARnnQudb8Hz9bYhN6u0CSzow1FmfOlunqhO8baX2gnNK+ycNK v5Q68VbA==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Te-HC; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A1-00C2Us-Ry; Mon, 10 Feb 2020 07:03:09 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Jeff Dike , Richard Weinberger , Anton Ivanov , Jonathan Corbet , linux-um@lists.infradead.org, linux-doc@vger.kernel.org Subject: [PATCH 04/28] docs: virt: user_mode_linux.rst: fix URL references Date: Mon, 10 Feb 2020 07:02:42 +0100 Message-Id: <7703891859ba5dae121fa9fa21914512ba3d3fbb.1581314316.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Several URLs are pointing to outdated places. Update the references for the URLs whose contents still exists, removing the others. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/uml/user_mode_linux.rst | 71 +++++++++------------- 1 file changed, 29 insertions(+), 42 deletions(-) diff --git a/Documentation/virt/uml/user_mode_linux.rst b/Documentation/virt/uml/user_mode_linux.rst index e0632d80753e..de0f0b2c9d5b 100644 --- a/Documentation/virt/uml/user_mode_linux.rst +++ b/Documentation/virt/uml/user_mode_linux.rst @@ -321,7 +321,7 @@ Linux: a port of the Linux kernel as a normal Intel Linux process. as modules, especially filesystems and network protocols and filters, so most symbols which need to be exported probably already are. However, if you do find symbols that need exporting, let us - know, and + know at http://user-mode-linux.sourceforge.net/, and they'll be "taken care of". @@ -383,9 +383,9 @@ Linux: a port of the Linux kernel as a normal Intel Linux process. You will need a filesystem to boot UML from. There are a number - available for download from here . There are also several tools - which can be + available for download from http://user-mode-linux.sourceforge.net. + There are also several tools at + http://user-mode-linux.sourceforge.net/ which can be used to generate UML-compatible filesystem images from media. The kernel will boot up and present you with a login prompt. @@ -464,10 +464,9 @@ Note: Here are some examples of UML in action: - - A login session - - - A virtual network + - A login session http://user-mode-linux.sourceforge.net/old/login.html + - A virtual network http://user-mode-linux.sourceforge.net/old/net.html @@ -1132,11 +1131,6 @@ Note: - - Harald's original README is here and explains these in detail, as well as - some other issues. - There is also a related point-to-point only "ucast" transport. This is useful when your network does not support multicast, and all network connections are simple point to point links. @@ -1219,8 +1213,7 @@ Note: make sure that /usr/src/linux points to the headers for the running kernel. - These were pointed out by Tim Robinson in - name="this uml-user post"> . + These were pointed out by Tim Robinson in the past. @@ -1914,8 +1907,8 @@ Note: uml_moo is installed with the UML deb and RPM. If you didn't install UML from one of those packages, you can also get it from the UML - utilities tar file in tools/moo. + utilities http://user-mode-linux.sourceforge.net/utilities tar file + in tools/moo. @@ -3709,18 +3702,15 @@ Note: This is a syslogd bug. There's a race between a parent process - installing a signal handler and its child sending the signal. See - this uml-devel post for the details. + installing a signal handler and its child sending the signal. 13.8. TUN/TAP networking doesn't work on a 2.4 host ---------------------------------------------------- - There are a couple of problems which were - name="pointed - out"> by Tim Robinson + There are a couple of problems which were reported by + Tim Robinson - It doesn't work on hosts running 2.4.7 (or thereabouts) or earlier. The fix is to upgrade to something more recent and then read the @@ -3763,7 +3753,7 @@ Note: Documentation on IP Masquerading, and SNAT, can be found at - www.netfilter.org . + http://www.netfilter.org. If you can reach the local net, but not the outside Internet, then @@ -4113,14 +4103,14 @@ Note: Rusty Russell - - - wrote the HOWTO + - wrote the HOWTO + http://user-mode-linux.sourceforge.net/old/UserModeLinux-HOWTO.html - prodded me into making this project official and putting it on SourceForge - - came up with the way cool UML logo + - came up with the way cool UML logo + http://user-mode-linux.sourceforge.net/uml-small.png - redid the config process @@ -4148,17 +4138,15 @@ Note: Jim Leu - Wrote the virtual ethernet driver and associated usermode tools - Lars Brinkhoff - Contributed the ptrace - proxy from his own project to allow easier - kernel debugging + Lars Brinkhoff http://lars.nocrew.org/ - Contributed the ptrace + proxy from his own project to allow easier kernel debugging Andrea Arcangeli - Redid some of the early boot code so that it would work on machines with Large File Support - Chris Emerson - Did - the first UML port to Linux/ppc + Chris Emerson - Did the first UML port to Linux/ppc Harald Welte - Wrote the multicast @@ -4173,7 +4161,7 @@ Note: wrote the iomem emulation support - Henrik Nordstrom - Provided a variety + Henrik Nordstrom http://hem.passagen.se/hno/ - Provided a variety of patches, fixes, and clues @@ -4208,16 +4196,15 @@ Note: submitted patches for the slip transport and lots of other things. - David Coulson - + David Coulson http://davidcoulson.net - - - Set up the usermodelinux.org site, + - Set up the http://usermodelinux.org site, which is a great way of keeping the UML user community on top of UML goings-on. - Site documentation and updates - Nifty little UML management daemon UMLd - - Lots of testing and bug reports @@ -4390,12 +4377,12 @@ Note: work with RH 6.2. Michael Jennings sent in some material which - is now gracing the top of the index page of this site. + is now gracing the top of the index page + http://user-mode-linux.sourceforge.net/ of this site. - SGI (and more specifically Ralf Baechle ) gave me an account on oss.sgi.com - . The bandwidth there made it possible to + SGI (and more specifically Ralf Baechle ) gave me an account on oss.sgi.com. + The bandwidth there made it possible to produce most of the filesystems available on the project download page. @@ -4412,5 +4399,5 @@ Note: Chris Reahard built a specialized root filesystem for running a DNS server jailed inside UML. It's available from the download - page in the Jail + http://user-mode-linux.sourceforge.net/old/dl-sf.html page in the Jail Filesystems section. From patchwork Mon Feb 10 06:02:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372601 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E4B2D92A for ; Mon, 10 Feb 2020 06:04:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BBEC721927 for ; Mon, 10 Feb 2020 06:04:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314653; bh=beB/Xq2e5ZYKWruejeXMEAdqwZVMoHtzTi2sV7PiNOs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=T0i4LNkPku9yRAhNixfSPSVqqiNCPaKqO4lOMM2xwBqGArExNjmd+oCYj9ZtL/8Go Ui9OGUG2jOTY6TLwKCOV6jUZrE8v5xqLYdg+0GLyUA2AIXPTqT4eupGo8L0PxADZRG iQRncj36kfpVWJEs0Vuxe9i7I0ep/FtaHNFntmcM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727802AbgBJGEK (ORCPT ); Mon, 10 Feb 2020 01:04:10 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36286 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726376AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=VDWufxS1v8YBATfJuGUc8vM6jGy82+VrkVyMthw2XNA=; b=g6FpWmZvYn4j+gzfOlrxqCU77m MnHEEgBSSLDmR08Pp5ZU49/KqtejgFB4bVsXJnSo8jctvAiqgp0HHZ8Cxx+OqIXKEQ/b9VjMlJi4M 07Rb9orVO9zRaRedJhEuIbSXrTgDOCGrah63jEho/d8hVpYKJN8z4ljKpbWIrhJQCP+61SS3GnVeP U61T2MFDVQGdZktt8e33Umjyw/oZjq3Xi7KiIM6LoGYEGrHpjc7OUEWlRN9qk59jtC7i9WbMp9wy0 QWYMwi+i1hYekAkA71IsXftKEF7qpzokgrWDDv0pJtdvLkVglkLvhcGRusoemkwm6AtsmGLGkrxYi hr04jZMw==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tf-II; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A1-00C2Ux-Sx; Mon, 10 Feb 2020 07:03:09 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, Cornelia Huck Subject: [PATCH 05/28] docs: virt: convert halt-polling.txt to ReST format Date: Mon, 10 Feb 2020 07:02:43 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Fix document title to match ReST format - Convert the table to be properly recognized - Some indentation fixes to match ReST syntax. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Cornelia Huck --- .../{halt-polling.txt => halt-polling.rst} | 86 ++++++++++--------- Documentation/virt/kvm/index.rst | 1 + 2 files changed, 46 insertions(+), 41 deletions(-) rename Documentation/virt/kvm/{halt-polling.txt => halt-polling.rst} (64%) diff --git a/Documentation/virt/kvm/halt-polling.txt b/Documentation/virt/kvm/halt-polling.rst similarity index 64% rename from Documentation/virt/kvm/halt-polling.txt rename to Documentation/virt/kvm/halt-polling.rst index 4f791b128dd2..4922e4a15f18 100644 --- a/Documentation/virt/kvm/halt-polling.txt +++ b/Documentation/virt/kvm/halt-polling.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=========================== The KVM halt polling system =========================== @@ -68,7 +71,8 @@ steady state polling interval but will only really do a good job for wakeups which come at an approximately constant rate, otherwise there will be constant adjustment of the polling interval. -[0] total block time: the time between when the halt polling function is +[0] total block time: + the time between when the halt polling function is invoked and a wakeup source received (irrespective of whether the scheduler is invoked within that function). @@ -81,31 +85,32 @@ shrunk. These variables are defined in include/linux/kvm_host.h and as module parameters in virt/kvm/kvm_main.c, or arch/powerpc/kvm/book3s_hv.c in the powerpc kvm-hv case. -Module Parameter | Description | Default Value --------------------------------------------------------------------------------- -halt_poll_ns | The global max polling | KVM_HALT_POLL_NS_DEFAULT - | interval which defines | - | the ceiling value of the | - | polling interval for | (per arch value) - | each vcpu. | --------------------------------------------------------------------------------- -halt_poll_ns_grow | The value by which the | 2 - | halt polling interval is | - | multiplied in the | - | grow_halt_poll_ns() | - | function. | --------------------------------------------------------------------------------- -halt_poll_ns_grow_start | The initial value to grow | 10000 - | to from zero in the | - | grow_halt_poll_ns() | - | function. | --------------------------------------------------------------------------------- -halt_poll_ns_shrink | The value by which the | 0 - | halt polling interval is | - | divided in the | - | shrink_halt_poll_ns() | - | function. | --------------------------------------------------------------------------------- ++-----------------------+---------------------------+-------------------------+ +|Module Parameter | Description | Default Value | ++-----------------------+---------------------------+-------------------------+ +|halt_poll_ns | The global max polling | KVM_HALT_POLL_NS_DEFAULT| +| | interval which defines | | +| | the ceiling value of the | | +| | polling interval for | (per arch value) | +| | each vcpu. | | ++-----------------------+---------------------------+-------------------------+ +|halt_poll_ns_grow | The value by which the | 2 | +| | halt polling interval is | | +| | multiplied in the | | +| | grow_halt_poll_ns() | | +| | function. | | ++-----------------------+---------------------------+-------------------------+ +|halt_poll_ns_grow_start| The initial value to grow | 10000 | +| | to from zero in the | | +| | grow_halt_poll_ns() | | +| | function. | | ++-----------------------+---------------------------+-------------------------+ +|halt_poll_ns_shrink | The value by which the | 0 | +| | halt polling interval is | | +| | divided in the | | +| | shrink_halt_poll_ns() | | +| | function. | | ++-----------------------+---------------------------+-------------------------+ These module parameters can be set from the debugfs files in: @@ -117,20 +122,19 @@ Note: that these module parameters are system wide values and are not able to Further Notes ============= -- Care should be taken when setting the halt_poll_ns module parameter as a -large value has the potential to drive the cpu usage to 100% on a machine which -would be almost entirely idle otherwise. This is because even if a guest has -wakeups during which very little work is done and which are quite far apart, if -the period is shorter than the global max polling interval (halt_poll_ns) then -the host will always poll for the entire block time and thus cpu utilisation -will go to 100%. +- Care should be taken when setting the halt_poll_ns module parameter as a large value + has the potential to drive the cpu usage to 100% on a machine which would be almost + entirely idle otherwise. This is because even if a guest has wakeups during which very + little work is done and which are quite far apart, if the period is shorter than the + global max polling interval (halt_poll_ns) then the host will always poll for the + entire block time and thus cpu utilisation will go to 100%. -- Halt polling essentially presents a trade off between power usage and latency -and the module parameters should be used to tune the affinity for this. Idle -cpu time is essentially converted to host kernel time with the aim of decreasing -latency when entering the guest. +- Halt polling essentially presents a trade off between power usage and latency and + the module parameters should be used to tune the affinity for this. Idle cpu time is + essentially converted to host kernel time with the aim of decreasing latency when + entering the guest. -- Halt polling will only be conducted by the host when no other tasks are -runnable on that cpu, otherwise the polling will cease immediately and -schedule will be invoked to allow that other task to run. Thus this doesn't -allow a guest to denial of service the cpu. +- Halt polling will only be conducted by the host when no other tasks are runnable on + that cpu, otherwise the polling will cease immediately and schedule will be invoked to + allow that other task to run. Thus this doesn't allow a guest to denial of service the + cpu. diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index 488c6370a447..b39f4894b61d 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -9,6 +9,7 @@ KVM amd-memory-encryption cpuid + halt-polling vcpu-requests arm/index From patchwork Mon Feb 10 06:02:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372597 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AC84214B4 for ; Mon, 10 Feb 2020 06:04:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8ADDE22464 for ; Mon, 10 Feb 2020 06:04:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314651; bh=CyGNxVjzir9kuH2VLQn0LMWhQenChWL3R72MZl3SISQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yEYFYQ2rzdYWZ1PZW75nOnGFKmbGoSI+E3WkJ74oAqsl80o/fEICImoHjO1Qv0l0j QXZgFKMSQYm2B8XGjsJ7pg0uMpytcpkl3mEC1tQOw+bMNzrloJAO+WK5W71ikA1f6f u4RQReC3QYdkw2siYk7L60vZzNosSqz1rtLHvPNw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727821AbgBJGEK (ORCPT ); Mon, 10 Feb 2020 01:04:10 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36288 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727435AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=+ryQXThK+1JUVV4yzJL6CFcmCQNGKVDBk28FWUEG9JU=; b=Yi+hmIR6fwCxX7btzCWba9hjmg PJ9gwk3hoJQl/tL4nisIUvpWG2xadzcaNceYGDRRNSeoig4YSY8+2P3m+eN8Q0gHTLSaCwqhpbL9C S99XGXOU3603i/HCV9TIGeehx5d+/Kf+ywmQkLEqfHhagiTDA7J/+S+xwlzdJdqNjf/PUlBedGBOU ZI+CrTLT2vgV5Q7xGkAqMgldHrlDCAt98Nmeg1waCbP4X2yFyetQdVPoUnYw2PBcAWBLYeZEWq1pz eqbLXk+k0p67Zl4t9dQUW49PizUQY8I0gGSpYqPDawPKjwh+1/jvo+5flhrTU0BpoTv4Ti1gk+ifw zmpYMhTQ==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tg-JE; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A1-00C2V1-U4; Mon, 10 Feb 2020 07:03:09 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 06/28] docs: virt: Convert msr.txt to ReST format Date: Mon, 10 Feb 2020 07:02:44 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use document title markup; - Convert tables; - Add blank lines and adjust indentation. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/index.rst | 1 + Documentation/virt/kvm/{msr.txt => msr.rst} | 147 ++++++++++++-------- 2 files changed, 93 insertions(+), 55 deletions(-) rename Documentation/virt/kvm/{msr.txt => msr.rst} (74%) diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index b39f4894b61d..cc6dde47b267 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -10,6 +10,7 @@ KVM amd-memory-encryption cpuid halt-polling + msr vcpu-requests arm/index diff --git a/Documentation/virt/kvm/msr.txt b/Documentation/virt/kvm/msr.rst similarity index 74% rename from Documentation/virt/kvm/msr.txt rename to Documentation/virt/kvm/msr.rst index df1f4338b3ca..33892036672d 100644 --- a/Documentation/virt/kvm/msr.txt +++ b/Documentation/virt/kvm/msr.rst @@ -1,6 +1,10 @@ -KVM-specific MSRs. -Glauber Costa , Red Hat Inc, 2010 -===================================================== +.. SPDX-License-Identifier: GPL-2.0 + +================= +KVM-specific MSRs +================= + +:Author: Glauber Costa , Red Hat Inc, 2010 KVM makes use of some custom MSRs to service some requests. @@ -9,34 +13,39 @@ Custom MSRs have a range reserved for them, that goes from but they are deprecated and their use is discouraged. Custom MSR list --------- +--------------- The current supported Custom MSR list is: -MSR_KVM_WALL_CLOCK_NEW: 0x4b564d00 +MSR_KVM_WALL_CLOCK_NEW: + 0x4b564d00 - data: 4-byte alignment physical address of a memory area which must be +data: + 4-byte alignment physical address of a memory area which must be in guest RAM. This memory is expected to hold a copy of the following - structure: + structure:: - struct pvclock_wall_clock { + struct pvclock_wall_clock { u32 version; u32 sec; u32 nsec; - } __attribute__((__packed__)); + } __attribute__((__packed__)); whose data will be filled in by the hypervisor. The hypervisor is only guaranteed to update this data at the moment of MSR write. Users that want to reliably query this information more than once have to write more than once to this MSR. Fields have the following meanings: - version: guest has to check version before and after grabbing + version: + guest has to check version before and after grabbing time information and check that they are both equal and even. An odd version indicates an in-progress update. - sec: number of seconds for wallclock at time of boot. + sec: + number of seconds for wallclock at time of boot. - nsec: number of nanoseconds for wallclock at time of boot. + nsec: + number of nanoseconds for wallclock at time of boot. In order to get the current wallclock time, the system_time from MSR_KVM_SYSTEM_TIME_NEW needs to be added. @@ -47,13 +56,15 @@ MSR_KVM_WALL_CLOCK_NEW: 0x4b564d00 Availability of this MSR must be checked via bit 3 in 0x4000001 cpuid leaf prior to usage. -MSR_KVM_SYSTEM_TIME_NEW: 0x4b564d01 +MSR_KVM_SYSTEM_TIME_NEW: + 0x4b564d01 - data: 4-byte aligned physical address of a memory area which must be in +data: + 4-byte aligned physical address of a memory area which must be in guest RAM, plus an enable bit in bit 0. This memory is expected to hold - a copy of the following structure: + a copy of the following structure:: - struct pvclock_vcpu_time_info { + struct pvclock_vcpu_time_info { u32 version; u32 pad0; u64 tsc_timestamp; @@ -62,7 +73,7 @@ MSR_KVM_SYSTEM_TIME_NEW: 0x4b564d01 s8 tsc_shift; u8 flags; u8 pad[2]; - } __attribute__((__packed__)); /* 32 bytes */ + } __attribute__((__packed__)); /* 32 bytes */ whose data will be filled in by the hypervisor periodically. Only one write, or registration, is needed for each VCPU. The interval between @@ -72,23 +83,28 @@ MSR_KVM_SYSTEM_TIME_NEW: 0x4b564d01 Fields have the following meanings: - version: guest has to check version before and after grabbing + version: + guest has to check version before and after grabbing time information and check that they are both equal and even. An odd version indicates an in-progress update. - tsc_timestamp: the tsc value at the current VCPU at the time + tsc_timestamp: + the tsc value at the current VCPU at the time of the update of this structure. Guests can subtract this value from current tsc to derive a notion of elapsed time since the structure update. - system_time: a host notion of monotonic time, including sleep + system_time: + a host notion of monotonic time, including sleep time at the time this structure was last updated. Unit is nanoseconds. - tsc_to_system_mul: multiplier to be used when converting + tsc_to_system_mul: + multiplier to be used when converting tsc-related quantity to nanoseconds - tsc_shift: shift to be used when converting tsc-related + tsc_shift: + shift to be used when converting tsc-related quantity to nanoseconds. This shift will ensure that multiplication with tsc_to_system_mul does not overflow. A positive value denotes a left shift, a negative value @@ -96,7 +112,7 @@ MSR_KVM_SYSTEM_TIME_NEW: 0x4b564d01 The conversion from tsc to nanoseconds involves an additional right shift by 32 bits. With this information, guests can - derive per-CPU time by doing: + derive per-CPU time by doing:: time = (current_tsc - tsc_timestamp) if (tsc_shift >= 0) @@ -106,29 +122,34 @@ MSR_KVM_SYSTEM_TIME_NEW: 0x4b564d01 time = (time * tsc_to_system_mul) >> 32 time = time + system_time - flags: bits in this field indicate extended capabilities + flags: + bits in this field indicate extended capabilities coordinated between the guest and the hypervisor. Availability of specific flags has to be checked in 0x40000001 cpuid leaf. Current flags are: - flag bit | cpuid bit | meaning - ------------------------------------------------------------- - | | time measures taken across - 0 | 24 | multiple cpus are guaranteed to - | | be monotonic - ------------------------------------------------------------- - | | guest vcpu has been paused by - 1 | N/A | the host - | | See 4.70 in api.txt - ------------------------------------------------------------- + + +-----------+--------------+----------------------------------+ + | flag bit | cpuid bit | meaning | + +-----------+--------------+----------------------------------+ + | | | time measures taken across | + | 0 | 24 | multiple cpus are guaranteed to | + | | | be monotonic | + +-----------+--------------+----------------------------------+ + | | | guest vcpu has been paused by | + | 1 | N/A | the host | + | | | See 4.70 in api.txt | + +-----------+--------------+----------------------------------+ Availability of this MSR must be checked via bit 3 in 0x4000001 cpuid leaf prior to usage. -MSR_KVM_WALL_CLOCK: 0x11 +MSR_KVM_WALL_CLOCK: + 0x11 - data and functioning: same as MSR_KVM_WALL_CLOCK_NEW. Use that instead. +data and functioning: + same as MSR_KVM_WALL_CLOCK_NEW. Use that instead. This MSR falls outside the reserved KVM range and may be removed in the future. Its usage is deprecated. @@ -136,9 +157,11 @@ MSR_KVM_WALL_CLOCK: 0x11 Availability of this MSR must be checked via bit 0 in 0x4000001 cpuid leaf prior to usage. -MSR_KVM_SYSTEM_TIME: 0x12 +MSR_KVM_SYSTEM_TIME: + 0x12 - data and functioning: same as MSR_KVM_SYSTEM_TIME_NEW. Use that instead. +data and functioning: + same as MSR_KVM_SYSTEM_TIME_NEW. Use that instead. This MSR falls outside the reserved KVM range and may be removed in the future. Its usage is deprecated. @@ -146,7 +169,7 @@ MSR_KVM_SYSTEM_TIME: 0x12 Availability of this MSR must be checked via bit 0 in 0x4000001 cpuid leaf prior to usage. - The suggested algorithm for detecting kvmclock presence is then: + The suggested algorithm for detecting kvmclock presence is then:: if (!kvm_para_available()) /* refer to cpuid.txt */ return NON_PRESENT; @@ -163,8 +186,11 @@ MSR_KVM_SYSTEM_TIME: 0x12 } else return NON_PRESENT; -MSR_KVM_ASYNC_PF_EN: 0x4b564d02 - data: Bits 63-6 hold 64-byte aligned physical address of a +MSR_KVM_ASYNC_PF_EN: + 0x4b564d02 + +data: + Bits 63-6 hold 64-byte aligned physical address of a 64 byte memory area which must be in guest RAM and must be zeroed. Bits 5-3 are reserved and should be zero. Bit 0 is 1 when asynchronous page faults are enabled on the vcpu 0 when @@ -200,20 +226,22 @@ MSR_KVM_ASYNC_PF_EN: 0x4b564d02 Currently type 2 APF will be always delivered on the same vcpu as type 1 was, but guest should not rely on that. -MSR_KVM_STEAL_TIME: 0x4b564d03 +MSR_KVM_STEAL_TIME: + 0x4b564d03 - data: 64-byte alignment physical address of a memory area which must be +data: + 64-byte alignment physical address of a memory area which must be in guest RAM, plus an enable bit in bit 0. This memory is expected to - hold a copy of the following structure: + hold a copy of the following structure:: - struct kvm_steal_time { + struct kvm_steal_time { __u64 steal; __u32 version; __u32 flags; __u8 preempted; __u8 u8_pad[3]; __u32 pad[11]; - } + } whose data will be filled in by the hypervisor periodically. Only one write, or registration, is needed for each VCPU. The interval between @@ -224,25 +252,32 @@ MSR_KVM_STEAL_TIME: 0x4b564d03 Fields have the following meanings: - version: a sequence counter. In other words, guest has to check + version: + a sequence counter. In other words, guest has to check this field before and after grabbing time information and make sure they are both equal and even. An odd version indicates an in-progress update. - flags: At this point, always zero. May be used to indicate + flags: + At this point, always zero. May be used to indicate changes in this structure in the future. - steal: the amount of time in which this vCPU did not run, in + steal: + the amount of time in which this vCPU did not run, in nanoseconds. Time during which the vcpu is idle, will not be reported as steal time. - preempted: indicate the vCPU who owns this struct is running or + preempted: + indicate the vCPU who owns this struct is running or not. Non-zero values mean the vCPU has been preempted. Zero means the vCPU is not preempted. NOTE, it is always zero if the the hypervisor doesn't support this field. -MSR_KVM_EOI_EN: 0x4b564d04 - data: Bit 0 is 1 when PV end of interrupt is enabled on the vcpu; 0 +MSR_KVM_EOI_EN: + 0x4b564d04 + +data: + Bit 0 is 1 when PV end of interrupt is enabled on the vcpu; 0 when disabled. Bit 1 is reserved and must be zero. When PV end of interrupt is enabled (bit 0 set), bits 63-2 hold a 4-byte aligned physical address of a 4 byte memory area which must be in guest RAM and @@ -274,11 +309,13 @@ MSR_KVM_EOI_EN: 0x4b564d04 clear it using a single CPU instruction, such as test and clear, or compare and exchange. -MSR_KVM_POLL_CONTROL: 0x4b564d05 +MSR_KVM_POLL_CONTROL: + 0x4b564d05 + Control host-side polling. - data: Bit 0 enables (1) or disables (0) host-side HLT polling logic. +data: + Bit 0 enables (1) or disables (0) host-side HLT polling logic. KVM guests can request the host not to poll on HLT, for example if they are performing polling themselves. - From patchwork Mon Feb 10 06:02:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372563 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9229814B4 for ; Mon, 10 Feb 2020 06:03:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 680702465A for ; Mon, 10 Feb 2020 06:03:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314629; bh=26XWohbvf1dFJnASIhrI39ry8dzG3bIydopHdksDxz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FugKRBQBQjyugd3cqjMtIbTZCXndk283VWxmnNnkJ5tZjEH8hZShfMO1DZO8CaC+M r0DTHLVSaxLx6TLT7vYYpz0vVhoOQuGejXapt2yjjuN1uR/X3mN7fPKy95Mj6dURVN Mcgb/Id9oGpZ2I98l/GiXFyQIN3C8ub04FLvalRg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727795AbgBJGDs (ORCPT ); Mon, 10 Feb 2020 01:03:48 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36300 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727477AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=Q0ByLN+MT5oQ7WLNRqLDh/71ln8CBqGELV7pKOMFo6g=; b=eHkqLulx2U1PU3oF/9qlHc1O3d 5J2kzOu92oaE6N/10ILud+Ksy4Yo2HrVmJ7Yv7RcrpXJe+TaQNnj6jzN6dIlRqc0Jiw6oaeZ6Sg2y tOivvDxjidK2h0EUvJ4MB0n+zwBeTENLLP0GWKsff79UYEv1iv8tj968V4C6fDWIDHFPoKZJh06BT DsMH8nK9sMSq1IVeQTRPic4m2gQXZWOpqNZ9lxBGnUNokhBU8KwZue0KcJSDKM5AIuDXy8tN6igKB Z3H+BBwAkBFxuTYNozGNvXXKW6WariQUIALIPKItOM0BemHTYeGARGW7v/GmwDEJLJ+lMAen34o9y 0UdX7i/Q==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Th-K4; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A1-00C2V7-V3; Mon, 10 Feb 2020 07:03:09 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 07/28] docs: kvm: devices/arm-vgic-its.txt to ReST format Date: Mon, 10 Feb 2020 07:02:45 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Fix document title to match ReST format - Convert the table to be properly recognized - use proper markups for literal blocks - Some indentation fixes to match ReST While here, add an index for kvm devices. Signed-off-by: Mauro Carvalho Chehab --- .../{arm-vgic-its.txt => arm-vgic-its.rst} | 106 +++++++++++------- Documentation/virt/kvm/devices/index.rst | 10 ++ Documentation/virt/kvm/index.rst | 1 + 3 files changed, 78 insertions(+), 39 deletions(-) rename Documentation/virt/kvm/devices/{arm-vgic-its.txt => arm-vgic-its.rst} (71%) create mode 100644 Documentation/virt/kvm/devices/index.rst diff --git a/Documentation/virt/kvm/devices/arm-vgic-its.txt b/Documentation/virt/kvm/devices/arm-vgic-its.rst similarity index 71% rename from Documentation/virt/kvm/devices/arm-vgic-its.txt rename to Documentation/virt/kvm/devices/arm-vgic-its.rst index eeaa95b893a8..6c304fd2b1b4 100644 --- a/Documentation/virt/kvm/devices/arm-vgic-its.txt +++ b/Documentation/virt/kvm/devices/arm-vgic-its.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=============================================== ARM Virtual Interrupt Translation Service (ITS) =============================================== @@ -12,22 +15,32 @@ There can be multiple ITS controllers per guest, each of them has to have a separate, non-overlapping MMIO region. -Groups: - KVM_DEV_ARM_VGIC_GRP_ADDR +Groups +====== + +KVM_DEV_ARM_VGIC_GRP_ADDR +------------------------- + Attributes: KVM_VGIC_ITS_ADDR_TYPE (rw, 64-bit) Base address in the guest physical address space of the GICv3 ITS control register frame. This address needs to be 64K aligned and the region covers 128K. + Errors: - -E2BIG: Address outside of addressable IPA range - -EINVAL: Incorrectly aligned address - -EEXIST: Address already configured - -EFAULT: Invalid user pointer for attr->addr. - -ENODEV: Incorrect attribute or the ITS is not supported. + ======= ================================================= + -E2BIG Address outside of addressable IPA range + -EINVAL Incorrectly aligned address + -EEXIST Address already configured + -EFAULT Invalid user pointer for attr->addr. + -ENODEV Incorrect attribute or the ITS is not supported. + ======= ================================================= + + +KVM_DEV_ARM_VGIC_GRP_CTRL +------------------------- - KVM_DEV_ARM_VGIC_GRP_CTRL Attributes: KVM_DEV_ARM_VGIC_CTRL_INIT request the initialization of the ITS, no additional parameter in @@ -58,16 +71,21 @@ Groups: "ITS Restore Sequence". Errors: - -ENXIO: ITS not properly configured as required prior to setting + + ======= ========================================================== + -ENXIO ITS not properly configured as required prior to setting this attribute - -ENOMEM: Memory shortage when allocating ITS internal data - -EINVAL: Inconsistent restored data - -EFAULT: Invalid guest ram access - -EBUSY: One or more VCPUS are running - -EACCES: The virtual ITS is backed by a physical GICv4 ITS, and the + -ENOMEM Memory shortage when allocating ITS internal data + -EINVAL Inconsistent restored data + -EFAULT Invalid guest ram access + -EBUSY One or more VCPUS are running + -EACCES The virtual ITS is backed by a physical GICv4 ITS, and the state is not available + ======= ========================================================== + +KVM_DEV_ARM_VGIC_GRP_ITS_REGS +----------------------------- - KVM_DEV_ARM_VGIC_GRP_ITS_REGS Attributes: The attr field of kvm_device_attr encodes the offset of the ITS register, relative to the ITS control frame base address @@ -78,6 +96,7 @@ Groups: be accessed with full length. Writes to read-only registers are ignored by the kernel except for: + - GITS_CREADR. It must be restored otherwise commands in the queue will be re-executed after restoring CWRITER. GITS_CREADR must be restored before restoring the GITS_CTLR which is likely to enable the @@ -91,30 +110,36 @@ Groups: For other registers, getting or setting a register has the same effect as reading/writing the register on real hardware. + Errors: - -ENXIO: Offset does not correspond to any supported register - -EFAULT: Invalid user pointer for attr->addr - -EINVAL: Offset is not 64-bit aligned - -EBUSY: one or more VCPUS are running - ITS Restore Sequence: - ------------------------- + ======= ==================================================== + -ENXIO Offset does not correspond to any supported register + -EFAULT Invalid user pointer for attr->addr + -EINVAL Offset is not 64-bit aligned + -EBUSY one or more VCPUS are running + ======= ==================================================== + +ITS Restore Sequence: +--------------------- The following ordering must be followed when restoring the GIC and the ITS: + a) restore all guest memory and create vcpus b) restore all redistributors c) provide the ITS base address (KVM_DEV_ARM_VGIC_GRP_ADDR) d) restore the ITS in the following order: - 1. Restore GITS_CBASER - 2. Restore all other GITS_ registers, except GITS_CTLR! - 3. Load the ITS table data (KVM_DEV_ARM_ITS_RESTORE_TABLES) - 4. Restore GITS_CTLR + + 1. Restore GITS_CBASER + 2. Restore all other ``GITS_`` registers, except GITS_CTLR! + 3. Load the ITS table data (KVM_DEV_ARM_ITS_RESTORE_TABLES) + 4. Restore GITS_CTLR Then vcpus can be started. - ITS Table ABI REV0: - ------------------- +ITS Table ABI REV0: +------------------- Revision 0 of the ABI only supports the features of a virtual GICv3, and does not support a virtual GICv4 with support for direct injection of virtual @@ -125,12 +150,13 @@ Then vcpus can be started. entries in the collection are listed in no particular order. All entries are 8 bytes. - Device Table Entry (DTE): + Device Table Entry (DTE):: - bits: | 63| 62 ... 49 | 48 ... 5 | 4 ... 0 | - values: | V | next | ITT_addr | Size | + bits: | 63| 62 ... 49 | 48 ... 5 | 4 ... 0 | + values: | V | next | ITT_addr | Size | + + where: - where; - V indicates whether the entry is valid. If not, other fields are not meaningful. - next: equals to 0 if this entry is the last one; otherwise it @@ -140,32 +166,34 @@ Then vcpus can be started. - Size specifies the supported number of bits for the EventID, minus one - Collection Table Entry (CTE): + Collection Table Entry (CTE):: - bits: | 63| 62 .. 52 | 51 ... 16 | 15 ... 0 | - values: | V | RES0 | RDBase | ICID | + bits: | 63| 62 .. 52 | 51 ... 16 | 15 ... 0 | + values: | V | RES0 | RDBase | ICID | where: + - V indicates whether the entry is valid. If not, other fields are not meaningful. - RES0: reserved field with Should-Be-Zero-or-Preserved behavior. - RDBase is the PE number (GICR_TYPER.Processor_Number semantic), - ICID is the collection ID - Interrupt Translation Entry (ITE): + Interrupt Translation Entry (ITE):: - bits: | 63 ... 48 | 47 ... 16 | 15 ... 0 | - values: | next | pINTID | ICID | + bits: | 63 ... 48 | 47 ... 16 | 15 ... 0 | + values: | next | pINTID | ICID | where: + - next: equals to 0 if this entry is the last one; otherwise it corresponds to the EventID offset to the next ITE capped by 2^16 -1. - pINTID is the physical LPI ID; if zero, it means the entry is not valid and other fields are not meaningful. - ICID is the collection ID - ITS Reset State: - ---------------- +ITS Reset State: +---------------- RESET returns the ITS to the same state that it was when first created and initialized. When the RESET command returns, the following things are diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst new file mode 100644 index 000000000000..2aad8d426097 --- /dev/null +++ b/Documentation/virt/kvm/devices/index.rst @@ -0,0 +1,10 @@ +.. SPDX-License-Identifier: GPL-2.0 + +======= +Devices +======= + +.. toctree:: + :maxdepth: 2 + + arm-vgic-its diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index cc6dde47b267..24d1076ec680 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -14,3 +14,4 @@ KVM vcpu-requests arm/index + devices/index From patchwork Mon Feb 10 06:02:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372561 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 96F0317F0 for ; Mon, 10 Feb 2020 06:03:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6986521927 for ; Mon, 10 Feb 2020 06:03:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314628; bh=cXBiFcaxvHE+98Do6xllRMxiS/qjPczxvEaHrAOu1F4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=C00m6jza9gJswlefyJmw0oy/6V3hbMlIoVTDCQ3rIRyxka732vtBBs7SyyMv4P1TJ EhwQXdLzc3GPBJQ86/OAfLW8zHeruNyFNbHfjnIvKj3Qpxg+i1aJEUgFRePdb0M1sG PYszfYnJPclPGYPA3A5mTe0vsnDZbpcE/pbn83jA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727791AbgBJGDr (ORCPT ); Mon, 10 Feb 2020 01:03:47 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36308 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727484AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=StBmkMxpMbI9C0C6LmmaNenTUA0wCJe7d2Ea3f4QLvQ=; b=W0IkyH58lX6Hj51tm4RaUJPqS4 7m2REERfu9k2dx1olH67UuqRMwXIe3UUMI3P77HSp2VlObdTqBULi6Q41xzMc3w6KyGOR75teBhQC AZGJNsg5FLCxn3rF3otObLGDp/q8Vwr3ZtuOj9hr/yXKefa6xMPVy0KHdZFKPfiP+jhq03git9zDV vpkOfpEPYIDgf++PKCcuk+SB3taFrcLjoklgjYO6VgAkffA0v6aqg9kugxG0XIy6oY1PjzZyinoKK V0rIIpjT7faLsgUh7dIYOyMuNJkflRO6XRefecmRKXO3vZhf34Rygii55daE3vSyUe381KGlLpISB 4F4/tZgg==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Ti-Lj; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2VC-0M; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 08/28] docs: kvm: devices/arm-vgit-v3.txt to ReST Date: Mon, 10 Feb 2020 07:02:46 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use title markups; - change indent to match ReST syntax; - use proper table markups; - use literal block markups. Signed-off-by: Mauro Carvalho Chehab --- .../{arm-vgic-v3.txt => arm-vgic-v3.rst} | 132 ++++++++++++------ Documentation/virt/kvm/devices/index.rst | 1 + 2 files changed, 87 insertions(+), 46 deletions(-) rename Documentation/virt/kvm/devices/{arm-vgic-v3.txt => arm-vgic-v3.rst} (77%) diff --git a/Documentation/virt/kvm/devices/arm-vgic-v3.txt b/Documentation/virt/kvm/devices/arm-vgic-v3.rst similarity index 77% rename from Documentation/virt/kvm/devices/arm-vgic-v3.txt rename to Documentation/virt/kvm/devices/arm-vgic-v3.rst index ff290b43c8e5..5dd3bff51978 100644 --- a/Documentation/virt/kvm/devices/arm-vgic-v3.txt +++ b/Documentation/virt/kvm/devices/arm-vgic-v3.rst @@ -1,9 +1,12 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================================== ARM Virtual Generic Interrupt Controller v3 and later (VGICv3) ============================================================== Device types supported: - KVM_DEV_TYPE_ARM_VGIC_V3 ARM Generic Interrupt Controller v3.0 + - KVM_DEV_TYPE_ARM_VGIC_V3 ARM Generic Interrupt Controller v3.0 Only one VGIC instance may be instantiated through this API. The created VGIC will act as the VM interrupt controller, requiring emulated user-space devices @@ -15,7 +18,8 @@ Creating a guest GICv3 device requires a host GICv3 as well. Groups: KVM_DEV_ARM_VGIC_GRP_ADDR - Attributes: + Attributes: + KVM_VGIC_V3_ADDR_TYPE_DIST (rw, 64-bit) Base address in the guest physical address space of the GICv3 distributor register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. @@ -29,21 +33,25 @@ Groups: This address needs to be 64K aligned. KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION (rw, 64-bit) - The attribute data pointed to by kvm_device_attr.addr is a __u64 value: - bits: | 63 .... 52 | 51 .... 16 | 15 - 12 |11 - 0 - values: | count | base | flags | index + The attribute data pointed to by kvm_device_attr.addr is a __u64 value:: + + bits: | 63 .... 52 | 51 .... 16 | 15 - 12 |11 - 0 + values: | count | base | flags | index + - index encodes the unique redistributor region index - flags: reserved for future use, currently 0 - base field encodes bits [51:16] of the guest physical base address of the first redistributor in the region. - count encodes the number of redistributors in the region. Must be greater than 0. + There are two 64K pages for each redistributor in the region and redistributors are laid out contiguously within the region. Regions are filled with redistributors in the index order. The sum of all region count fields must be greater than or equal to the number of VCPUs. Redistributor regions must be registered in the incremental index order, starting from index 0. + The characteristics of a specific redistributor region can be read by presetting the index field in the attr data. Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. @@ -52,23 +60,27 @@ Groups: KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attributes. Errors: - -E2BIG: Address outside of addressable IPA range - -EINVAL: Incorrectly aligned address, bad redistributor region + + ======= ============================================================= + -E2BIG Address outside of addressable IPA range + -EINVAL Incorrectly aligned address, bad redistributor region count/index, mixed redistributor region attribute usage - -EEXIST: Address already configured - -ENOENT: Attempt to read the characteristics of a non existing + -EEXIST Address already configured + -ENOENT Attempt to read the characteristics of a non existing redistributor region - -ENXIO: The group or attribute is unknown/unsupported for this device + -ENXIO The group or attribute is unknown/unsupported for this device or hardware support is missing. - -EFAULT: Invalid user pointer for attr->addr. + -EFAULT Invalid user pointer for attr->addr. + ======= ============================================================= - KVM_DEV_ARM_VGIC_GRP_DIST_REGS - KVM_DEV_ARM_VGIC_GRP_REDIST_REGS - Attributes: - The attr field of kvm_device_attr encodes two values: - bits: | 63 .... 32 | 31 .... 0 | - values: | mpidr | offset | + KVM_DEV_ARM_VGIC_GRP_DIST_REGS, KVM_DEV_ARM_VGIC_GRP_REDIST_REGS + Attributes: + + The attr field of kvm_device_attr encodes two values:: + + bits: | 63 .... 32 | 31 .... 0 | + values: | mpidr | offset | All distributor regs are (rw, 32-bit) and kvm_device_attr.addr points to a __u32 value. 64-bit registers must be accessed by separately accessing the @@ -93,7 +105,8 @@ Groups: redistributor is accessed. The mpidr is ignored for the distributor. The mpidr encoding is based on the affinity information in the - architecture defined MPIDR, and the field is encoded as follows: + architecture defined MPIDR, and the field is encoded as follows:: + | 63 .... 56 | 55 .... 48 | 47 .... 40 | 39 .... 32 | | Aff3 | Aff2 | Aff1 | Aff0 | @@ -148,24 +161,30 @@ Groups: ignored. Errors: - -ENXIO: Getting or setting this register is not yet supported - -EBUSY: One or more VCPUs are running + + ====== ===================================================== + -ENXIO Getting or setting this register is not yet supported + -EBUSY One or more VCPUs are running + ====== ===================================================== KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS - Attributes: - The attr field of kvm_device_attr encodes two values: - bits: | 63 .... 32 | 31 .... 16 | 15 .... 0 | - values: | mpidr | RES | instr | + Attributes: + + The attr field of kvm_device_attr encodes two values:: + + bits: | 63 .... 32 | 31 .... 16 | 15 .... 0 | + values: | mpidr | RES | instr | The mpidr field encodes the CPU ID based on the affinity information in the - architecture defined MPIDR, and the field is encoded as follows: + architecture defined MPIDR, and the field is encoded as follows:: + | 63 .... 56 | 55 .... 48 | 47 .... 40 | 39 .... 32 | | Aff3 | Aff2 | Aff1 | Aff0 | The instr field encodes the system register to access based on the fields defined in the A64 instruction set encoding for system register access - (RES means the bits are reserved for future use and should be zero): + (RES means the bits are reserved for future use and should be zero):: | 15 ... 14 | 13 ... 11 | 10 ... 7 | 6 ... 3 | 2 ... 0 | | Op 0 | Op1 | CRn | CRm | Op2 | @@ -178,26 +197,35 @@ Groups: CPU interface registers access is not implemented for AArch32 mode. Error -ENXIO is returned when accessed in AArch32 mode. + Errors: - -ENXIO: Getting or setting this register is not yet supported - -EBUSY: VCPU is running - -EINVAL: Invalid mpidr or register value supplied + + ======= ===================================================== + -ENXIO Getting or setting this register is not yet supported + -EBUSY VCPU is running + -EINVAL Invalid mpidr or register value supplied + ======= ===================================================== KVM_DEV_ARM_VGIC_GRP_NR_IRQS - Attributes: + Attributes: + A value describing the number of interrupts (SGI, PPI and SPI) for this GIC instance, ranging from 64 to 1024, in increments of 32. kvm_device_attr.addr points to a __u32 value. Errors: - -EINVAL: Value set is out of the expected range - -EBUSY: Value has already be set. + + ======= ====================================== + -EINVAL Value set is out of the expected range + -EBUSY Value has already be set. + ======= ====================================== KVM_DEV_ARM_VGIC_GRP_CTRL - Attributes: + Attributes: + KVM_DEV_ARM_VGIC_CTRL_INIT request the initialization of the VGIC, no additional parameter in kvm_device_attr.addr. @@ -205,20 +233,26 @@ Groups: save all LPI pending bits into guest RAM pending tables. The first kB of the pending table is not altered by this operation. + Errors: - -ENXIO: VGIC not properly configured as required prior to calling - this attribute - -ENODEV: no online VCPU - -ENOMEM: memory shortage when allocating vgic internal data - -EFAULT: Invalid guest ram access - -EBUSY: One or more VCPUS are running + + ======= ======================================================== + -ENXIO VGIC not properly configured as required prior to calling + this attribute + -ENODEV no online VCPU + -ENOMEM memory shortage when allocating vgic internal data + -EFAULT Invalid guest ram access + -EBUSY One or more VCPUS are running + ======= ======================================================== KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO - Attributes: - The attr field of kvm_device_attr encodes the following values: - bits: | 63 .... 32 | 31 .... 10 | 9 .... 0 | - values: | mpidr | info | vINTID | + Attributes: + + The attr field of kvm_device_attr encodes the following values:: + + bits: | 63 .... 32 | 31 .... 10 | 9 .... 0 | + values: | mpidr | info | vINTID | The vINTID specifies which set of IRQs is reported on. @@ -228,6 +262,7 @@ Groups: VGIC_LEVEL_INFO_LINE_LEVEL: Get/Set the input level of the IRQ line for a set of 32 contiguously numbered interrupts. + vINTID must be a multiple of 32. kvm_device_attr.addr points to a __u32 value which will contain a @@ -243,9 +278,14 @@ Groups: reported with the same value regardless of the mpidr specified. The mpidr field encodes the CPU ID based on the affinity information in the - architecture defined MPIDR, and the field is encoded as follows: + architecture defined MPIDR, and the field is encoded as follows:: + | 63 .... 56 | 55 .... 48 | 47 .... 40 | 39 .... 32 | | Aff3 | Aff2 | Aff1 | Aff0 | + Errors: - -EINVAL: vINTID is not multiple of 32 or - info field is not VGIC_LEVEL_INFO_LINE_LEVEL + + ======= ============================================= + -EINVAL vINTID is not multiple of 32 or info field is + not VGIC_LEVEL_INFO_LINE_LEVEL + ======= ============================================= diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index 2aad8d426097..80c1e0e225f4 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -8,3 +8,4 @@ Devices :maxdepth: 2 arm-vgic-its + arm-vgic-v3 From patchwork Mon Feb 10 06:02:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372543 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 52BF414B4 for ; Mon, 10 Feb 2020 06:03:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 286EB24656 for ; Mon, 10 Feb 2020 06:03:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314617; bh=GeNTq8Ib30C29iPt/Ha8uLjw7D0/RugAMZJjMF0ErXs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bhzuXdA94e7vxNKRoH7jhK+tAjpFblKCEgPjJdx2m4/TLVPt24pjXmGZScO5nJeqq FUWQyCVpAWdgQym7m9VB+zRFo0wr/1xdA3/RK9OYZMqodbOuIY4U7i2zC2+VS1YAHM sDmDod0VDQjA8IPrfL9S2RWi690oa4nII7fnKsLY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727690AbgBJGDd (ORCPT ); Mon, 10 Feb 2020 01:03:33 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36294 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727436AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=UoVoTfeqJAIn1DpUiVy/iSRc5XPT39jOF0FCEyMWDLs=; b=dV5tIkA3WQzanAgcull5UTsR+I ChuUYSBe1bz5gKlrB9q2wOVKYUaZTF1HxcGyRiRVKRDekvpEt8eQpY8UtzKuOjqU4c94dHKgilt+z gXFAp97JbXpH2mFniBLyue1PJJ3MEtBQUqbtgetSc6Cy9bDSKp+HvrdHge8S3BAA5SDjSHMl7EhqA egRaBMVWMF22I06uZtqazKadnXwLYkr6IhsTlo6CiEQfBXKezOsfGE+FSL8SRP//HmWWevGLyfD/+ 5D4Sl1QdQBUWGB+XitVS3CvpVPxAZ+KG1fgEckG2VUm6o+NinaCnn1WnCPaCHl/2+VTEydwBOXCBR 930j1qaA==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tj-MK; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2VH-1M; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 09/28] docs: kvm: convert devices/arm-vgit.txt to ReST Date: Mon, 10 Feb 2020 07:02:47 +0100 Message-Id: <1a49c2b2088952f56c317f2ec533f45e6801f2b1.1581314317.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use title markups; - change indent to match ReST syntax; - use proper table markups; - use literal block markups. Signed-off-by: Mauro Carvalho Chehab --- .../devices/{arm-vgic.txt => arm-vgic.rst} | 89 ++++++++++++------- Documentation/virt/kvm/devices/index.rst | 1 + 2 files changed, 60 insertions(+), 30 deletions(-) rename Documentation/virt/kvm/devices/{arm-vgic.txt => arm-vgic.rst} (66%) diff --git a/Documentation/virt/kvm/devices/arm-vgic.txt b/Documentation/virt/kvm/devices/arm-vgic.rst similarity index 66% rename from Documentation/virt/kvm/devices/arm-vgic.txt rename to Documentation/virt/kvm/devices/arm-vgic.rst index 97b6518148f8..40bdeea1d86e 100644 --- a/Documentation/virt/kvm/devices/arm-vgic.txt +++ b/Documentation/virt/kvm/devices/arm-vgic.rst @@ -1,8 +1,12 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================================================== ARM Virtual Generic Interrupt Controller v2 (VGIC) ================================================== Device types supported: - KVM_DEV_TYPE_ARM_VGIC_V2 ARM Generic Interrupt Controller v2.0 + + - KVM_DEV_TYPE_ARM_VGIC_V2 ARM Generic Interrupt Controller v2.0 Only one VGIC instance may be instantiated through either this API or the legacy KVM_CREATE_IRQCHIP API. The created VGIC will act as the VM interrupt @@ -17,7 +21,8 @@ create both a GICv3 and GICv2 device on the same VM. Groups: KVM_DEV_ARM_VGIC_GRP_ADDR - Attributes: + Attributes: + KVM_VGIC_V2_ADDR_TYPE_DIST (rw, 64-bit) Base address in the guest physical address space of the GIC distributor register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V2. @@ -27,19 +32,25 @@ Groups: Base address in the guest physical address space of the GIC virtual cpu interface register mappings. Only valid for KVM_DEV_TYPE_ARM_VGIC_V2. This address needs to be 4K aligned and the region covers 4 KByte. + Errors: - -E2BIG: Address outside of addressable IPA range - -EINVAL: Incorrectly aligned address - -EEXIST: Address already configured - -ENXIO: The group or attribute is unknown/unsupported for this device + + ======= ============================================================= + -E2BIG Address outside of addressable IPA range + -EINVAL Incorrectly aligned address + -EEXIST Address already configured + -ENXIO The group or attribute is unknown/unsupported for this device or hardware support is missing. - -EFAULT: Invalid user pointer for attr->addr. + -EFAULT Invalid user pointer for attr->addr. + ======= ============================================================= KVM_DEV_ARM_VGIC_GRP_DIST_REGS - Attributes: - The attr field of kvm_device_attr encodes two values: - bits: | 63 .... 40 | 39 .. 32 | 31 .... 0 | - values: | reserved | vcpu_index | offset | + Attributes: + + The attr field of kvm_device_attr encodes two values:: + + bits: | 63 .... 40 | 39 .. 32 | 31 .... 0 | + values: | reserved | vcpu_index | offset | All distributor regs are (rw, 32-bit) @@ -58,16 +69,22 @@ Groups: KVM_DEV_ARM_VGIC_GRP_DIST_REGS and KVM_DEV_ARM_VGIC_GRP_CPU_REGS) to ensure the expected behavior. Unless GICD_IIDR has been set from userspace, writes to the interrupt group registers (GICD_IGROUPR) are ignored. + Errors: - -ENXIO: Getting or setting this register is not yet supported - -EBUSY: One or more VCPUs are running - -EINVAL: Invalid vcpu_index supplied + + ======= ===================================================== + -ENXIO Getting or setting this register is not yet supported + -EBUSY One or more VCPUs are running + -EINVAL Invalid vcpu_index supplied + ======= ===================================================== KVM_DEV_ARM_VGIC_GRP_CPU_REGS - Attributes: - The attr field of kvm_device_attr encodes two values: - bits: | 63 .... 40 | 39 .. 32 | 31 .... 0 | - values: | reserved | vcpu_index | offset | + Attributes: + + The attr field of kvm_device_attr encodes two values:: + + bits: | 63 .... 40 | 39 .. 32 | 31 .... 0 | + values: | reserved | vcpu_index | offset | All CPU interface regs are (rw, 32-bit) @@ -101,27 +118,39 @@ Groups: value left by 3 places to obtain the actual priority mask level. Errors: - -ENXIO: Getting or setting this register is not yet supported - -EBUSY: One or more VCPUs are running - -EINVAL: Invalid vcpu_index supplied + + ======= ===================================================== + -ENXIO Getting or setting this register is not yet supported + -EBUSY One or more VCPUs are running + -EINVAL Invalid vcpu_index supplied + ======= ===================================================== KVM_DEV_ARM_VGIC_GRP_NR_IRQS - Attributes: + Attributes: + A value describing the number of interrupts (SGI, PPI and SPI) for this GIC instance, ranging from 64 to 1024, in increments of 32. Errors: - -EINVAL: Value set is out of the expected range - -EBUSY: Value has already be set, or GIC has already been initialized - with default values. + + ======= ============================================================= + -EINVAL Value set is out of the expected range + -EBUSY Value has already be set, or GIC has already been initialized + with default values. + ======= ============================================================= KVM_DEV_ARM_VGIC_GRP_CTRL - Attributes: + Attributes: + KVM_DEV_ARM_VGIC_CTRL_INIT request the initialization of the VGIC or ITS, no additional parameter in kvm_device_attr.addr. + Errors: - -ENXIO: VGIC not properly configured as required prior to calling - this attribute - -ENODEV: no online VCPU - -ENOMEM: memory shortage when allocating vgic internal data + + ======= ========================================================= + -ENXIO VGIC not properly configured as required prior to calling + this attribute + -ENODEV no online VCPU + -ENOMEM memory shortage when allocating vgic internal data + ======= ========================================================= diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index 80c1e0e225f4..7eabce80c61e 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -8,4 +8,5 @@ Devices :maxdepth: 2 arm-vgic-its + arm-vgic arm-vgic-v3 From patchwork Mon Feb 10 06:02:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372573 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A602992A for ; Mon, 10 Feb 2020 06:03:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 847F224655 for ; Mon, 10 Feb 2020 06:03:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314636; bh=AFD65OKSV1+A0vldGPtU8+SJqCThPuv3WOKajnC2d8U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=h5jEoqmUNRuxeFs3rUnG3lPna9oZtNSEjTihaBQUU7vOGhT4XwcpMvYs5hnpgXzPR 3ZSiv5oaDcCIv4rdFTJONmP1gwSL9WjLs2G8Ildz4eok/SgWQwKbNdKRbY4lxtkJIL 8MVeaI1eAi+wilx3T1mkMNd438cEn5c2n/PxUG70= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727772AbgBJGDq (ORCPT ); Mon, 10 Feb 2020 01:03:46 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36284 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726118AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=0NdNmLSXcScD8m9tuo9ayLdWPmuOQKKz8+PbS3hVgr4=; b=AehLxRuByn2NTpWRzi5Lsrv58y h/vUmObZsTl0oCOSMDZ7nR+ERk8G2IanwYl3gS6H6K9SjIo8tlbiJP7kP4UasDpegSD5e5HdY7Zoo fOGhWepAJsAkEvju3O52baDKzKc9ia80Cvu7TVrHtgg6u7jFU0QkjYQOll/o24H/Iz3vZfDy83Bye sXVglEDV7XiOBn1xGnPZCBR1riVWCNC/A0fzK9zZpz9xZfUN7T36c2/KPhbkonnoILxIPmWzL1irA vc9H0y3+bKFY/Uv3KydPqc09Qaq1zvycGYXokwTmOiuu3iecF/Z1FM/UAB1JrSO3k+ccJFfUz2dfe qwYFlBqw==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tk-ON; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2VM-2I; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 10/28] docs: kvm: convert devices/mpic.txt to ReST Date: Mon, 10 Feb 2020 07:02:48 +0100 Message-Id: <74b5fdc29eb05c3215fd316caeafa88bb4760f7d.1581314317.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This document is almost in ReST format. The only thing needed is to mark a list as such and to add an extra whitespace. Yet, let's also use the standard document title markup, as it makes easier if anyone wants later to add sessions to it. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/devices/index.rst | 1 + Documentation/virt/kvm/devices/{mpic.txt => mpic.rst} | 11 ++++++++--- 2 files changed, 9 insertions(+), 3 deletions(-) rename Documentation/virt/kvm/devices/{mpic.txt => mpic.rst} (91%) diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index 7eabce80c61e..9e5586e371de 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -10,3 +10,4 @@ Devices arm-vgic-its arm-vgic arm-vgic-v3 + mpic diff --git a/Documentation/virt/kvm/devices/mpic.txt b/Documentation/virt/kvm/devices/mpic.rst similarity index 91% rename from Documentation/virt/kvm/devices/mpic.txt rename to Documentation/virt/kvm/devices/mpic.rst index 8257397adc3c..55cefe030d41 100644 --- a/Documentation/virt/kvm/devices/mpic.txt +++ b/Documentation/virt/kvm/devices/mpic.rst @@ -1,9 +1,13 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================= MPIC interrupt controller ========================= Device types supported: - KVM_DEV_TYPE_FSL_MPIC_20 Freescale MPIC v2.0 - KVM_DEV_TYPE_FSL_MPIC_42 Freescale MPIC v4.2 + + - KVM_DEV_TYPE_FSL_MPIC_20 Freescale MPIC v2.0 + - KVM_DEV_TYPE_FSL_MPIC_42 Freescale MPIC v4.2 Only one MPIC instance, of any type, may be instantiated. The created MPIC will act as the system interrupt controller, connecting to each @@ -11,7 +15,8 @@ vcpu's interrupt inputs. Groups: KVM_DEV_MPIC_GRP_MISC - Attributes: + Attributes: + KVM_DEV_MPIC_BASE_ADDR (rw, 64-bit) Base address of the 256 KiB MPIC register space. Must be naturally aligned. A value of zero disables the mapping. From patchwork Mon Feb 10 06:02:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372583 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0CE6B14B4 for ; Mon, 10 Feb 2020 06:04:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DFD2621835 for ; Mon, 10 Feb 2020 06:04:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314642; bh=+clo8FgPb4q70r58fBUH/QXip8iRiCaMaHncrZxi6X8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Wj9KSqyJT9I7XavOeWFDBX881CYPG5PLwLCY0rijA5pmQykof6VUTK66UgOn3arQ9 OsuX0V8fp/ndo5RwbvniLHpFkU4eWXKWOwQopAcvrFt4rnKSkGM8NekX9Ko7QAesfX kD+DOdy+KDlg+LPwEYn4lnyPI0NnRjNoRGl2wPxw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727588AbgBJGEC (ORCPT ); Mon, 10 Feb 2020 01:04:02 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36298 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727452AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=BBkxbTIBsbP281l/EajrQ33Ah82OprSYBCybWSzNyDw=; b=b5Jwqo0+qB14c6m4yKH5cLxWWO ikKj47A59X6UZdqA8msK32dRjhMg66O1WQ0v6mZ/fZ4uebuau5YMcr3eN4Fz1oV4zLbmh8xpUkB7A VQbprGIo36+YFhwzyjK4xpwZxh++EIZ5zNL03NGDRRGqGrH2S/947u7kWPbcUCfm19GyJb+TLLAq8 3IGclq285t53QYfTp4U+sEQzKrqllPzaUKGVZdGd+BOmLjHoOT6IvuV1i2QRZo8OOdFotX4kxesaL why2+v6oXFVATnDr/IkRY6zKnONulYAdC6OV86ej1QBwK4DoHVGbeBXFvcCPIXMVPt9LBpA4qk5/j fYuUUHOw==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tl-P2; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2VR-3P; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, Cornelia Huck Subject: [PATCH 11/28] docs: kvm: convert devices/s390_flic.txt to ReST Date: Mon, 10 Feb 2020 07:02:49 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use standard markup for document title; - Adjust indentation and add blank lines as needed; - use the notes markup; - mark code blocks as such. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Cornelia Huck --- Documentation/virt/kvm/devices/index.rst | 1 + .../devices/{s390_flic.txt => s390_flic.rst} | 70 +++++++++++-------- 2 files changed, 41 insertions(+), 30 deletions(-) rename Documentation/virt/kvm/devices/{s390_flic.txt => s390_flic.rst} (87%) diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index 9e5586e371de..e6caccc36623 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -11,3 +11,4 @@ Devices arm-vgic arm-vgic-v3 mpic + s390_flic diff --git a/Documentation/virt/kvm/devices/s390_flic.txt b/Documentation/virt/kvm/devices/s390_flic.rst similarity index 87% rename from Documentation/virt/kvm/devices/s390_flic.txt rename to Documentation/virt/kvm/devices/s390_flic.rst index a4e20a090174..954190da7d04 100644 --- a/Documentation/virt/kvm/devices/s390_flic.txt +++ b/Documentation/virt/kvm/devices/s390_flic.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +==================================== FLIC (floating interrupt controller) ==================================== @@ -31,8 +34,10 @@ Groups: Copies all floating interrupts into a buffer provided by userspace. When the buffer is too small it returns -ENOMEM, which is the indication for userspace to try again with a bigger buffer. + -ENOBUFS is returned when the allocation of a kernelspace buffer has failed. + -EFAULT is returned when copying data to userspace failed. All interrupts remain pending, i.e. are not deleted from the list of currently pending interrupts. @@ -60,38 +65,41 @@ Groups: KVM_DEV_FLIC_ADAPTER_REGISTER Register an I/O adapter interrupt source. Takes a kvm_s390_io_adapter - describing the adapter to register: + describing the adapter to register:: -struct kvm_s390_io_adapter { - __u32 id; - __u8 isc; - __u8 maskable; - __u8 swap; - __u8 flags; -}; + struct kvm_s390_io_adapter { + __u32 id; + __u8 isc; + __u8 maskable; + __u8 swap; + __u8 flags; + }; id contains the unique id for the adapter, isc the I/O interruption subclass to use, maskable whether this adapter may be masked (interrupts turned off), swap whether the indicators need to be byte swapped, and flags contains further characteristics of the adapter. + Currently defined values for 'flags' are: + - KVM_S390_ADAPTER_SUPPRESSIBLE: adapter is subject to AIS (adapter-interrupt-suppression) facility. This flag only has an effect if the AIS capability is enabled. + Unknown flag values are ignored. KVM_DEV_FLIC_ADAPTER_MODIFY Modifies attributes of an existing I/O adapter interrupt source. Takes - a kvm_s390_io_adapter_req specifying the adapter and the operation: + a kvm_s390_io_adapter_req specifying the adapter and the operation:: -struct kvm_s390_io_adapter_req { - __u32 id; - __u8 type; - __u8 mask; - __u16 pad0; - __u64 addr; -}; + struct kvm_s390_io_adapter_req { + __u32 id; + __u8 type; + __u8 mask; + __u16 pad0; + __u64 addr; + }; id specifies the adapter and type the operation. The supported operations are: @@ -103,8 +111,9 @@ struct kvm_s390_io_adapter_req { perform a gmap translation for the guest address provided in addr, pin a userspace page for the translated address and add it to the list of mappings - Note: A new mapping will be created unconditionally; therefore, - the calling code should avoid making duplicate mappings. + + .. note:: A new mapping will be created unconditionally; therefore, + the calling code should avoid making duplicate mappings. KVM_S390_IO_ADAPTER_UNMAP release a userspace page for the translated address specified in addr @@ -112,16 +121,17 @@ struct kvm_s390_io_adapter_req { KVM_DEV_FLIC_AISM modify the adapter-interruption-suppression mode for a given isc if the - AIS capability is enabled. Takes a kvm_s390_ais_req describing: + AIS capability is enabled. Takes a kvm_s390_ais_req describing:: -struct kvm_s390_ais_req { - __u8 isc; - __u16 mode; -}; + struct kvm_s390_ais_req { + __u8 isc; + __u16 mode; + }; isc contains the target I/O interruption subclass, mode the target adapter-interruption-suppression mode. The following modes are currently supported: + - KVM_S390_AIS_MODE_ALL: ALL-Interruptions Mode, i.e. airq injection is always allowed; - KVM_S390_AIS_MODE_SINGLE: SINGLE-Interruption Mode, i.e. airq @@ -139,12 +149,12 @@ struct kvm_s390_ais_req { KVM_DEV_FLIC_AISM_ALL Gets or sets the adapter-interruption-suppression mode for all ISCs. Takes - a kvm_s390_ais_all describing: + a kvm_s390_ais_all describing:: -struct kvm_s390_ais_all { - __u8 simm; /* Single-Interruption-Mode mask */ - __u8 nimm; /* No-Interruption-Mode mask * -}; + struct kvm_s390_ais_all { + __u8 simm; /* Single-Interruption-Mode mask */ + __u8 nimm; /* No-Interruption-Mode mask * + }; simm contains Single-Interruption-Mode mask for all ISCs, nimm contains No-Interruption-Mode mask for all ISCs. Each bit in simm and nimm corresponds @@ -159,5 +169,5 @@ ENXIO, as specified in the API documentation). It is not possible to conclude that a FLIC operation is unavailable based on the error code resulting from a usage attempt. -Note: The KVM_DEV_FLIC_CLEAR_IO_IRQ ioctl will return EINVAL in case a zero -schid is specified. +.. note:: The KVM_DEV_FLIC_CLEAR_IO_IRQ ioctl will return EINVAL in case a + zero schid is specified. From patchwork Mon Feb 10 06:02:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372539 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1E2B517F0 for ; Mon, 10 Feb 2020 06:03:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E767324685 for ; Mon, 10 Feb 2020 06:03:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314613; bh=N0OPd0iacFA/47RM0+QleZ2IobAGm95hjz/zZi9OeEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Bx2tdTHxgBhUEFEb+KJOvAxc2MZAB17IGaeenOx4V2LJQ9Pb6gcAJ6y9I8jLTZ5jY NFy1tsqS7qI8dv9mjxsLcJOhWUPb3tYcaQYYEkT6Z0/Jaxk4N5dqDY4puwrDYjY1Wv 9/iT8KneGKs8qu8Bgw7Yt9uCSzFTHozxzhEoNo8M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727022AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36318 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727505AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=TMlBkOqOYR3ysxOJY5Cjd1qwRLlnNrloXMHDgT46IzQ=; b=J0fcXwq5l1R5uWl8/SEMWZJJ8v nNl0eTaDibgD04bLAeJtc/Mc81ulP0DrINjWEbzorIZIXYNMnGhhqO7CHidTYHWMOI2gAdUzVJ4qD Qd/qB+zvAuPc2oXEmoIHZKopbhTSA0h2NAH2RbRqNVAe/zIfEddY0jjR6xcHNe0JooOka0VVwsYo/ l2y+eUA57tE5mdycIaQ2OaE7OwWMrEz5YHF/5KA7Mdg9UY9qV7G1aRkPqLgj/oww2mRYGTKKSa6Jy chXWhMLFb/dVdhOx5rzgZWR3z7aM+A5590MWPvT/uosYoa0IUj+jCHIVhyI5SrZI2O0YFth+NSLUw MQ89wmqQ==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tm-QF; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2VW-4K; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 12/28] docs: kvm: convert devices/vcpu.txt to ReST Date: Mon, 10 Feb 2020 07:02:50 +0100 Message-Id: <2096c62896f7cb2a8e636e1b68135f00c23a0672.1581314317.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use title markups; - adjust indentation and add blank lines as needed; - adjust tables to match ReST accepted formats; - use :field: markups; - mark code blocks as such. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/devices/index.rst | 1 + Documentation/virt/kvm/devices/vcpu.rst | 114 +++++++++++++++++++++++ Documentation/virt/kvm/devices/vcpu.txt | 76 --------------- 3 files changed, 115 insertions(+), 76 deletions(-) create mode 100644 Documentation/virt/kvm/devices/vcpu.rst delete mode 100644 Documentation/virt/kvm/devices/vcpu.txt diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index e6caccc36623..5a61838f0e61 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -12,3 +12,4 @@ Devices arm-vgic-v3 mpic s390_flic + vcpu diff --git a/Documentation/virt/kvm/devices/vcpu.rst b/Documentation/virt/kvm/devices/vcpu.rst new file mode 100644 index 000000000000..9963e680770a --- /dev/null +++ b/Documentation/virt/kvm/devices/vcpu.rst @@ -0,0 +1,114 @@ +.. SPDX-License-Identifier: GPL-2.0 + +====================== +Generic vcpu interface +====================== + +The virtual cpu "device" also accepts the ioctls KVM_SET_DEVICE_ATTR, +KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same struct +kvm_device_attr as other devices, but targets VCPU-wide settings and controls. + +The groups and attributes per virtual cpu, if any, are architecture specific. + +1. GROUP: KVM_ARM_VCPU_PMU_V3_CTRL +================================== + +:Architectures: ARM64 + +1.1. ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_IRQ +--------------------------------------- + +:Parameters: in kvm_device_attr.addr the address for PMU overflow interrupt is a + pointer to an int + +Returns: + + ======= ======================================================== + -EBUSY The PMU overflow interrupt is already set + -ENXIO The overflow interrupt not set when attempting to get it + -ENODEV PMUv3 not supported + -EINVAL Invalid PMU overflow interrupt number supplied or + trying to set the IRQ number without using an in-kernel + irqchip. + ======= ======================================================== + +A value describing the PMUv3 (Performance Monitor Unit v3) overflow interrupt +number for this vcpu. This interrupt could be a PPI or SPI, but the interrupt +type must be same for each vcpu. As a PPI, the interrupt number is the same for +all vcpus, while as an SPI it must be a separate number per vcpu. + +1.2 ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_INIT +--------------------------------------- + +:Parameters: no additional parameter in kvm_device_attr.addr + +Returns: + + ======= ====================================================== + -ENODEV PMUv3 not supported or GIC not initialized + -ENXIO PMUv3 not properly configured or in-kernel irqchip not + configured as required prior to calling this attribute + -EBUSY PMUv3 already initialized + ======= ====================================================== + +Request the initialization of the PMUv3. If using the PMUv3 with an in-kernel +virtual GIC implementation, this must be done after initializing the in-kernel +irqchip. + + +2. GROUP: KVM_ARM_VCPU_TIMER_CTRL +================================= + +:Architectures: ARM, ARM64 + +2.1. ATTRIBUTES: KVM_ARM_VCPU_TIMER_IRQ_VTIMER, KVM_ARM_VCPU_TIMER_IRQ_PTIMER +----------------------------------------------------------------------------- + +:Parameters: in kvm_device_attr.addr the address for the timer interrupt is a + pointer to an int + +Returns: + + ======= ================================= + -EINVAL Invalid timer interrupt number + -EBUSY One or more VCPUs has already run + ======= ================================= + +A value describing the architected timer interrupt number when connected to an +in-kernel virtual GIC. These must be a PPI (16 <= intid < 32). Setting the +attribute overrides the default values (see below). + +============================= ========================================== +KVM_ARM_VCPU_TIMER_IRQ_VTIMER The EL1 virtual timer intid (default: 27) +KVM_ARM_VCPU_TIMER_IRQ_PTIMER The EL1 physical timer intid (default: 30) +============================= ========================================== + +Setting the same PPI for different timers will prevent the VCPUs from running. +Setting the interrupt number on a VCPU configures all VCPUs created at that +time to use the number provided for a given timer, overwriting any previously +configured values on other VCPUs. Userspace should configure the interrupt +numbers on at least one VCPU after creating all VCPUs and before running any +VCPUs. + +3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL +================================== + +:Architectures: ARM64 + +3.1 ATTRIBUTE: KVM_ARM_VCPU_PVTIME_IPA +-------------------------------------- + +:Parameters: 64-bit base address + +Returns: + + ======= ====================================== + -ENXIO Stolen time not implemented + -EEXIST Base address already set for this VCPU + -EINVAL Base address not 64 byte aligned + ======= ====================================== + +Specifies the base address of the stolen time structure for this VCPU. The +base address must be 64 byte aligned and exist within a valid guest memory +region. See Documentation/virt/kvm/arm/pvtime.txt for more information +including the layout of the stolen time structure. diff --git a/Documentation/virt/kvm/devices/vcpu.txt b/Documentation/virt/kvm/devices/vcpu.txt deleted file mode 100644 index 6f3bd64a05b0..000000000000 --- a/Documentation/virt/kvm/devices/vcpu.txt +++ /dev/null @@ -1,76 +0,0 @@ -Generic vcpu interface -==================================== - -The virtual cpu "device" also accepts the ioctls KVM_SET_DEVICE_ATTR, -KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same struct -kvm_device_attr as other devices, but targets VCPU-wide settings and controls. - -The groups and attributes per virtual cpu, if any, are architecture specific. - -1. GROUP: KVM_ARM_VCPU_PMU_V3_CTRL -Architectures: ARM64 - -1.1. ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_IRQ -Parameters: in kvm_device_attr.addr the address for PMU overflow interrupt is a - pointer to an int -Returns: -EBUSY: The PMU overflow interrupt is already set - -ENXIO: The overflow interrupt not set when attempting to get it - -ENODEV: PMUv3 not supported - -EINVAL: Invalid PMU overflow interrupt number supplied or - trying to set the IRQ number without using an in-kernel - irqchip. - -A value describing the PMUv3 (Performance Monitor Unit v3) overflow interrupt -number for this vcpu. This interrupt could be a PPI or SPI, but the interrupt -type must be same for each vcpu. As a PPI, the interrupt number is the same for -all vcpus, while as an SPI it must be a separate number per vcpu. - -1.2 ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_INIT -Parameters: no additional parameter in kvm_device_attr.addr -Returns: -ENODEV: PMUv3 not supported or GIC not initialized - -ENXIO: PMUv3 not properly configured or in-kernel irqchip not - configured as required prior to calling this attribute - -EBUSY: PMUv3 already initialized - -Request the initialization of the PMUv3. If using the PMUv3 with an in-kernel -virtual GIC implementation, this must be done after initializing the in-kernel -irqchip. - - -2. GROUP: KVM_ARM_VCPU_TIMER_CTRL -Architectures: ARM,ARM64 - -2.1. ATTRIBUTE: KVM_ARM_VCPU_TIMER_IRQ_VTIMER -2.2. ATTRIBUTE: KVM_ARM_VCPU_TIMER_IRQ_PTIMER -Parameters: in kvm_device_attr.addr the address for the timer interrupt is a - pointer to an int -Returns: -EINVAL: Invalid timer interrupt number - -EBUSY: One or more VCPUs has already run - -A value describing the architected timer interrupt number when connected to an -in-kernel virtual GIC. These must be a PPI (16 <= intid < 32). Setting the -attribute overrides the default values (see below). - -KVM_ARM_VCPU_TIMER_IRQ_VTIMER: The EL1 virtual timer intid (default: 27) -KVM_ARM_VCPU_TIMER_IRQ_PTIMER: The EL1 physical timer intid (default: 30) - -Setting the same PPI for different timers will prevent the VCPUs from running. -Setting the interrupt number on a VCPU configures all VCPUs created at that -time to use the number provided for a given timer, overwriting any previously -configured values on other VCPUs. Userspace should configure the interrupt -numbers on at least one VCPU after creating all VCPUs and before running any -VCPUs. - -3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL -Architectures: ARM64 - -3.1 ATTRIBUTE: KVM_ARM_VCPU_PVTIME_IPA -Parameters: 64-bit base address -Returns: -ENXIO: Stolen time not implemented - -EEXIST: Base address already set for this VCPU - -EINVAL: Base address not 64 byte aligned - -Specifies the base address of the stolen time structure for this VCPU. The -base address must be 64 byte aligned and exist within a valid guest memory -region. See Documentation/virt/kvm/arm/pvtime.txt for more information -including the layout of the stolen time structure. From patchwork Mon Feb 10 06:02:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372587 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1AA3992A for ; Mon, 10 Feb 2020 06:04:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E7BD124650 for ; Mon, 10 Feb 2020 06:04:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314644; bh=ArAUkNUQ/vF/uez6+ESqcEZUEceHpZziK7NIyODV0XA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=i8dNwoQAorywRLOAXU2mAwbgu4YATE7RO3lnadeDky3K9sBxUJ7E2llZNqeehP+L4 mPi0+awletRnGQGDhSUE/G4jT/6T40fATNZrTC/+naz+cddKHYdJfQhG1+bUzmy8E1 FOQe9StjXLqmydyhjyI/dxc10ODfu/VqToMEzfL8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727767AbgBJGED (ORCPT ); Mon, 10 Feb 2020 01:04:03 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36310 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727496AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=8GfzltQhS3v+ZlAaDJGjOA5DZ8pCcqwOMokM0PKMq0I=; b=UV5Hfzhxx/q9CXwJ+S2gPVFR02 xGVsRspuI/Hs7JhCor9wCkWak8R55BUoiltwJ1+jX9DiIOVGiZEdCyHWQnpDk2v6Dkw0+wzykaalF nAVy5puQLGx7oI95Uuysare59M228Eu8OujSw27zXYa2ge9hDvj5qY86TpNcZEVZzASoMRLH/SAoO CBK7oJtUrbNDW94baXHod6TgkaqSGe3BUMFHo1PshH8lBLNS40A+iPs1h0vdLrwbs6NgqhIEnU2+d 1MnJuaUHE+XsHBfLJ78JhcdoSd43SXOJBCCO3Jlf8qDswHhG5e6na0f7DEB6SbkscAtlWQKfulaOO AAX0I/Kw==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tn-R8; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2Vb-63; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, Cornelia Huck Subject: [PATCH 13/28] docs: kvm: convert devices/vfio.txt to ReST Date: Mon, 10 Feb 2020 07:02:51 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use standard title markup; - adjust lists; - mark code blocks as such. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Cornelia Huck --- Documentation/virt/kvm/devices/index.rst | 1 + .../virt/kvm/devices/{vfio.txt => vfio.rst} | 25 +++++++++++-------- 2 files changed, 16 insertions(+), 10 deletions(-) rename Documentation/virt/kvm/devices/{vfio.txt => vfio.rst} (72%) diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index 5a61838f0e61..cbbadda080d0 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -13,3 +13,4 @@ Devices mpic s390_flic vcpu + vfio diff --git a/Documentation/virt/kvm/devices/vfio.txt b/Documentation/virt/kvm/devices/vfio.rst similarity index 72% rename from Documentation/virt/kvm/devices/vfio.txt rename to Documentation/virt/kvm/devices/vfio.rst index 528c77c8022c..2d20dc561069 100644 --- a/Documentation/virt/kvm/devices/vfio.txt +++ b/Documentation/virt/kvm/devices/vfio.rst @@ -1,8 +1,12 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================== VFIO virtual device =================== Device types supported: - KVM_DEV_TYPE_VFIO + + - KVM_DEV_TYPE_VFIO Only one VFIO instance may be created per VM. The created device tracks VFIO groups in use by the VM and features of those groups @@ -23,14 +27,15 @@ KVM_DEV_VFIO_GROUP attributes: for the VFIO group. KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: attaches a guest visible TCE table allocated by sPAPR KVM. - kvm_device_attr.addr points to a struct: + kvm_device_attr.addr points to a struct:: - struct kvm_vfio_spapr_tce { - __s32 groupfd; - __s32 tablefd; - }; + struct kvm_vfio_spapr_tce { + __s32 groupfd; + __s32 tablefd; + }; - where - @groupfd is a file descriptor for a VFIO group; - @tablefd is a file descriptor for a TCE table allocated via - KVM_CREATE_SPAPR_TCE. + where: + + - @groupfd is a file descriptor for a VFIO group; + - @tablefd is a file descriptor for a TCE table allocated via + KVM_CREATE_SPAPR_TCE. From patchwork Mon Feb 10 06:02:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372515 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AB34692A for ; Mon, 10 Feb 2020 06:03:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 75F3924689 for ; Mon, 10 Feb 2020 06:03:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314601; bh=9aWoD+P+VfN/7L0h6Q1firD8pf9dzEr2YDh3+L69jG4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=q69opohgUsoCkVrtOeIIBJd0VKIaigvRg3KfKm8xjfkuyrVn5LamfRa95lvYHnmuy oxeVyYGbYJZaPDfGVuC1wkjjJLAVeeVdATh13cP2KhrpMiYzr4NeCMcYLWTHLjyONh RJ8DaSTxgONIPG4E1XX2IZodXY12H8M5VmjGFDu4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727589AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36340 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727522AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=uloZ2hRCTHeMwe45hHHqi2VZ7Var6SW6HyweZws6Exc=; b=r0txvt12e0WuRI0naCcCJx5uu8 ps7PJk5Vxkitx9cZufCQN7EcMwblkpepd/D6DFZVoYUF8EM4pkmpsLVcrvo9eVGCQNWygSF5np1tc kmZoqvPEPAP3FeZ7KCdd63nLhba7ykj/DSSwGNAbaqAb0R5fAaq666cB6qyKjbCFQ57HI4u5nI8XF sZ2dkwgDWq2AqIbYEoQ8oCvV0N3Il+tZxUHJ+unPwotzR5Ut4p7/cTGYAleBmjYyNjHNrD1zGe0WN DMZIaFw0YPy2yY1dSM4ClkWGITW07GfcocvrFQRch4k7WnAZuPFn9JjA9krOLWBbJoZFptL0gh75s mAxrxGew==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006To-TL; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2Vg-7N; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, Cornelia Huck Subject: [PATCH 14/28] docs: kvm: convert devices/vm.txt to ReST Date: Mon, 10 Feb 2020 07:02:52 +0100 Message-Id: <071b0acc8641a033bb15313fa096a3f73f5dcf64.1581314317.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use title markups; - adjust indentation and add blank lines as needed; - use :field: markups; - Use cross-references; - mark code blocks as such. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Cornelia Huck --- Documentation/virt/kvm/devices/index.rst | 1 + .../virt/kvm/devices/{vm.txt => vm.rst} | 206 +++++++++++------- 2 files changed, 127 insertions(+), 80 deletions(-) rename Documentation/virt/kvm/devices/{vm.txt => vm.rst} (61%) diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index cbbadda080d0..29f8ecdf7fa0 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -14,3 +14,4 @@ Devices s390_flic vcpu vfio + vm diff --git a/Documentation/virt/kvm/devices/vm.txt b/Documentation/virt/kvm/devices/vm.rst similarity index 61% rename from Documentation/virt/kvm/devices/vm.txt rename to Documentation/virt/kvm/devices/vm.rst index 4ffb82b02468..0aa5b1cfd700 100644 --- a/Documentation/virt/kvm/devices/vm.txt +++ b/Documentation/virt/kvm/devices/vm.rst @@ -1,5 +1,8 @@ +.. SPDX-License-Identifier: GPL-2.0 + +==================== Generic vm interface -==================================== +==================== The virtual machine "device" also accepts the ioctls KVM_SET_DEVICE_ATTR, KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same @@ -10,30 +13,38 @@ The groups and attributes per virtual machine, if any, are architecture specific. 1. GROUP: KVM_S390_VM_MEM_CTRL -Architectures: s390 +============================== + +:Architectures: s390 1.1. ATTRIBUTE: KVM_S390_VM_MEM_ENABLE_CMMA -Parameters: none -Returns: -EBUSY if a vcpu is already defined, otherwise 0 +------------------------------------------- + +:Parameters: none +:Returns: -EBUSY if a vcpu is already defined, otherwise 0 Enables Collaborative Memory Management Assist (CMMA) for the virtual machine. 1.2. ATTRIBUTE: KVM_S390_VM_MEM_CLR_CMMA -Parameters: none -Returns: -EINVAL if CMMA was not enabled - 0 otherwise +---------------------------------------- + +:Parameters: none +:Returns: -EINVAL if CMMA was not enabled; + 0 otherwise Clear the CMMA status for all guest pages, so any pages the guest marked as unused are again used any may not be reclaimed by the host. 1.3. ATTRIBUTE KVM_S390_VM_MEM_LIMIT_SIZE -Parameters: in attr->addr the address for the new limit of guest memory -Returns: -EFAULT if the given address is not accessible - -EINVAL if the virtual machine is of type UCONTROL - -E2BIG if the given guest memory is to big for that machine - -EBUSY if a vcpu is already defined - -ENOMEM if not enough memory is available for a new shadow guest mapping - 0 otherwise +----------------------------------------- + +:Parameters: in attr->addr the address for the new limit of guest memory +:Returns: -EFAULT if the given address is not accessible; + -EINVAL if the virtual machine is of type UCONTROL; + -E2BIG if the given guest memory is to big for that machine; + -EBUSY if a vcpu is already defined; + -ENOMEM if not enough memory is available for a new shadow guest mapping; + 0 otherwise. Allows userspace to query the actual limit and set a new limit for the maximum guest memory size. The limit will be rounded up to @@ -42,78 +53,92 @@ the number of page table levels. In the case that there is no limit we will set the limit to KVM_S390_NO_MEM_LIMIT (U64_MAX). 2. GROUP: KVM_S390_VM_CPU_MODEL -Architectures: s390 +=============================== + +:Architectures: s390 2.1. ATTRIBUTE: KVM_S390_VM_CPU_MACHINE (r/o) +--------------------------------------------- -Allows user space to retrieve machine and kvm specific cpu related information: +Allows user space to retrieve machine and kvm specific cpu related information:: -struct kvm_s390_vm_cpu_machine { + struct kvm_s390_vm_cpu_machine { __u64 cpuid; # CPUID of host __u32 ibc; # IBC level range offered by host __u8 pad[4]; __u64 fac_mask[256]; # set of cpu facilities enabled by KVM __u64 fac_list[256]; # set of cpu facilities offered by host -} + } -Parameters: address of buffer to store the machine related cpu data - of type struct kvm_s390_vm_cpu_machine* -Returns: -EFAULT if the given address is not accessible from kernel space - -ENOMEM if not enough memory is available to process the ioctl - 0 in case of success +:Parameters: address of buffer to store the machine related cpu data + of type struct kvm_s390_vm_cpu_machine* +:Returns: -EFAULT if the given address is not accessible from kernel space; + -ENOMEM if not enough memory is available to process the ioctl; + 0 in case of success. 2.2. ATTRIBUTE: KVM_S390_VM_CPU_PROCESSOR (r/w) +=============================================== -Allows user space to retrieve or request to change cpu related information for a vcpu: +Allows user space to retrieve or request to change cpu related information for a vcpu:: -struct kvm_s390_vm_cpu_processor { + struct kvm_s390_vm_cpu_processor { __u64 cpuid; # CPUID currently (to be) used by this vcpu __u16 ibc; # IBC level currently (to be) used by this vcpu __u8 pad[6]; __u64 fac_list[256]; # set of cpu facilities currently (to be) used - # by this vcpu -} + # by this vcpu + } KVM does not enforce or limit the cpu model data in any form. Take the information retrieved by means of KVM_S390_VM_CPU_MACHINE as hint for reasonable configuration setups. Instruction interceptions triggered by additionally set facility bits that are not handled by KVM need to by imlemented in the VM driver code. -Parameters: address of buffer to store/set the processor related cpu - data of type struct kvm_s390_vm_cpu_processor*. -Returns: -EBUSY in case 1 or more vcpus are already activated (only in write case) - -EFAULT if the given address is not accessible from kernel space - -ENOMEM if not enough memory is available to process the ioctl - 0 in case of success +:Parameters: address of buffer to store/set the processor related cpu + data of type struct kvm_s390_vm_cpu_processor*. +:Returns: -EBUSY in case 1 or more vcpus are already activated (only in write case); + -EFAULT if the given address is not accessible from kernel space; + -ENOMEM if not enough memory is available to process the ioctl; + 0 in case of success. + +.. _KVM_S390_VM_CPU_MACHINE_FEAT: 2.3. ATTRIBUTE: KVM_S390_VM_CPU_MACHINE_FEAT (r/o) +-------------------------------------------------- Allows user space to retrieve available cpu features. A feature is available if provided by the hardware and supported by kvm. In theory, cpu features could even be completely emulated by kvm. -struct kvm_s390_vm_cpu_feat { - __u64 feat[16]; # Bitmap (1 = feature available), MSB 0 bit numbering -}; +:: -Parameters: address of a buffer to load the feature list from. -Returns: -EFAULT if the given address is not accessible from kernel space. - 0 in case of success. + struct kvm_s390_vm_cpu_feat { + __u64 feat[16]; # Bitmap (1 = feature available), MSB 0 bit numbering + }; + +:Parameters: address of a buffer to load the feature list from. +:Returns: -EFAULT if the given address is not accessible from kernel space; + 0 in case of success. 2.4. ATTRIBUTE: KVM_S390_VM_CPU_PROCESSOR_FEAT (r/w) +---------------------------------------------------- Allows user space to retrieve or change enabled cpu features for all VCPUs of a VM. Features that are not available cannot be enabled. -See 2.3. for a description of the parameter struct. +See :ref:`KVM_S390_VM_CPU_MACHINE_FEAT` for +a description of the parameter struct. -Parameters: address of a buffer to store/load the feature list from. -Returns: -EFAULT if the given address is not accessible from kernel space. - -EINVAL if a cpu feature that is not available is to be enabled. - -EBUSY if at least one VCPU has already been defined. +:Parameters: address of a buffer to store/load the feature list from. +:Returns: -EFAULT if the given address is not accessible from kernel space; + -EINVAL if a cpu feature that is not available is to be enabled; + -EBUSY if at least one VCPU has already been defined; 0 in case of success. +.. _KVM_S390_VM_CPU_MACHINE_SUBFUNC: + 2.5. ATTRIBUTE: KVM_S390_VM_CPU_MACHINE_SUBFUNC (r/o) +----------------------------------------------------- Allows user space to retrieve available cpu subfunctions without any filtering done by a set IBC. These subfunctions are indicated to the guest VCPU via @@ -126,7 +151,9 @@ contained in the returned struct. If the affected instruction indicates subfunctions via a "test bit" mechanism, the subfunction codes are contained in the returned struct in MSB 0 bit numbering. -struct kvm_s390_vm_cpu_subfunc { +:: + + struct kvm_s390_vm_cpu_subfunc { u8 plo[32]; # always valid (ESA/390 feature) u8 ptff[16]; # valid with TOD-clock steering u8 kmac[16]; # valid with Message-Security-Assist @@ -143,13 +170,14 @@ struct kvm_s390_vm_cpu_subfunc { u8 kma[16]; # valid with Message-Security-Assist-Extension 8 u8 kdsa[16]; # valid with Message-Security-Assist-Extension 9 u8 reserved[1792]; # reserved for future instructions -}; + }; -Parameters: address of a buffer to load the subfunction blocks from. -Returns: -EFAULT if the given address is not accessible from kernel space. +:Parameters: address of a buffer to load the subfunction blocks from. +:Returns: -EFAULT if the given address is not accessible from kernel space; 0 in case of success. 2.6. ATTRIBUTE: KVM_S390_VM_CPU_PROCESSOR_SUBFUNC (r/w) +------------------------------------------------------- Allows user space to retrieve or change cpu subfunctions to be indicated for all VCPUs of a VM. This attribute will only be available if kernel and @@ -164,107 +192,125 @@ As long as no data has been written, a read will fail. The IBC will be used to determine available subfunctions in this case, this will guarantee backward compatibility. -See 2.5. for a description of the parameter struct. +See :ref:`KVM_S390_VM_CPU_MACHINE_SUBFUNC` for a +description of the parameter struct. -Parameters: address of a buffer to store/load the subfunction blocks from. -Returns: -EFAULT if the given address is not accessible from kernel space. - -EINVAL when reading, if there was no write yet. - -EBUSY if at least one VCPU has already been defined. +:Parameters: address of a buffer to store/load the subfunction blocks from. +:Returns: -EFAULT if the given address is not accessible from kernel space; + -EINVAL when reading, if there was no write yet; + -EBUSY if at least one VCPU has already been defined; 0 in case of success. 3. GROUP: KVM_S390_VM_TOD -Architectures: s390 +========================= + +:Architectures: s390 3.1. ATTRIBUTE: KVM_S390_VM_TOD_HIGH +------------------------------------ Allows user space to set/get the TOD clock extension (u8) (superseded by KVM_S390_VM_TOD_EXT). -Parameters: address of a buffer in user space to store the data (u8) to -Returns: -EFAULT if the given address is not accessible from kernel space +:Parameters: address of a buffer in user space to store the data (u8) to +:Returns: -EFAULT if the given address is not accessible from kernel space; -EINVAL if setting the TOD clock extension to != 0 is not supported 3.2. ATTRIBUTE: KVM_S390_VM_TOD_LOW +----------------------------------- Allows user space to set/get bits 0-63 of the TOD clock register as defined in the POP (u64). -Parameters: address of a buffer in user space to store the data (u64) to -Returns: -EFAULT if the given address is not accessible from kernel space +:Parameters: address of a buffer in user space to store the data (u64) to +:Returns: -EFAULT if the given address is not accessible from kernel space 3.3. ATTRIBUTE: KVM_S390_VM_TOD_EXT +----------------------------------- + Allows user space to set/get bits 0-63 of the TOD clock register as defined in the POP (u64). If the guest CPU model supports the TOD clock extension (u8), it also allows user space to get/set it. If the guest CPU model does not support it, it is stored as 0 and not allowed to be set to a value != 0. -Parameters: address of a buffer in user space to store the data - (kvm_s390_vm_tod_clock) to -Returns: -EFAULT if the given address is not accessible from kernel space +:Parameters: address of a buffer in user space to store the data + (kvm_s390_vm_tod_clock) to +:Returns: -EFAULT if the given address is not accessible from kernel space; -EINVAL if setting the TOD clock extension to != 0 is not supported 4. GROUP: KVM_S390_VM_CRYPTO -Architectures: s390 +============================ + +:Architectures: s390 4.1. ATTRIBUTE: KVM_S390_VM_CRYPTO_ENABLE_AES_KW (w/o) +------------------------------------------------------ Allows user space to enable aes key wrapping, including generating a new wrapping key. -Parameters: none -Returns: 0 +:Parameters: none +:Returns: 0 4.2. ATTRIBUTE: KVM_S390_VM_CRYPTO_ENABLE_DEA_KW (w/o) +------------------------------------------------------ Allows user space to enable dea key wrapping, including generating a new wrapping key. -Parameters: none -Returns: 0 +:Parameters: none +:Returns: 0 4.3. ATTRIBUTE: KVM_S390_VM_CRYPTO_DISABLE_AES_KW (w/o) +------------------------------------------------------- Allows user space to disable aes key wrapping, clearing the wrapping key. -Parameters: none -Returns: 0 +:Parameters: none +:Returns: 0 4.4. ATTRIBUTE: KVM_S390_VM_CRYPTO_DISABLE_DEA_KW (w/o) +------------------------------------------------------- Allows user space to disable dea key wrapping, clearing the wrapping key. -Parameters: none -Returns: 0 +:Parameters: none +:Returns: 0 5. GROUP: KVM_S390_VM_MIGRATION -Architectures: s390 +=============================== + +:Architectures: s390 5.1. ATTRIBUTE: KVM_S390_VM_MIGRATION_STOP (w/o) +------------------------------------------------ Allows userspace to stop migration mode, needed for PGSTE migration. Setting this attribute when migration mode is not active will have no effects. -Parameters: none -Returns: 0 +:Parameters: none +:Returns: 0 5.2. ATTRIBUTE: KVM_S390_VM_MIGRATION_START (w/o) +------------------------------------------------- Allows userspace to start migration mode, needed for PGSTE migration. Setting this attribute when migration mode is already active will have no effects. -Parameters: none -Returns: -ENOMEM if there is not enough free memory to start migration mode - -EINVAL if the state of the VM is invalid (e.g. no memory defined) +:Parameters: none +:Returns: -ENOMEM if there is not enough free memory to start migration mode; + -EINVAL if the state of the VM is invalid (e.g. no memory defined); 0 in case of success. 5.3. ATTRIBUTE: KVM_S390_VM_MIGRATION_STATUS (r/o) +-------------------------------------------------- Allows userspace to query the status of migration mode. -Parameters: address of a buffer in user space to store the data (u64) to; - the data itself is either 0 if migration mode is disabled or 1 - if it is enabled -Returns: -EFAULT if the given address is not accessible from kernel space +:Parameters: address of a buffer in user space to store the data (u64) to; + the data itself is either 0 if migration mode is disabled or 1 + if it is enabled +:Returns: -EFAULT if the given address is not accessible from kernel space; 0 in case of success. From patchwork Mon Feb 10 06:02:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372559 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1156292A for ; Mon, 10 Feb 2020 06:03:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E461C24655 for ; Mon, 10 Feb 2020 06:03:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314628; bh=mylKyYOCMH2opzKvVcnNxCLFGkOsR2hMN6SRW8Il3a4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=TzARfidkFR8r2VVAD7wq4BRcdRsAZhpHZyvO+ffbC+XLM6cfu6qaHEPK/DCGmxH3p vvPXTh6urnL+igCTLdBxHJs6ZGRm8In9nksXPTMXEiamr0LGR0MDu3lAdggVvqeHHg aEPj8+7l+J2M1pPfHbNbbFrp6VK5nAXwoXWPlwxY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727782AbgBJGDr (ORCPT ); Mon, 10 Feb 2020 01:03:47 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36302 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727481AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=W2TEM9K5krwWHu3V6Pmpbxn8qb5V0LOnOybj7d04Q5s=; b=Ef/2ashQ1HkLybV2TXUuG+xln/ ZRHYNevYqV/lW3eLq7MgiuoUoZhBSyd3tD5sTiGbHZh4h06Uv6knSTdUAkk12f5QZ4767vBbqNpSt Pkx7jTwcgWM8VuekehhxOYP9z6JwAAkkQ+9noqlDC5WMARNEhnI6cwmnr1A3OFKcfpNYouqDfV+00 h4ZN/Y3qHw1cK1NawlPHvT43RVV0w1uy5N+yPGIYzps9GFsd5Mtfj+sMCJmajZpUIc87+wRUW/qti jCe8b0O9OnbHAmSIoV0Ts1QWQkL5BriWjdjOLaBAKvIUjmOVoB3MZFeVLdfaH5iFYYimz3hqz0xMV hUKWIv6w==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tp-TR; Mon, 10 Feb 2020 06:03:11 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2Vl-8E; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 15/28] docs: kvm: convert devices/xics.txt to ReST Date: Mon, 10 Feb 2020 07:02:53 +0100 Message-Id: <3877e3c13e91f355b1e3337c76e735c8a24d4e40.1581314317.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use title markups; - adjust indentation and add blank lines as needed; - adjust tables to match ReST accepted formats; - use :field: markups. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/devices/index.rst | 1 + .../virt/kvm/devices/{xics.txt => xics.rst} | 28 +++++++++++++++---- 2 files changed, 23 insertions(+), 6 deletions(-) rename Documentation/virt/kvm/devices/{xics.txt => xics.rst} (84%) diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index 29f8ecdf7fa0..63b61369d09b 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -15,3 +15,4 @@ Devices vcpu vfio vm + xics diff --git a/Documentation/virt/kvm/devices/xics.txt b/Documentation/virt/kvm/devices/xics.rst similarity index 84% rename from Documentation/virt/kvm/devices/xics.txt rename to Documentation/virt/kvm/devices/xics.rst index 423332dda7bc..2d6927e0b776 100644 --- a/Documentation/virt/kvm/devices/xics.txt +++ b/Documentation/virt/kvm/devices/xics.rst @@ -1,20 +1,31 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================= XICS interrupt controller +========================= Device type supported: KVM_DEV_TYPE_XICS Groups: 1. KVM_DEV_XICS_GRP_SOURCES - Attributes: One per interrupt source, indexed by the source number. + Attributes: + One per interrupt source, indexed by the source number. 2. KVM_DEV_XICS_GRP_CTRL - Attributes: - 2.1 KVM_DEV_XICS_NR_SERVERS (write only) + Attributes: + + 2.1 KVM_DEV_XICS_NR_SERVERS (write only) + The kvm_device_attr.addr points to a __u32 value which is the number of interrupt server numbers (ie, highest possible vcpu id plus one). + Errors: - -EINVAL: Value greater than KVM_MAX_VCPU_ID. - -EFAULT: Invalid user pointer for attr->addr. - -EBUSY: A vcpu is already connected to the device. + + ======= ========================================== + -EINVAL Value greater than KVM_MAX_VCPU_ID. + -EFAULT Invalid user pointer for attr->addr. + -EBUSY A vcpu is already connected to the device. + ======= ========================================== This device emulates the XICS (eXternal Interrupt Controller Specification) defined in PAPR. The XICS has a set of interrupt @@ -53,24 +64,29 @@ the interrupt source number. The 64 bit state word has the following bitfields, starting from the least-significant end of the word: * Destination (server number), 32 bits + This specifies where the interrupt should be sent, and is the interrupt server number specified for the destination vcpu. * Priority, 8 bits + This is the priority specified for this interrupt source, where 0 is the highest priority and 255 is the lowest. An interrupt with a priority of 255 will never be delivered. * Level sensitive flag, 1 bit + This bit is 1 for a level-sensitive interrupt source, or 0 for edge-sensitive (or MSI). * Masked flag, 1 bit + This bit is set to 1 if the interrupt is masked (cannot be delivered regardless of its priority), for example by the ibm,int-off RTAS call, or 0 if it is not masked. * Pending flag, 1 bit + This bit is 1 if the source has a pending interrupt, otherwise 0. Only one XICS instance may be created per VM. From patchwork Mon Feb 10 06:02:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372517 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4056D17F0 for ; Mon, 10 Feb 2020 06:03:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 139952468A for ; Mon, 10 Feb 2020 06:03:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314602; bh=YK8FIkaO5ux/wXmCrRJ/AwyWFSwlbi8SGFxZRNZnDD0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eYxgKmdhxm774plyN6KctA5YoHhUpoj5geWNvoGu4P2FpWdwqAbs83mRNmxf9yQfW zJvw+2WUqIbksN+n2aXkLXWuLY1bO9smcxiCzMgPkUdeu31axBm34BK/pSbdpiYlSf tNCz35B2E1h/T1mL6WzAAcPR2paE4j0lI1LdpWwg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727570AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36336 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727509AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=ncsM0xzARTSEa19oQa9XkTFMrAwUc3uVKUGgEy0y3l8=; b=YFUI6BTjJzMW979Q5ooq+9uCPE YFyUFJ4bRumzkkLisDJRtvDv9+gN82LW1aQ4Ik6ZEfvUEhSuGhpQBCmigBfSjzxFCrYfpz/eoM+26 mmeOO/281qX8V0VtUYahWKrNs9fNsXb3WMP9PEcrv20SO41EbUAT6FIQRI/lWycPN1R3KUU3kFRYd YoKwiHBiIgEqn5w8ezTrdlDW3+CDEs/yc4Crlrkr44G/QwP80m12Jw5JsjjWkk+7ifzlWHuItzTEw KT4r36X5Mpys+8ROUJGcAD3mZJcVifCE3aq5z0WW8CA+C6iFoetoVSnZrzzxZW8we+uE931M+bU3q e5Zc5W3w==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A3-0006Tq-VY; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2Vq-9C; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 16/28] docs: kvm: convert devices/xive.txt to ReST Date: Mon, 10 Feb 2020 07:02:54 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use title markups; - adjust indentation and add blank lines as needed; - adjust tables to match ReST accepted formats; - mark code blocks as such. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/devices/index.rst | 1 + .../virt/kvm/devices/{xive.txt => xive.rst} | 148 +++++++++++------- 2 files changed, 96 insertions(+), 53 deletions(-) rename Documentation/virt/kvm/devices/{xive.txt => xive.rst} (62%) diff --git a/Documentation/virt/kvm/devices/index.rst b/Documentation/virt/kvm/devices/index.rst index 63b61369d09b..192cda7405c8 100644 --- a/Documentation/virt/kvm/devices/index.rst +++ b/Documentation/virt/kvm/devices/index.rst @@ -16,3 +16,4 @@ Devices vfio vm xics + xive diff --git a/Documentation/virt/kvm/devices/xive.txt b/Documentation/virt/kvm/devices/xive.rst similarity index 62% rename from Documentation/virt/kvm/devices/xive.txt rename to Documentation/virt/kvm/devices/xive.rst index f5d1d6b5af61..8bdf3dc38f01 100644 --- a/Documentation/virt/kvm/devices/xive.txt +++ b/Documentation/virt/kvm/devices/xive.rst @@ -1,8 +1,11 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=========================================================== POWER9 eXternal Interrupt Virtualization Engine (XIVE Gen1) -========================================================== +=========================================================== Device types supported: - KVM_DEV_TYPE_XIVE POWER9 XIVE Interrupt Controller generation 1 + - KVM_DEV_TYPE_XIVE POWER9 XIVE Interrupt Controller generation 1 This device acts as a VM interrupt controller. It provides the KVM interface to configure the interrupt sources of a VM in the underlying @@ -64,72 +67,100 @@ the legacy interrupt mode, referred as XICS (POWER7/8). * Groups: - 1. KVM_DEV_XIVE_GRP_CTRL - Provides global controls on the device +1. KVM_DEV_XIVE_GRP_CTRL + Provides global controls on the device + Attributes: 1.1 KVM_DEV_XIVE_RESET (write only) Resets the interrupt controller configuration for sources and event queues. To be used by kexec and kdump. + Errors: none 1.2 KVM_DEV_XIVE_EQ_SYNC (write only) Sync all the sources and queues and mark the EQ pages dirty. This to make sure that a consistent memory state is captured when migrating the VM. + Errors: none 1.3 KVM_DEV_XIVE_NR_SERVERS (write only) The kvm_device_attr.addr points to a __u32 value which is the number of interrupt server numbers (ie, highest possible vcpu id plus one). + Errors: - -EINVAL: Value greater than KVM_MAX_VCPU_ID. - -EFAULT: Invalid user pointer for attr->addr. - -EBUSY: A vCPU is already connected to the device. - 2. KVM_DEV_XIVE_GRP_SOURCE (write only) - Initializes a new source in the XIVE device and mask it. + ======= ========================================== + -EINVAL Value greater than KVM_MAX_VCPU_ID. + -EFAULT Invalid user pointer for attr->addr. + -EBUSY A vCPU is already connected to the device. + ======= ========================================== + +2. KVM_DEV_XIVE_GRP_SOURCE (write only) + Initializes a new source in the XIVE device and mask it. + Attributes: Interrupt source number (64-bit) - The kvm_device_attr.addr points to a __u64 value: - bits: | 63 .... 2 | 1 | 0 - values: | unused | level | type + + The kvm_device_attr.addr points to a __u64 value:: + + bits: | 63 .... 2 | 1 | 0 + values: | unused | level | type + - type: 0:MSI 1:LSI - level: assertion level in case of an LSI. + Errors: - -E2BIG: Interrupt source number is out of range - -ENOMEM: Could not create a new source block - -EFAULT: Invalid user pointer for attr->addr. - -ENXIO: Could not allocate underlying HW interrupt - 3. KVM_DEV_XIVE_GRP_SOURCE_CONFIG (write only) - Configures source targeting + ======= ========================================== + -E2BIG Interrupt source number is out of range + -ENOMEM Could not create a new source block + -EFAULT Invalid user pointer for attr->addr. + -ENXIO Could not allocate underlying HW interrupt + ======= ========================================== + +3. KVM_DEV_XIVE_GRP_SOURCE_CONFIG (write only) + Configures source targeting + Attributes: Interrupt source number (64-bit) - The kvm_device_attr.addr points to a __u64 value: - bits: | 63 .... 33 | 32 | 31 .. 3 | 2 .. 0 - values: | eisn | mask | server | priority + + The kvm_device_attr.addr points to a __u64 value:: + + bits: | 63 .... 33 | 32 | 31 .. 3 | 2 .. 0 + values: | eisn | mask | server | priority + - priority: 0-7 interrupt priority level - server: CPU number chosen to handle the interrupt - mask: mask flag (unused) - eisn: Effective Interrupt Source Number + Errors: - -ENOENT: Unknown source number - -EINVAL: Not initialized source number - -EINVAL: Invalid priority - -EINVAL: Invalid CPU number. - -EFAULT: Invalid user pointer for attr->addr. - -ENXIO: CPU event queues not configured or configuration of the - underlying HW interrupt failed - -EBUSY: No CPU available to serve interrupt - 4. KVM_DEV_XIVE_GRP_EQ_CONFIG (read-write) - Configures an event queue of a CPU + ======= ======================================================= + -ENOENT Unknown source number + -EINVAL Not initialized source number + -EINVAL Invalid priority + -EINVAL Invalid CPU number. + -EFAULT Invalid user pointer for attr->addr. + -ENXIO CPU event queues not configured or configuration of the + underlying HW interrupt failed + -EBUSY No CPU available to serve interrupt + ======= ======================================================= + +4. KVM_DEV_XIVE_GRP_EQ_CONFIG (read-write) + Configures an event queue of a CPU + Attributes: EQ descriptor identifier (64-bit) - The EQ descriptor identifier is a tuple (server, priority) : - bits: | 63 .... 32 | 31 .. 3 | 2 .. 0 - values: | unused | server | priority - The kvm_device_attr.addr points to : + + The EQ descriptor identifier is a tuple (server, priority):: + + bits: | 63 .... 32 | 31 .. 3 | 2 .. 0 + values: | unused | server | priority + + The kvm_device_attr.addr points to:: + struct kvm_ppc_xive_eq { __u32 flags; __u32 qshift; @@ -138,8 +169,9 @@ the legacy interrupt mode, referred as XICS (POWER7/8). __u32 qindex; __u8 pad[40]; }; + - flags: queue flags - KVM_XIVE_EQ_ALWAYS_NOTIFY (required) + KVM_XIVE_EQ_ALWAYS_NOTIFY (required) forces notification without using the coalescing mechanism provided by the XIVE END ESBs. - qshift: queue size (power of 2) @@ -147,22 +179,31 @@ the legacy interrupt mode, referred as XICS (POWER7/8). - qtoggle: current queue toggle bit - qindex: current queue index - pad: reserved for future use + Errors: - -ENOENT: Invalid CPU number - -EINVAL: Invalid priority - -EINVAL: Invalid flags - -EINVAL: Invalid queue size - -EINVAL: Invalid queue address - -EFAULT: Invalid user pointer for attr->addr. - -EIO: Configuration of the underlying HW failed - 5. KVM_DEV_XIVE_GRP_SOURCE_SYNC (write only) - Synchronize the source to flush event notifications + ======= ========================================= + -ENOENT Invalid CPU number + -EINVAL Invalid priority + -EINVAL Invalid flags + -EINVAL Invalid queue size + -EINVAL Invalid queue address + -EFAULT Invalid user pointer for attr->addr. + -EIO Configuration of the underlying HW failed + ======= ========================================= + +5. KVM_DEV_XIVE_GRP_SOURCE_SYNC (write only) + Synchronize the source to flush event notifications + Attributes: Interrupt source number (64-bit) + Errors: - -ENOENT: Unknown source number - -EINVAL: Not initialized source number + + ======= ============================= + -ENOENT Unknown source number + -EINVAL Not initialized source number + ======= ============================= * VCPU state @@ -175,11 +216,12 @@ the legacy interrupt mode, referred as XICS (POWER7/8). as it synthesizes the priorities of the pending interrupts. We capture a bit more to report debug information. - KVM_REG_PPC_VP_STATE (2 * 64bits) - bits: | 63 .... 32 | 31 .... 0 | - values: | TIMA word0 | TIMA word1 | - bits: | 127 .......... 64 | - values: | unused | + KVM_REG_PPC_VP_STATE (2 * 64bits):: + + bits: | 63 .... 32 | 31 .... 0 | + values: | TIMA word0 | TIMA word1 | + bits: | 127 .......... 64 | + values: | unused | * Migration: @@ -196,7 +238,7 @@ the legacy interrupt mode, referred as XICS (POWER7/8). 3. Capture the state of the source targeting, the EQs configuration and the state of thread interrupt context registers. - Restore is similar : + Restore is similar: 1. Restore the EQ configuration. As targeting depends on it. 2. Restore targeting From patchwork Mon Feb 10 06:02:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372505 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BCFB4186E for ; Mon, 10 Feb 2020 06:03:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D74A24680 for ; Mon, 10 Feb 2020 06:03:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314596; bh=ACLKgtOjs1/kx+wbT4Rn8GJGq8QJtLCdDglgOk3kj+I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eLz10Xb/NwoypfytPkxj3ldTIln1Wjf02IlhfkE/rd6rXrpe1MaTsyoISv/mJcaA/ TlZ8RTPASIr9GiaMrKmtrQqc4meimr99Bq7zVbkTbktJ63TQEMCnXykst9Ht0ETzc9 JU7A+qEVew0nmsMrKeiHcLh7j865Lba8ew95VkA4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727618AbgBJGDP (ORCPT ); Mon, 10 Feb 2020 01:03:15 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36518 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727599AbgBJGDP (ORCPT ); Mon, 10 Feb 2020 01:03:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description; bh=3UnzF7zjF64RwcwS2b9xfPl03ZdlzYowUq2l+Ymomh8=; b=o+t3A7i7rLu0EmVxLaqWdgJISk VHTBsNtiJgkmGwX6vd4lByt2Aw2Go1wPCi/mMGZ71kSkG8z+KSlM6lW86+yDxG6cD0zWTqTsZC2J+ IvdY9x04mlWaUz8TmXOC/NTD7gyixP19SiIk5MvyUlbNxqTKLHpuiJ8p2Nt3bghTA1ztgNEoJahWS ejtvmLHDA2fF+yFLK7cIB/JsGSnlsJpgtP0cHgFdZHIrCqztsEktvogiBUvvMII41oRyPqVk9PCV1 FwlPNULrJsE0JzRQGVF5U/pnHtNPGOeHh4wx5fvOOCqA/JUBKc1rzSD4P1saTc8dImEuhrkOpcw1z xuYhLp+g==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Tr-1N; Mon, 10 Feb 2020 06:03:14 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2Vx-Bh; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 17/28] docs: kvm: Convert api.txt to ReST format Date: Mon, 10 Feb 2020 07:02:55 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org convert api.txt document to ReST format while trying to keep its format as close as possible with the authors intent, and avoid adding uneeded markups. - Use document title and chapter markups; - Convert tables; - Add markups for literal blocks; - use :field: for field descriptions; - Add blank lines and adjust indentation Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/{api.txt => api.rst} | 3348 +++++++++++-------- Documentation/virt/kvm/index.rst | 1 + 2 files changed, 1963 insertions(+), 1386 deletions(-) rename Documentation/virt/kvm/{api.txt => api.rst} (71%) diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.rst similarity index 71% rename from Documentation/virt/kvm/api.txt rename to Documentation/virt/kvm/api.rst index c6e1ce5d40de..97a72a53fa4b 100644 --- a/Documentation/virt/kvm/api.txt +++ b/Documentation/virt/kvm/api.rst @@ -1,8 +1,11 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================================================================== The Definitive KVM (Kernel-based Virtual Machine) API Documentation =================================================================== 1. General description ----------------------- +====================== The kvm API is a set of ioctls that are issued to control various aspects of a virtual machine. The ioctls belong to the following classes: @@ -33,7 +36,7 @@ of a virtual machine. The ioctls belong to the following classes: was used to create the VM. 2. File descriptors -------------------- +=================== The kvm API is centered around file descriptors. An initial open("/dev/kvm") obtains a handle to the kvm subsystem; this handle @@ -70,7 +73,7 @@ the VM is shut down. 3. Extensions -------------- +============= As of Linux 2.6.22, the KVM ABI has been stabilized: no backward incompatible change are allowed. However, there is an extension @@ -84,13 +87,14 @@ set of ioctls is available for application use. 4. API description ------------------- +================== This section describes ioctls that can be used to control kvm guests. For each ioctl, the following information is provided along with a description: - Capability: which KVM extension provides this ioctl. Can be 'basic', + Capability: + which KVM extension provides this ioctl. Can be 'basic', which means that is will be provided by any kernel that supports API version 12 (see section 4.1), a KVM_CAP_xyz constant, which means availability needs to be checked with KVM_CHECK_EXTENSION @@ -99,24 +103,29 @@ description: availability: for kernels that don't support the ioctl, the ioctl returns -ENOTTY. - Architectures: which instruction set architectures provide this ioctl. + Architectures: + which instruction set architectures provide this ioctl. x86 includes both i386 and x86_64. - Type: system, vm, or vcpu. + Type: + system, vm, or vcpu. - Parameters: what parameters are accepted by the ioctl. + Parameters: + what parameters are accepted by the ioctl. - Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL) + Returns: + the return value. General error numbers (EBADF, ENOMEM, EINVAL) are not detailed, but errors with specific meanings are. 4.1 KVM_GET_API_VERSION +----------------------- -Capability: basic -Architectures: all -Type: system ioctl -Parameters: none -Returns: the constant KVM_API_VERSION (=12) +:Capability: basic +:Architectures: all +:Type: system ioctl +:Parameters: none +:Returns: the constant KVM_API_VERSION (=12) This identifies the API version as the stable kvm API. It is not expected that this number will change. However, Linux 2.6.20 and @@ -127,12 +136,13 @@ described as 'basic' will be available. 4.2 KVM_CREATE_VM +----------------- -Capability: basic -Architectures: all -Type: system ioctl -Parameters: machine type identifier (KVM_VM_*) -Returns: a VM fd that can be used to control the new virtual machine. +:Capability: basic +:Architectures: all +:Type: system ioctl +:Parameters: machine type identifier (KVM_VM_*) +:Returns: a VM fd that can be used to control the new virtual machine. The new VM has no virtual cpus and no memory. You probably want to use 0 as machine type. @@ -155,17 +165,17 @@ identifier, where IPA_Bits is the maximum width of any physical address used by the VM. The IPA_Bits is encoded in bits[7-0] of the machine type identifier. -e.g, to configure a guest to use 48bit physical address size : +e.g, to configure a guest to use 48bit physical address size:: vm_fd = ioctl(dev_fd, KVM_CREATE_VM, KVM_VM_TYPE_ARM_IPA_SIZE(48)); -The requested size (IPA_Bits) must be : - 0 - Implies default size, 40bits (for backward compatibility) +The requested size (IPA_Bits) must be: - or - - N - Implies N bits, where N is a positive integer such that, + == ========================================================= + 0 Implies default size, 40bits (for backward compatibility) + N Implies N bits, where N is a positive integer such that, 32 <= N <= Host_IPA_Limit + == ========================================================= Host_IPA_Limit is the maximum possible value for IPA_Bits on the host and is dependent on the CPU capability and the kernel configuration. The limit can @@ -179,21 +189,28 @@ host physical address translations). 4.3 KVM_GET_MSR_INDEX_LIST, KVM_GET_MSR_FEATURE_INDEX_LIST +---------------------------------------------------------- + +:Capability: basic, KVM_CAP_GET_MSR_FEATURES for KVM_GET_MSR_FEATURE_INDEX_LIST +:Architectures: x86 +:Type: system ioctl +:Parameters: struct kvm_msr_list (in/out) +:Returns: 0 on success; -1 on error -Capability: basic, KVM_CAP_GET_MSR_FEATURES for KVM_GET_MSR_FEATURE_INDEX_LIST -Architectures: x86 -Type: system ioctl -Parameters: struct kvm_msr_list (in/out) -Returns: 0 on success; -1 on error Errors: - EFAULT: the msr index list cannot be read from or written to - E2BIG: the msr index list is to be to fit in the array specified by + + ====== ============================================================ + EFAULT the msr index list cannot be read from or written to + E2BIG the msr index list is to be to fit in the array specified by the user. + ====== ============================================================ -struct kvm_msr_list { +:: + + struct kvm_msr_list { __u32 nmsrs; /* number of msrs in entries */ __u32 indices[0]; -}; + }; The user fills in the size of the indices array in nmsrs, and in return kvm adjusts nmsrs to reflect the actual number of msrs and fills in the @@ -214,12 +231,13 @@ otherwise. 4.4 KVM_CHECK_EXTENSION +----------------------- -Capability: basic, KVM_CAP_CHECK_EXTENSION_VM for vm ioctl -Architectures: all -Type: system ioctl, vm ioctl -Parameters: extension identifier (KVM_CAP_*) -Returns: 0 if unsupported; 1 (or some other positive integer) if supported +:Capability: basic, KVM_CAP_CHECK_EXTENSION_VM for vm ioctl +:Architectures: all +:Type: system ioctl, vm ioctl +:Parameters: extension identifier (KVM_CAP_*) +:Returns: 0 if unsupported; 1 (or some other positive integer) if supported The API allows the application to query about extensions to the core kvm API. Userspace passes an extension identifier (an integer) and @@ -232,12 +250,13 @@ It is thus encouraged to use the vm ioctl to query for capabilities (available with KVM_CAP_CHECK_EXTENSION_VM on the vm fd) 4.5 KVM_GET_VCPU_MMAP_SIZE +-------------------------- -Capability: basic -Architectures: all -Type: system ioctl -Parameters: none -Returns: size of vcpu mmap area, in bytes +:Capability: basic +:Architectures: all +:Type: system ioctl +:Parameters: none +:Returns: size of vcpu mmap area, in bytes The KVM_RUN ioctl (cf.) communicates with userspace via a shared memory region. This ioctl returns the size of that region. See the @@ -245,23 +264,25 @@ KVM_RUN documentation for details. 4.6 KVM_SET_MEMORY_REGION +------------------------- -Capability: basic -Architectures: all -Type: vm ioctl -Parameters: struct kvm_memory_region (in) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: all +:Type: vm ioctl +:Parameters: struct kvm_memory_region (in) +:Returns: 0 on success, -1 on error This ioctl is obsolete and has been removed. 4.7 KVM_CREATE_VCPU +------------------- -Capability: basic -Architectures: all -Type: vm ioctl -Parameters: vcpu id (apic id on x86) -Returns: vcpu fd on success, -1 on error +:Capability: basic +:Architectures: all +:Type: vm ioctl +:Parameters: vcpu id (apic id on x86) +:Returns: vcpu fd on success, -1 on error This API adds a vcpu to a virtual machine. No more than max_vcpus may be added. The vcpu id is an integer in the range [0, max_vcpu_id). @@ -302,22 +323,25 @@ cpu's hardware control block. 4.8 KVM_GET_DIRTY_LOG (vm ioctl) +-------------------------------- -Capability: basic -Architectures: all -Type: vm ioctl -Parameters: struct kvm_dirty_log (in/out) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: all +:Type: vm ioctl +:Parameters: struct kvm_dirty_log (in/out) +:Returns: 0 on success, -1 on error -/* for KVM_GET_DIRTY_LOG */ -struct kvm_dirty_log { +:: + + /* for KVM_GET_DIRTY_LOG */ + struct kvm_dirty_log { __u32 slot; __u32 padding; union { void __user *dirty_bitmap; /* one bit per page */ __u64 padding; }; -}; + }; Given a memory slot, return a bitmap containing any pages dirtied since the last call to this ioctl. Bit 0 is the first page in the @@ -334,25 +358,31 @@ KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 is enabled. For more information, see the description of the capability. 4.9 KVM_SET_MEMORY_ALIAS +------------------------ -Capability: basic -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_memory_alias (in) -Returns: 0 (success), -1 (error) +:Capability: basic +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_memory_alias (in) +:Returns: 0 (success), -1 (error) This ioctl is obsolete and has been removed. 4.10 KVM_RUN +------------ + +:Capability: basic +:Architectures: all +:Type: vcpu ioctl +:Parameters: none +:Returns: 0 on success, -1 on error -Capability: basic -Architectures: all -Type: vcpu ioctl -Parameters: none -Returns: 0 on success, -1 on error Errors: - EINTR: an unmasked signal is pending + + ===== ============================= + EINTR an unmasked signal is pending + ===== ============================= This ioctl is used to run a guest virtual cpu. While there are no explicit parameters, there is an implicit parameter block that can be @@ -362,42 +392,46 @@ kvm_run' (see below). 4.11 KVM_GET_REGS +----------------- -Capability: basic -Architectures: all except ARM, arm64 -Type: vcpu ioctl -Parameters: struct kvm_regs (out) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: all except ARM, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_regs (out) +:Returns: 0 on success, -1 on error Reads the general purpose registers from the vcpu. -/* x86 */ -struct kvm_regs { +:: + + /* x86 */ + struct kvm_regs { /* out (KVM_GET_REGS) / in (KVM_SET_REGS) */ __u64 rax, rbx, rcx, rdx; __u64 rsi, rdi, rsp, rbp; __u64 r8, r9, r10, r11; __u64 r12, r13, r14, r15; __u64 rip, rflags; -}; + }; -/* mips */ -struct kvm_regs { + /* mips */ + struct kvm_regs { /* out (KVM_GET_REGS) / in (KVM_SET_REGS) */ __u64 gpr[32]; __u64 hi; __u64 lo; __u64 pc; -}; + }; 4.12 KVM_SET_REGS +----------------- -Capability: basic -Architectures: all except ARM, arm64 -Type: vcpu ioctl -Parameters: struct kvm_regs (in) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: all except ARM, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_regs (in) +:Returns: 0 on success, -1 on error Writes the general purpose registers into the vcpu. @@ -405,17 +439,20 @@ See KVM_GET_REGS for the data structure. 4.13 KVM_GET_SREGS +------------------ -Capability: basic -Architectures: x86, ppc -Type: vcpu ioctl -Parameters: struct kvm_sregs (out) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: x86, ppc +:Type: vcpu ioctl +:Parameters: struct kvm_sregs (out) +:Returns: 0 on success, -1 on error Reads special registers from the vcpu. -/* x86 */ -struct kvm_sregs { +:: + + /* x86 */ + struct kvm_sregs { struct kvm_segment cs, ds, es, fs, gs, ss; struct kvm_segment tr, ldt; struct kvm_dtable gdt, idt; @@ -423,9 +460,9 @@ struct kvm_sregs { __u64 efer; __u64 apic_base; __u64 interrupt_bitmap[(KVM_NR_INTERRUPTS + 63) / 64]; -}; + }; -/* ppc -- see arch/powerpc/include/uapi/asm/kvm.h */ + /* ppc -- see arch/powerpc/include/uapi/asm/kvm.h */ interrupt_bitmap is a bitmap of pending external interrupts. At most one bit may be set. This interrupt has been acknowledged by the APIC @@ -433,29 +470,33 @@ but not yet injected into the cpu core. 4.14 KVM_SET_SREGS +------------------ -Capability: basic -Architectures: x86, ppc -Type: vcpu ioctl -Parameters: struct kvm_sregs (in) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: x86, ppc +:Type: vcpu ioctl +:Parameters: struct kvm_sregs (in) +:Returns: 0 on success, -1 on error Writes special registers into the vcpu. See KVM_GET_SREGS for the data structures. 4.15 KVM_TRANSLATE +------------------ -Capability: basic -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_translation (in/out) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_translation (in/out) +:Returns: 0 on success, -1 on error Translates a virtual address according to the vcpu's current address translation mode. -struct kvm_translation { +:: + + struct kvm_translation { /* in */ __u64 linear_address; @@ -465,59 +506,68 @@ struct kvm_translation { __u8 writeable; __u8 usermode; __u8 pad[5]; -}; + }; 4.16 KVM_INTERRUPT +------------------ -Capability: basic -Architectures: x86, ppc, mips -Type: vcpu ioctl -Parameters: struct kvm_interrupt (in) -Returns: 0 on success, negative on failure. +:Capability: basic +:Architectures: x86, ppc, mips +:Type: vcpu ioctl +:Parameters: struct kvm_interrupt (in) +:Returns: 0 on success, negative on failure. Queues a hardware interrupt vector to be injected. -/* for KVM_INTERRUPT */ -struct kvm_interrupt { +:: + + /* for KVM_INTERRUPT */ + struct kvm_interrupt { /* in */ __u32 irq; -}; + }; X86: +^^^^ -Returns: 0 on success, - -EEXIST if an interrupt is already enqueued - -EINVAL the the irq number is invalid - -ENXIO if the PIC is in the kernel - -EFAULT if the pointer is invalid +:Returns: + + ========= =================================== + 0 on success, + -EEXIST if an interrupt is already enqueued + -EINVAL the the irq number is invalid + -ENXIO if the PIC is in the kernel + -EFAULT if the pointer is invalid + ========= =================================== Note 'irq' is an interrupt vector, not an interrupt pin or line. This ioctl is useful if the in-kernel PIC is not used. PPC: +^^^^ Queues an external interrupt to be injected. This ioctl is overleaded with 3 different irq values: a) KVM_INTERRUPT_SET - This injects an edge type external interrupt into the guest once it's ready - to receive interrupts. When injected, the interrupt is done. + This injects an edge type external interrupt into the guest once it's ready + to receive interrupts. When injected, the interrupt is done. b) KVM_INTERRUPT_UNSET - This unsets any pending interrupt. + This unsets any pending interrupt. - Only available with KVM_CAP_PPC_UNSET_IRQ. + Only available with KVM_CAP_PPC_UNSET_IRQ. c) KVM_INTERRUPT_SET_LEVEL - This injects a level type external interrupt into the guest context. The - interrupt stays pending until a specific ioctl with KVM_INTERRUPT_UNSET - is triggered. + This injects a level type external interrupt into the guest context. The + interrupt stays pending until a specific ioctl with KVM_INTERRUPT_UNSET + is triggered. - Only available with KVM_CAP_PPC_IRQ_LEVEL. + Only available with KVM_CAP_PPC_IRQ_LEVEL. Note that any value for 'irq' other than the ones stated above is invalid and incurs unexpected behavior. @@ -525,6 +575,7 @@ and incurs unexpected behavior. This is an asynchronous vcpu ioctl and can be invoked from any thread. MIPS: +^^^^^ Queues an external interrupt to be injected into the virtual CPU. A negative interrupt number dequeues the interrupt. @@ -533,24 +584,26 @@ This is an asynchronous vcpu ioctl and can be invoked from any thread. 4.17 KVM_DEBUG_GUEST +-------------------- -Capability: basic -Architectures: none -Type: vcpu ioctl -Parameters: none) -Returns: -1 on error +:Capability: basic +:Architectures: none +:Type: vcpu ioctl +:Parameters: none) +:Returns: -1 on error Support for this has been removed. Use KVM_SET_GUEST_DEBUG instead. 4.18 KVM_GET_MSRS +----------------- -Capability: basic (vcpu), KVM_CAP_GET_MSR_FEATURES (system) -Architectures: x86 -Type: system ioctl, vcpu ioctl -Parameters: struct kvm_msrs (in/out) -Returns: number of msrs successfully returned; - -1 on error +:Capability: basic (vcpu), KVM_CAP_GET_MSR_FEATURES (system) +:Architectures: x86 +:Type: system ioctl, vcpu ioctl +:Parameters: struct kvm_msrs (in/out) +:Returns: number of msrs successfully returned; + -1 on error When used as a system ioctl: Reads the values of MSR-based features that are available for the VM. This @@ -562,18 +615,20 @@ When used as a vcpu ioctl: Reads model-specific registers from the vcpu. Supported msr indices can be obtained using KVM_GET_MSR_INDEX_LIST in a system ioctl. -struct kvm_msrs { +:: + + struct kvm_msrs { __u32 nmsrs; /* number of msrs in entries */ __u32 pad; struct kvm_msr_entry entries[0]; -}; + }; -struct kvm_msr_entry { + struct kvm_msr_entry { __u32 index; __u32 reserved; __u64 data; -}; + }; Application code should set the 'nmsrs' member (which indicates the size of the entries array) and the 'index' member of each array entry. @@ -581,12 +636,13 @@ kvm will fill in the 'data' member. 4.19 KVM_SET_MSRS +----------------- -Capability: basic -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_msrs (in) -Returns: number of msrs successfully set (see below), -1 on error +:Capability: basic +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_msrs (in) +:Returns: number of msrs successfully set (see below), -1 on error Writes model-specific registers to the vcpu. See KVM_GET_MSRS for the data structures. @@ -602,41 +658,44 @@ MSRs that have been set successfully. 4.20 KVM_SET_CPUID +------------------ -Capability: basic -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_cpuid (in) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_cpuid (in) +:Returns: 0 on success, -1 on error Defines the vcpu responses to the cpuid instruction. Applications should use the KVM_SET_CPUID2 ioctl if available. +:: -struct kvm_cpuid_entry { + struct kvm_cpuid_entry { __u32 function; __u32 eax; __u32 ebx; __u32 ecx; __u32 edx; __u32 padding; -}; + }; -/* for KVM_SET_CPUID */ -struct kvm_cpuid { + /* for KVM_SET_CPUID */ + struct kvm_cpuid { __u32 nent; __u32 padding; struct kvm_cpuid_entry entries[0]; -}; + }; 4.21 KVM_SET_SIGNAL_MASK +------------------------ -Capability: basic -Architectures: all -Type: vcpu ioctl -Parameters: struct kvm_signal_mask (in) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: all +:Type: vcpu ioctl +:Parameters: struct kvm_signal_mask (in) +:Returns: 0 on success, -1 on error Defines which signals are blocked during execution of KVM_RUN. This signal mask temporarily overrides the threads signal mask. Any @@ -646,25 +705,30 @@ their traditional behaviour) will cause KVM_RUN to return with -EINTR. Note the signal will only be delivered if not blocked by the original signal mask. -/* for KVM_SET_SIGNAL_MASK */ -struct kvm_signal_mask { +:: + + /* for KVM_SET_SIGNAL_MASK */ + struct kvm_signal_mask { __u32 len; __u8 sigset[0]; -}; + }; 4.22 KVM_GET_FPU +---------------- -Capability: basic -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_fpu (out) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_fpu (out) +:Returns: 0 on success, -1 on error Reads the floating point state from the vcpu. -/* for KVM_GET_FPU and KVM_SET_FPU */ -struct kvm_fpu { +:: + + /* for KVM_GET_FPU and KVM_SET_FPU */ + struct kvm_fpu { __u8 fpr[8][16]; __u16 fcw; __u16 fsw; @@ -676,21 +740,24 @@ struct kvm_fpu { __u8 xmm[16][16]; __u32 mxcsr; __u32 pad2; -}; + }; 4.23 KVM_SET_FPU +---------------- -Capability: basic -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_fpu (in) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_fpu (in) +:Returns: 0 on success, -1 on error Writes the floating point state to the vcpu. -/* for KVM_GET_FPU and KVM_SET_FPU */ -struct kvm_fpu { +:: + + /* for KVM_GET_FPU and KVM_SET_FPU */ + struct kvm_fpu { __u8 fpr[8][16]; __u16 fcw; __u16 fsw; @@ -702,16 +769,17 @@ struct kvm_fpu { __u8 xmm[16][16]; __u32 mxcsr; __u32 pad2; -}; + }; 4.24 KVM_CREATE_IRQCHIP +----------------------- -Capability: KVM_CAP_IRQCHIP, KVM_CAP_S390_IRQCHIP (s390) -Architectures: x86, ARM, arm64, s390 -Type: vm ioctl -Parameters: none -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQCHIP, KVM_CAP_S390_IRQCHIP (s390) +:Architectures: x86, ARM, arm64, s390 +:Type: vm ioctl +:Parameters: none +:Returns: 0 on success, -1 on error Creates an interrupt controller model in the kernel. On x86, creates a virtual ioapic, a virtual PIC (two PICs, nested), and sets up @@ -727,12 +795,13 @@ before KVM_CREATE_IRQCHIP can be used. 4.25 KVM_IRQ_LINE +----------------- -Capability: KVM_CAP_IRQCHIP -Architectures: x86, arm, arm64 -Type: vm ioctl -Parameters: struct kvm_irq_level -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQCHIP +:Architectures: x86, arm, arm64 +:Type: vm ioctl +:Parameters: struct kvm_irq_level +:Returns: 0 on success, -1 on error Sets the level of a GSI input to the interrupt controller model in the kernel. On some architectures it is required that an interrupt controller model has @@ -756,16 +825,20 @@ of course). ARM/arm64 can signal an interrupt either at the CPU level, or at the in-kernel irqchip (GIC), and for in-kernel irqchip can tell the GIC to use PPIs designated for specific cpus. The irq field is interpreted -like this: +like this::  bits: | 31 ... 28 | 27 ... 24 | 23 ... 16 | 15 ... 0 | field: | vcpu2_index | irq_type | vcpu_index | irq_id | The irq_type field has the following values: -- irq_type[0]: out-of-kernel GIC: irq_id 0 is IRQ, irq_id 1 is FIQ -- irq_type[1]: in-kernel GIC: SPI, irq_id between 32 and 1019 (incl.) + +- irq_type[0]: + out-of-kernel GIC: irq_id 0 is IRQ, irq_id 1 is FIQ +- irq_type[1]: + in-kernel GIC: SPI, irq_id between 32 and 1019 (incl.) (the vcpu_index field is ignored) -- irq_type[2]: in-kernel GIC: PPI, irq_id between 16 and 31 (incl.) +- irq_type[2]: + in-kernel GIC: PPI, irq_id between 16 and 31 (incl.) (The irq_id field thus corresponds nicely to the IRQ ID in the ARM GIC specs) @@ -779,27 +852,32 @@ Note that on arm/arm64, the KVM_CAP_IRQCHIP capability only conditions injection of interrupts for the in-kernel irqchip. KVM_IRQ_LINE can always be used for a userspace interrupt controller. -struct kvm_irq_level { +:: + + struct kvm_irq_level { union { __u32 irq; /* GSI */ __s32 status; /* not used for KVM_IRQ_LEVEL */ }; __u32 level; /* 0 or 1 */ -}; + }; 4.26 KVM_GET_IRQCHIP +-------------------- -Capability: KVM_CAP_IRQCHIP -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_irqchip (in/out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQCHIP +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_irqchip (in/out) +:Returns: 0 on success, -1 on error Reads the state of a kernel interrupt controller created with KVM_CREATE_IRQCHIP into a buffer provided by the caller. -struct kvm_irqchip { +:: + + struct kvm_irqchip { __u32 chip_id; /* 0 = PIC1, 1 = PIC2, 2 = IOAPIC */ __u32 pad; union { @@ -807,21 +885,24 @@ struct kvm_irqchip { struct kvm_pic_state pic; struct kvm_ioapic_state ioapic; } chip; -}; + }; 4.27 KVM_SET_IRQCHIP +-------------------- -Capability: KVM_CAP_IRQCHIP -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_irqchip (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQCHIP +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_irqchip (in) +:Returns: 0 on success, -1 on error Sets the state of a kernel interrupt controller created with KVM_CREATE_IRQCHIP from a buffer provided by the caller. -struct kvm_irqchip { +:: + + struct kvm_irqchip { __u32 chip_id; /* 0 = PIC1, 1 = PIC2, 2 = IOAPIC */ __u32 pad; union { @@ -829,16 +910,17 @@ struct kvm_irqchip { struct kvm_pic_state pic; struct kvm_ioapic_state ioapic; } chip; -}; + }; 4.28 KVM_XEN_HVM_CONFIG +----------------------- -Capability: KVM_CAP_XEN_HVM -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_xen_hvm_config (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_XEN_HVM +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_xen_hvm_config (in) +:Returns: 0 on success, -1 on error Sets the MSR that the Xen HVM guest uses to initialize its hypercall page, and provides the starting address and size of the hypercall @@ -846,7 +928,9 @@ blobs in userspace. When the guest writes the MSR, kvm copies one page of a blob (32- or 64-bit, depending on the vcpu mode) to guest memory. -struct kvm_xen_hvm_config { +:: + + struct kvm_xen_hvm_config { __u32 flags; __u32 msr; __u64 blob_addr_32; @@ -854,16 +938,17 @@ struct kvm_xen_hvm_config { __u8 blob_size_32; __u8 blob_size_64; __u8 pad2[30]; -}; + }; 4.29 KVM_GET_CLOCK +------------------ -Capability: KVM_CAP_ADJUST_CLOCK -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_clock_data (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_ADJUST_CLOCK +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_clock_data (out) +:Returns: 0 on success, -1 on error Gets the current timestamp of kvmclock as seen by the current guest. In conjunction with KVM_SET_CLOCK, it is used to ensure monotonicity on scenarios @@ -880,47 +965,56 @@ with KVM_SET_CLOCK. KVM will try to make all VCPUs follow this clock, but the exact value read by each VCPU could differ, because the host TSC is not stable. -struct kvm_clock_data { +:: + + struct kvm_clock_data { __u64 clock; /* kvmclock current value */ __u32 flags; __u32 pad[9]; -}; + }; 4.30 KVM_SET_CLOCK +------------------ -Capability: KVM_CAP_ADJUST_CLOCK -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_clock_data (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_ADJUST_CLOCK +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_clock_data (in) +:Returns: 0 on success, -1 on error Sets the current timestamp of kvmclock to the value specified in its parameter. In conjunction with KVM_GET_CLOCK, it is used to ensure monotonicity on scenarios such as migration. -struct kvm_clock_data { +:: + + struct kvm_clock_data { __u64 clock; /* kvmclock current value */ __u32 flags; __u32 pad[9]; -}; + }; 4.31 KVM_GET_VCPU_EVENTS +------------------------ -Capability: KVM_CAP_VCPU_EVENTS -Extended by: KVM_CAP_INTR_SHADOW -Architectures: x86, arm, arm64 -Type: vcpu ioctl -Parameters: struct kvm_vcpu_event (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_VCPU_EVENTS +:Extended by: KVM_CAP_INTR_SHADOW +:Architectures: x86, arm, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_vcpu_event (out) +:Returns: 0 on success, -1 on error X86: +^^^^ Gets currently pending exceptions, interrupts, and NMIs as well as related states of the vcpu. -struct kvm_vcpu_events { +:: + + struct kvm_vcpu_events { struct { __u8 injected; __u8 nr; @@ -951,7 +1045,7 @@ struct kvm_vcpu_events { __u8 reserved[27]; __u8 exception_has_payload; __u64 exception_payload; -}; + }; The following bits are defined in the flags field: @@ -967,6 +1061,7 @@ The following bits are defined in the flags field: KVM_CAP_EXCEPTION_PAYLOAD is enabled. ARM/ARM64: +^^^^^^^^^^ If the guest accesses a device that is being emulated by the host kernel in such a way that a real device would generate a physical SError, KVM may make @@ -1006,8 +1101,9 @@ It is not possible to read back a pending external abort (injected via KVM_SET_VCPU_EVENTS or otherwise) because such an exception is always delivered directly to the virtual CPU). +:: -struct kvm_vcpu_events { + struct kvm_vcpu_events { struct { __u8 serror_pending; __u8 serror_has_esr; @@ -1017,18 +1113,20 @@ struct kvm_vcpu_events { __u64 serror_esr; } exception; __u32 reserved[12]; -}; + }; 4.32 KVM_SET_VCPU_EVENTS +------------------------ -Capability: KVM_CAP_VCPU_EVENTS -Extended by: KVM_CAP_INTR_SHADOW -Architectures: x86, arm, arm64 -Type: vcpu ioctl -Parameters: struct kvm_vcpu_event (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_VCPU_EVENTS +:Extended by: KVM_CAP_INTR_SHADOW +:Architectures: x86, arm, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_vcpu_event (in) +:Returns: 0 on success, -1 on error X86: +^^^^ Set pending exceptions, interrupts, and NMIs as well as related states of the vcpu. @@ -1040,9 +1138,11 @@ from the update. These fields are nmi.pending, sipi_vector, smi.smm, smi.pending. Keep the corresponding bits in the flags field cleared to suppress overwriting the current in-kernel state. The bits are: -KVM_VCPUEVENT_VALID_NMI_PENDING - transfer nmi.pending to the kernel -KVM_VCPUEVENT_VALID_SIPI_VECTOR - transfer sipi_vector -KVM_VCPUEVENT_VALID_SMM - transfer the smi sub-struct. +=============================== ================================== +KVM_VCPUEVENT_VALID_NMI_PENDING transfer nmi.pending to the kernel +KVM_VCPUEVENT_VALID_SIPI_VECTOR transfer sipi_vector +KVM_VCPUEVENT_VALID_SMM transfer the smi sub-struct. +=============================== ================================== If KVM_CAP_INTR_SHADOW is available, KVM_VCPUEVENT_VALID_SHADOW can be set in the flags field to signal that interrupt.shadow contains a valid state and @@ -1056,6 +1156,7 @@ exception_has_payload, exception_payload, and exception.pending fields contain a valid state and shall be written into the VCPU. ARM/ARM64: +^^^^^^^^^^ User space may need to inject several types of events to the guest. @@ -1078,31 +1179,35 @@ See KVM_GET_VCPU_EVENTS for the data structure. 4.33 KVM_GET_DEBUGREGS +---------------------- -Capability: KVM_CAP_DEBUGREGS -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_debugregs (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_DEBUGREGS +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_debugregs (out) +:Returns: 0 on success, -1 on error Reads debug registers from the vcpu. -struct kvm_debugregs { +:: + + struct kvm_debugregs { __u64 db[4]; __u64 dr6; __u64 dr7; __u64 flags; __u64 reserved[9]; -}; + }; 4.34 KVM_SET_DEBUGREGS +---------------------- -Capability: KVM_CAP_DEBUGREGS -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_debugregs (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_DEBUGREGS +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_debugregs (in) +:Returns: 0 on success, -1 on error Writes debug registers into the vcpu. @@ -1111,24 +1216,27 @@ yet and must be cleared on entry. 4.35 KVM_SET_USER_MEMORY_REGION +------------------------------- -Capability: KVM_CAP_USER_MEMORY -Architectures: all -Type: vm ioctl -Parameters: struct kvm_userspace_memory_region (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_USER_MEMORY +:Architectures: all +:Type: vm ioctl +:Parameters: struct kvm_userspace_memory_region (in) +:Returns: 0 on success, -1 on error -struct kvm_userspace_memory_region { +:: + + struct kvm_userspace_memory_region { __u32 slot; __u32 flags; __u64 guest_phys_addr; __u64 memory_size; /* bytes */ __u64 userspace_addr; /* start of the userspace allocated memory */ -}; + }; -/* for kvm_memory_region::flags */ -#define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) -#define KVM_MEM_READONLY (1UL << 1) + /* for kvm_memory_region::flags */ + #define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) + #define KVM_MEM_READONLY (1UL << 1) This ioctl allows the user to create, modify or delete a guest physical memory slot. Bits 0-15 of "slot" specify the slot id and this value @@ -1174,12 +1282,13 @@ allocation and is deprecated. 4.36 KVM_SET_TSS_ADDR +--------------------- -Capability: KVM_CAP_SET_TSS_ADDR -Architectures: x86 -Type: vm ioctl -Parameters: unsigned long tss_address (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_SET_TSS_ADDR +:Architectures: x86 +:Type: vm ioctl +:Parameters: unsigned long tss_address (in) +:Returns: 0 on success, -1 on error This ioctl defines the physical address of a three-page region in the guest physical address space. The region must be within the first 4GB of the @@ -1193,21 +1302,24 @@ documentation when it pops into existence). 4.37 KVM_ENABLE_CAP +------------------- -Capability: KVM_CAP_ENABLE_CAP -Architectures: mips, ppc, s390 -Type: vcpu ioctl -Parameters: struct kvm_enable_cap (in) -Returns: 0 on success; -1 on error +:Capability: KVM_CAP_ENABLE_CAP +:Architectures: mips, ppc, s390 +:Type: vcpu ioctl +:Parameters: struct kvm_enable_cap (in) +:Returns: 0 on success; -1 on error -Capability: KVM_CAP_ENABLE_CAP_VM -Architectures: all -Type: vcpu ioctl -Parameters: struct kvm_enable_cap (in) -Returns: 0 on success; -1 on error +:Capability: KVM_CAP_ENABLE_CAP_VM +:Architectures: all +:Type: vcpu ioctl +:Parameters: struct kvm_enable_cap (in) +:Returns: 0 on success; -1 on error -+Not all extensions are enabled by default. Using this ioctl the application -can enable an extension, making it available to the guest. +.. note:: + + Not all extensions are enabled by default. Using this ioctl the application + can enable an extension, making it available to the guest. On systems that do not support this ioctl, it always fails. On systems that do support it, it only works for extensions that are supported for enablement. @@ -1215,76 +1327,91 @@ do support it, it only works for extensions that are supported for enablement. To check if a capability can be enabled, the KVM_CHECK_EXTENSION ioctl should be used. -struct kvm_enable_cap { +:: + + struct kvm_enable_cap { /* in */ __u32 cap; The capability that is supposed to get enabled. +:: + __u32 flags; A bitfield indicating future enhancements. Has to be 0 for now. +:: + __u64 args[4]; Arguments for enabling a feature. If a feature needs initial values to function properly, this is the place to put them. +:: + __u8 pad[64]; -}; + }; The vcpu ioctl should be used for vcpu-specific capabilities, the vm ioctl for vm-wide capabilities. 4.38 KVM_GET_MP_STATE +--------------------- -Capability: KVM_CAP_MP_STATE -Architectures: x86, s390, arm, arm64 -Type: vcpu ioctl -Parameters: struct kvm_mp_state (out) -Returns: 0 on success; -1 on error +:Capability: KVM_CAP_MP_STATE +:Architectures: x86, s390, arm, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_mp_state (out) +:Returns: 0 on success; -1 on error -struct kvm_mp_state { +:: + + struct kvm_mp_state { __u32 mp_state; -}; + }; Returns the vcpu's current "multiprocessing state" (though also valid on uniprocessor guests). Possible values are: - - KVM_MP_STATE_RUNNABLE: the vcpu is currently running [x86,arm/arm64] - - KVM_MP_STATE_UNINITIALIZED: the vcpu is an application processor (AP) + ========================== =============================================== + KVM_MP_STATE_RUNNABLE the vcpu is currently running [x86,arm/arm64] + KVM_MP_STATE_UNINITIALIZED the vcpu is an application processor (AP) which has not yet received an INIT signal [x86] - - KVM_MP_STATE_INIT_RECEIVED: the vcpu has received an INIT signal, and is + KVM_MP_STATE_INIT_RECEIVED the vcpu has received an INIT signal, and is now ready for a SIPI [x86] - - KVM_MP_STATE_HALTED: the vcpu has executed a HLT instruction and + KVM_MP_STATE_HALTED the vcpu has executed a HLT instruction and is waiting for an interrupt [x86] - - KVM_MP_STATE_SIPI_RECEIVED: the vcpu has just received a SIPI (vector + KVM_MP_STATE_SIPI_RECEIVED the vcpu has just received a SIPI (vector accessible via KVM_GET_VCPU_EVENTS) [x86] - - KVM_MP_STATE_STOPPED: the vcpu is stopped [s390,arm/arm64] - - KVM_MP_STATE_CHECK_STOP: the vcpu is in a special error state [s390] - - KVM_MP_STATE_OPERATING: the vcpu is operating (running or halted) + KVM_MP_STATE_STOPPED the vcpu is stopped [s390,arm/arm64] + KVM_MP_STATE_CHECK_STOP the vcpu is in a special error state [s390] + KVM_MP_STATE_OPERATING the vcpu is operating (running or halted) [s390] - - KVM_MP_STATE_LOAD: the vcpu is in a special load/startup state + KVM_MP_STATE_LOAD the vcpu is in a special load/startup state [s390] + ========================== =============================================== On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an in-kernel irqchip, the multiprocessing state must be maintained by userspace on these architectures. For arm/arm64: +^^^^^^^^^^^^^^ The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not. 4.39 KVM_SET_MP_STATE +--------------------- -Capability: KVM_CAP_MP_STATE -Architectures: x86, s390, arm, arm64 -Type: vcpu ioctl -Parameters: struct kvm_mp_state (in) -Returns: 0 on success; -1 on error +:Capability: KVM_CAP_MP_STATE +:Architectures: x86, s390, arm, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_mp_state (in) +:Returns: 0 on success; -1 on error Sets the vcpu's current "multiprocessing state"; see KVM_GET_MP_STATE for arguments. @@ -1294,17 +1421,19 @@ in-kernel irqchip, the multiprocessing state must be maintained by userspace on these architectures. For arm/arm64: +^^^^^^^^^^^^^^ The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not. 4.40 KVM_SET_IDENTITY_MAP_ADDR +------------------------------ -Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR -Architectures: x86 -Type: vm ioctl -Parameters: unsigned long identity (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR +:Architectures: x86 +:Type: vm ioctl +:Parameters: unsigned long identity (in) +:Returns: 0 on success, -1 on error This ioctl defines the physical address of a one-page region in the guest physical address space. The region must be within the first 4GB of the @@ -1322,12 +1451,13 @@ documentation when it pops into existence). Fails if any VCPU has already been created. 4.41 KVM_SET_BOOT_CPU_ID +------------------------ -Capability: KVM_CAP_SET_BOOT_CPU_ID -Architectures: x86 -Type: vm ioctl -Parameters: unsigned long vcpu_id -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_SET_BOOT_CPU_ID +:Architectures: x86 +:Type: vm ioctl +:Parameters: unsigned long vcpu_id +:Returns: 0 on success, -1 on error Define which vcpu is the Bootstrap Processor (BSP). Values are the same as the vcpu id in KVM_CREATE_VCPU. If this ioctl is not called, the default @@ -1335,102 +1465,119 @@ is vcpu 0. 4.42 KVM_GET_XSAVE +------------------ -Capability: KVM_CAP_XSAVE -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_xsave (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_XSAVE +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_xsave (out) +:Returns: 0 on success, -1 on error -struct kvm_xsave { + +:: + + struct kvm_xsave { __u32 region[1024]; -}; + }; This ioctl would copy current vcpu's xsave struct to the userspace. 4.43 KVM_SET_XSAVE +------------------ -Capability: KVM_CAP_XSAVE -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_xsave (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_XSAVE +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_xsave (in) +:Returns: 0 on success, -1 on error -struct kvm_xsave { +:: + + + struct kvm_xsave { __u32 region[1024]; -}; + }; This ioctl would copy userspace's xsave struct to the kernel. 4.44 KVM_GET_XCRS +----------------- -Capability: KVM_CAP_XCRS -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_xcrs (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_XCRS +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_xcrs (out) +:Returns: 0 on success, -1 on error -struct kvm_xcr { +:: + + struct kvm_xcr { __u32 xcr; __u32 reserved; __u64 value; -}; + }; -struct kvm_xcrs { + struct kvm_xcrs { __u32 nr_xcrs; __u32 flags; struct kvm_xcr xcrs[KVM_MAX_XCRS]; __u64 padding[16]; -}; + }; This ioctl would copy current vcpu's xcrs to the userspace. 4.45 KVM_SET_XCRS +----------------- -Capability: KVM_CAP_XCRS -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_xcrs (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_XCRS +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_xcrs (in) +:Returns: 0 on success, -1 on error -struct kvm_xcr { +:: + + struct kvm_xcr { __u32 xcr; __u32 reserved; __u64 value; -}; + }; -struct kvm_xcrs { + struct kvm_xcrs { __u32 nr_xcrs; __u32 flags; struct kvm_xcr xcrs[KVM_MAX_XCRS]; __u64 padding[16]; -}; + }; This ioctl would set vcpu's xcr to the value userspace specified. 4.46 KVM_GET_SUPPORTED_CPUID +---------------------------- -Capability: KVM_CAP_EXT_CPUID -Architectures: x86 -Type: system ioctl -Parameters: struct kvm_cpuid2 (in/out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_EXT_CPUID +:Architectures: x86 +:Type: system ioctl +:Parameters: struct kvm_cpuid2 (in/out) +:Returns: 0 on success, -1 on error -struct kvm_cpuid2 { +:: + + struct kvm_cpuid2 { __u32 nent; __u32 padding; struct kvm_cpuid_entry2 entries[0]; -}; + }; -#define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) -#define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) -#define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) + #define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) + #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) + #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) -struct kvm_cpuid_entry2 { + struct kvm_cpuid_entry2 { __u32 function; __u32 index; __u32 flags; @@ -1439,7 +1586,7 @@ struct kvm_cpuid_entry2 { __u32 ecx; __u32 edx; __u32 padding[3]; -}; + }; This ioctl returns x86 cpuid features which are supported by both the hardware and kvm in its default configuration. Userspace can use the @@ -1467,10 +1614,16 @@ with unknown or unsupported features masked out. Some features (for example, x2apic), may not be present in the host cpu, but are exposed by kvm if it can emulate them efficiently. The fields in each entry are defined as follows: - function: the eax value used to obtain the entry - index: the ecx value used to obtain the entry (for entries that are + function: + the eax value used to obtain the entry + + index: + the ecx value used to obtain the entry (for entries that are affected by ecx) - flags: an OR of zero or more of the following: + + flags: + an OR of zero or more of the following: + KVM_CPUID_FLAG_SIGNIFCANT_INDEX: if the index field is valid KVM_CPUID_FLAG_STATEFUL_FUNC: @@ -1480,12 +1633,14 @@ emulate them efficiently. The fields in each entry are defined as follows: KVM_CPUID_FLAG_STATE_READ_NEXT: for KVM_CPUID_FLAG_STATEFUL_FUNC entries, set if this entry is the first entry to be read by a cpu - eax, ebx, ecx, edx: the values returned by the cpuid instruction for + + eax, ebx, ecx, edx: + the values returned by the cpuid instruction for this function/index combination The TSC deadline timer feature (CPUID leaf 1, ecx[24]) is always returned as false, since the feature depends on KVM_CREATE_IRQCHIP for local APIC -support. Instead it is reported via +support. Instead it is reported via:: ioctl(KVM_CHECK_EXTENSION, KVM_CAP_TSC_DEADLINE_TIMER) @@ -1494,18 +1649,21 @@ feature in userspace, then you can enable the feature for KVM_SET_CPUID2. 4.47 KVM_PPC_GET_PVINFO +----------------------- -Capability: KVM_CAP_PPC_GET_PVINFO -Architectures: ppc -Type: vm ioctl -Parameters: struct kvm_ppc_pvinfo (out) -Returns: 0 on success, !0 on error +:Capability: KVM_CAP_PPC_GET_PVINFO +:Architectures: ppc +:Type: vm ioctl +:Parameters: struct kvm_ppc_pvinfo (out) +:Returns: 0 on success, !0 on error -struct kvm_ppc_pvinfo { +:: + + struct kvm_ppc_pvinfo { __u32 flags; __u32 hcall[4]; __u8 pad[108]; -}; + }; This ioctl fetches PV specific information that need to be passed to the guest using the device tree or other means from vm context. @@ -1515,33 +1673,39 @@ The hcall array defines 4 instructions that make up a hypercall. If any additional field gets added to this structure later on, a bit for that additional piece of information will be set in the flags bitmap. -The flags bitmap is defined as: +The flags bitmap is defined as:: /* the host supports the ePAPR idle hcall #define KVM_PPC_PVINFO_FLAGS_EV_IDLE (1<<0) 4.52 KVM_SET_GSI_ROUTING +------------------------ -Capability: KVM_CAP_IRQ_ROUTING -Architectures: x86 s390 arm arm64 -Type: vm ioctl -Parameters: struct kvm_irq_routing (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQ_ROUTING +:Architectures: x86 s390 arm arm64 +:Type: vm ioctl +:Parameters: struct kvm_irq_routing (in) +:Returns: 0 on success, -1 on error Sets the GSI routing table entries, overwriting any previously set entries. On arm/arm64, GSI routing has the following limitation: + - GSI routing does not apply to KVM_IRQ_LINE but only to KVM_IRQFD. -struct kvm_irq_routing { +:: + + struct kvm_irq_routing { __u32 nr; __u32 flags; struct kvm_irq_routing_entry entries[0]; -}; + }; No flags are specified so far, the corresponding field must be set to zero. -struct kvm_irq_routing_entry { +:: + + struct kvm_irq_routing_entry { __u32 gsi; __u32 type; __u32 flags; @@ -1553,15 +1717,16 @@ struct kvm_irq_routing_entry { struct kvm_irq_routing_hv_sint hv_sint; __u32 pad[8]; } u; -}; + }; -/* gsi routing entry types */ -#define KVM_IRQ_ROUTING_IRQCHIP 1 -#define KVM_IRQ_ROUTING_MSI 2 -#define KVM_IRQ_ROUTING_S390_ADAPTER 3 -#define KVM_IRQ_ROUTING_HV_SINT 4 + /* gsi routing entry types */ + #define KVM_IRQ_ROUTING_IRQCHIP 1 + #define KVM_IRQ_ROUTING_MSI 2 + #define KVM_IRQ_ROUTING_S390_ADAPTER 3 + #define KVM_IRQ_ROUTING_HV_SINT 4 flags: + - KVM_MSI_VALID_DEVID: used along with KVM_IRQ_ROUTING_MSI routing entry type, specifies that the devid field contains a valid value. The per-VM KVM_CAP_MSI_DEVID capability advertises the requirement to provide @@ -1569,12 +1734,14 @@ flags: never set the KVM_MSI_VALID_DEVID flag as the ioctl might fail. - zero otherwise -struct kvm_irq_routing_irqchip { +:: + + struct kvm_irq_routing_irqchip { __u32 irqchip; __u32 pin; -}; + }; -struct kvm_irq_routing_msi { + struct kvm_irq_routing_msi { __u32 address_lo; __u32 address_hi; __u32 data; @@ -1582,7 +1749,7 @@ struct kvm_irq_routing_msi { __u32 pad; __u32 devid; }; -}; + }; If KVM_MSI_VALID_DEVID is set, devid contains a unique device identifier for the device that wrote the MSI message. For PCI, this is usually a @@ -1593,39 +1760,43 @@ feature of KVM_CAP_X2APIC_API capability is enabled. If it is enabled, address_hi bits 31-8 provide bits 31-8 of the destination id. Bits 7-0 of address_hi must be zero. -struct kvm_irq_routing_s390_adapter { +:: + + struct kvm_irq_routing_s390_adapter { __u64 ind_addr; __u64 summary_addr; __u64 ind_offset; __u32 summary_offset; __u32 adapter_id; -}; + }; -struct kvm_irq_routing_hv_sint { + struct kvm_irq_routing_hv_sint { __u32 vcpu; __u32 sint; -}; + }; 4.55 KVM_SET_TSC_KHZ +-------------------- -Capability: KVM_CAP_TSC_CONTROL -Architectures: x86 -Type: vcpu ioctl -Parameters: virtual tsc_khz -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_TSC_CONTROL +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: virtual tsc_khz +:Returns: 0 on success, -1 on error Specifies the tsc frequency for the virtual machine. The unit of the frequency is KHz. 4.56 KVM_GET_TSC_KHZ +-------------------- -Capability: KVM_CAP_GET_TSC_KHZ -Architectures: x86 -Type: vcpu ioctl -Parameters: none -Returns: virtual tsc-khz on success, negative value on error +:Capability: KVM_CAP_GET_TSC_KHZ +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: none +:Returns: virtual tsc-khz on success, negative value on error Returns the tsc frequency of the guest. The unit of the return value is KHz. If the host has unstable tsc this ioctl returns -EIO instead as an @@ -1633,17 +1804,20 @@ error. 4.57 KVM_GET_LAPIC +------------------ -Capability: KVM_CAP_IRQCHIP -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_lapic_state (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQCHIP +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_lapic_state (out) +:Returns: 0 on success, -1 on error -#define KVM_APIC_REG_SIZE 0x400 -struct kvm_lapic_state { +:: + + #define KVM_APIC_REG_SIZE 0x400 + struct kvm_lapic_state { char regs[KVM_APIC_REG_SIZE]; -}; + }; Reads the Local APIC registers and copies them into the input argument. The data format and layout are the same as documented in the architecture manual. @@ -1661,17 +1835,20 @@ always uses xAPIC format. 4.58 KVM_SET_LAPIC +------------------ -Capability: KVM_CAP_IRQCHIP -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_lapic_state (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQCHIP +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_lapic_state (in) +:Returns: 0 on success, -1 on error -#define KVM_APIC_REG_SIZE 0x400 -struct kvm_lapic_state { +:: + + #define KVM_APIC_REG_SIZE 0x400 + struct kvm_lapic_state { char regs[KVM_APIC_REG_SIZE]; -}; + }; Copies the input argument into the Local APIC registers. The data format and layout are the same as documented in the architecture manual. @@ -1682,35 +1859,38 @@ See the note in KVM_GET_LAPIC. 4.59 KVM_IOEVENTFD +------------------ -Capability: KVM_CAP_IOEVENTFD -Architectures: all -Type: vm ioctl -Parameters: struct kvm_ioeventfd (in) -Returns: 0 on success, !0 on error +:Capability: KVM_CAP_IOEVENTFD +:Architectures: all +:Type: vm ioctl +:Parameters: struct kvm_ioeventfd (in) +:Returns: 0 on success, !0 on error This ioctl attaches or detaches an ioeventfd to a legal pio/mmio address within the guest. A guest write in the registered address will signal the provided event instead of triggering an exit. -struct kvm_ioeventfd { +:: + + struct kvm_ioeventfd { __u64 datamatch; __u64 addr; /* legal pio/mmio address */ __u32 len; /* 0, 1, 2, 4, or 8 bytes */ __s32 fd; __u32 flags; __u8 pad[36]; -}; + }; For the special case of virtio-ccw devices on s390, the ioevent is matched to a subchannel/virtqueue tuple instead. -The following flags are defined: +The following flags are defined:: -#define KVM_IOEVENTFD_FLAG_DATAMATCH (1 << kvm_ioeventfd_flag_nr_datamatch) -#define KVM_IOEVENTFD_FLAG_PIO (1 << kvm_ioeventfd_flag_nr_pio) -#define KVM_IOEVENTFD_FLAG_DEASSIGN (1 << kvm_ioeventfd_flag_nr_deassign) -#define KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY \ + #define KVM_IOEVENTFD_FLAG_DATAMATCH (1 << kvm_ioeventfd_flag_nr_datamatch) + #define KVM_IOEVENTFD_FLAG_PIO (1 << kvm_ioeventfd_flag_nr_pio) + #define KVM_IOEVENTFD_FLAG_DEASSIGN (1 << kvm_ioeventfd_flag_nr_deassign) + #define KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY \ (1 << kvm_ioeventfd_flag_nr_virtio_ccw_notify) If datamatch flag is set, the event will be signaled only if the written value @@ -1725,17 +1905,20 @@ The speedup may only apply to specific architectures, but the ioeventfd will work anyway. 4.60 KVM_DIRTY_TLB +------------------ -Capability: KVM_CAP_SW_TLB -Architectures: ppc -Type: vcpu ioctl -Parameters: struct kvm_dirty_tlb (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_SW_TLB +:Architectures: ppc +:Type: vcpu ioctl +:Parameters: struct kvm_dirty_tlb (in) +:Returns: 0 on success, -1 on error -struct kvm_dirty_tlb { +:: + + struct kvm_dirty_tlb { __u64 bitmap; __u32 num_dirty; -}; + }; This must be called whenever userspace has changed an entry in the shared TLB, prior to calling KVM_RUN on the associated vcpu. @@ -1758,23 +1941,26 @@ be set to the number of set bits in the bitmap. 4.62 KVM_CREATE_SPAPR_TCE +------------------------- -Capability: KVM_CAP_SPAPR_TCE -Architectures: powerpc -Type: vm ioctl -Parameters: struct kvm_create_spapr_tce (in) -Returns: file descriptor for manipulating the created TCE table +:Capability: KVM_CAP_SPAPR_TCE +:Architectures: powerpc +:Type: vm ioctl +:Parameters: struct kvm_create_spapr_tce (in) +:Returns: file descriptor for manipulating the created TCE table This creates a virtual TCE (translation control entry) table, which is an IOMMU for PAPR-style virtual I/O. It is used to translate logical addresses used in virtual I/O into guest physical addresses, and provides a scatter/gather capability for PAPR virtual I/O. -/* for KVM_CAP_SPAPR_TCE */ -struct kvm_create_spapr_tce { +:: + + /* for KVM_CAP_SPAPR_TCE */ + struct kvm_create_spapr_tce { __u64 liobn; __u32 window_size; -}; + }; The liobn field gives the logical IO bus number for which to create a TCE table. The window_size field specifies the size of the DMA window @@ -1794,12 +1980,13 @@ circumstances. 4.63 KVM_ALLOCATE_RMA +--------------------- -Capability: KVM_CAP_PPC_RMA -Architectures: powerpc -Type: vm ioctl -Parameters: struct kvm_allocate_rma (out) -Returns: file descriptor for mapping the allocated RMA +:Capability: KVM_CAP_PPC_RMA +:Architectures: powerpc +:Type: vm ioctl +:Parameters: struct kvm_allocate_rma (out) +:Returns: file descriptor for mapping the allocated RMA This allocates a Real Mode Area (RMA) from the pool allocated at boot time by the kernel. An RMA is a physically-contiguous, aligned region @@ -1808,10 +1995,12 @@ will be accessed by real-mode (MMU off) accesses in a KVM guest. POWER processors support a set of sizes for the RMA that usually includes 64MB, 128MB, 256MB and some larger powers of two. -/* for KVM_ALLOCATE_RMA */ -struct kvm_allocate_rma { +:: + + /* for KVM_ALLOCATE_RMA */ + struct kvm_allocate_rma { __u64 rma_size; -}; + }; The return value is a file descriptor which can be passed to mmap(2) to map the allocated RMA into userspace. The mapped area can then be @@ -1827,12 +2016,13 @@ because it supports the Virtual RMA (VRMA) facility. 4.64 KVM_NMI +------------ -Capability: KVM_CAP_USER_NMI -Architectures: x86 -Type: vcpu ioctl -Parameters: none -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_USER_NMI +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: none +:Returns: 0 on success, -1 on error Queues an NMI on the thread's vcpu. Note this is well defined only when KVM_CREATE_IRQCHIP has not been called, since this is an interface @@ -1853,14 +2043,16 @@ debugging. 4.65 KVM_S390_UCAS_MAP +---------------------- -Capability: KVM_CAP_S390_UCONTROL -Architectures: s390 -Type: vcpu ioctl -Parameters: struct kvm_s390_ucas_mapping (in) -Returns: 0 in case of success +:Capability: KVM_CAP_S390_UCONTROL +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: struct kvm_s390_ucas_mapping (in) +:Returns: 0 in case of success + +The parameter is defined like this:: -The parameter is defined like this: struct kvm_s390_ucas_mapping { __u64 user_addr; __u64 vcpu_addr; @@ -1873,14 +2065,16 @@ be aligned by 1 megabyte. 4.66 KVM_S390_UCAS_UNMAP +------------------------ -Capability: KVM_CAP_S390_UCONTROL -Architectures: s390 -Type: vcpu ioctl -Parameters: struct kvm_s390_ucas_mapping (in) -Returns: 0 in case of success +:Capability: KVM_CAP_S390_UCONTROL +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: struct kvm_s390_ucas_mapping (in) +:Returns: 0 in case of success + +The parameter is defined like this:: -The parameter is defined like this: struct kvm_s390_ucas_mapping { __u64 user_addr; __u64 vcpu_addr; @@ -1893,12 +2087,13 @@ All parameters need to be aligned by 1 megabyte. 4.67 KVM_S390_VCPU_FAULT +------------------------ -Capability: KVM_CAP_S390_UCONTROL -Architectures: s390 -Type: vcpu ioctl -Parameters: vcpu absolute address (in) -Returns: 0 in case of success +:Capability: KVM_CAP_S390_UCONTROL +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: vcpu absolute address (in) +:Returns: 0 in case of success This call creates a page table entry on the virtual cpu's address space (for user controlled virtual machines) or the virtual machine's address @@ -1910,23 +2105,31 @@ prior to calling the KVM_RUN ioctl. 4.68 KVM_SET_ONE_REG +-------------------- + +:Capability: KVM_CAP_ONE_REG +:Architectures: all +:Type: vcpu ioctl +:Parameters: struct kvm_one_reg (in) +:Returns: 0 on success, negative value on failure -Capability: KVM_CAP_ONE_REG -Architectures: all -Type: vcpu ioctl -Parameters: struct kvm_one_reg (in) -Returns: 0 on success, negative value on failure Errors: -  ENOENT:   no such register -  EINVAL:   invalid register ID, or no such register -  EPERM:    (arm64) register access not allowed before vcpu finalization + + ====== ============================================================ +  ENOENT   no such register +  EINVAL   invalid register ID, or no such register +  EPERM    (arm64) register access not allowed before vcpu finalization + ====== ============================================================ + (These error codes are indicative only: do not rely on a specific error code being returned in a specific situation.) -struct kvm_one_reg { +:: + + struct kvm_one_reg { __u64 id; __u64 addr; -}; + }; Using this ioctl, a single vcpu register can be set to a specific value defined by user space with the passed in struct kvm_one_reg, where id @@ -1936,217 +2139,226 @@ and architecture specific registers. Each have their own range of operation and their own constants and width. To keep track of the implemented registers, find a list below: - Arch | Register | Width (bits) - | | - PPC | KVM_REG_PPC_HIOR | 64 - PPC | KVM_REG_PPC_IAC1 | 64 - PPC | KVM_REG_PPC_IAC2 | 64 - PPC | KVM_REG_PPC_IAC3 | 64 - PPC | KVM_REG_PPC_IAC4 | 64 - PPC | KVM_REG_PPC_DAC1 | 64 - PPC | KVM_REG_PPC_DAC2 | 64 - PPC | KVM_REG_PPC_DABR | 64 - PPC | KVM_REG_PPC_DSCR | 64 - PPC | KVM_REG_PPC_PURR | 64 - PPC | KVM_REG_PPC_SPURR | 64 - PPC | KVM_REG_PPC_DAR | 64 - PPC | KVM_REG_PPC_DSISR | 32 - PPC | KVM_REG_PPC_AMR | 64 - PPC | KVM_REG_PPC_UAMOR | 64 - PPC | KVM_REG_PPC_MMCR0 | 64 - PPC | KVM_REG_PPC_MMCR1 | 64 - PPC | KVM_REG_PPC_MMCRA | 64 - PPC | KVM_REG_PPC_MMCR2 | 64 - PPC | KVM_REG_PPC_MMCRS | 64 - PPC | KVM_REG_PPC_SIAR | 64 - PPC | KVM_REG_PPC_SDAR | 64 - PPC | KVM_REG_PPC_SIER | 64 - PPC | KVM_REG_PPC_PMC1 | 32 - PPC | KVM_REG_PPC_PMC2 | 32 - PPC | KVM_REG_PPC_PMC3 | 32 - PPC | KVM_REG_PPC_PMC4 | 32 - PPC | KVM_REG_PPC_PMC5 | 32 - PPC | KVM_REG_PPC_PMC6 | 32 - PPC | KVM_REG_PPC_PMC7 | 32 - PPC | KVM_REG_PPC_PMC8 | 32 - PPC | KVM_REG_PPC_FPR0 | 64 - ... - PPC | KVM_REG_PPC_FPR31 | 64 - PPC | KVM_REG_PPC_VR0 | 128 - ... - PPC | KVM_REG_PPC_VR31 | 128 - PPC | KVM_REG_PPC_VSR0 | 128 - ... - PPC | KVM_REG_PPC_VSR31 | 128 - PPC | KVM_REG_PPC_FPSCR | 64 - PPC | KVM_REG_PPC_VSCR | 32 - PPC | KVM_REG_PPC_VPA_ADDR | 64 - PPC | KVM_REG_PPC_VPA_SLB | 128 - PPC | KVM_REG_PPC_VPA_DTL | 128 - PPC | KVM_REG_PPC_EPCR | 32 - PPC | KVM_REG_PPC_EPR | 32 - PPC | KVM_REG_PPC_TCR | 32 - PPC | KVM_REG_PPC_TSR | 32 - PPC | KVM_REG_PPC_OR_TSR | 32 - PPC | KVM_REG_PPC_CLEAR_TSR | 32 - PPC | KVM_REG_PPC_MAS0 | 32 - PPC | KVM_REG_PPC_MAS1 | 32 - PPC | KVM_REG_PPC_MAS2 | 64 - PPC | KVM_REG_PPC_MAS7_3 | 64 - PPC | KVM_REG_PPC_MAS4 | 32 - PPC | KVM_REG_PPC_MAS6 | 32 - PPC | KVM_REG_PPC_MMUCFG | 32 - PPC | KVM_REG_PPC_TLB0CFG | 32 - PPC | KVM_REG_PPC_TLB1CFG | 32 - PPC | KVM_REG_PPC_TLB2CFG | 32 - PPC | KVM_REG_PPC_TLB3CFG | 32 - PPC | KVM_REG_PPC_TLB0PS | 32 - PPC | KVM_REG_PPC_TLB1PS | 32 - PPC | KVM_REG_PPC_TLB2PS | 32 - PPC | KVM_REG_PPC_TLB3PS | 32 - PPC | KVM_REG_PPC_EPTCFG | 32 - PPC | KVM_REG_PPC_ICP_STATE | 64 - PPC | KVM_REG_PPC_VP_STATE | 128 - PPC | KVM_REG_PPC_TB_OFFSET | 64 - PPC | KVM_REG_PPC_SPMC1 | 32 - PPC | KVM_REG_PPC_SPMC2 | 32 - PPC | KVM_REG_PPC_IAMR | 64 - PPC | KVM_REG_PPC_TFHAR | 64 - PPC | KVM_REG_PPC_TFIAR | 64 - PPC | KVM_REG_PPC_TEXASR | 64 - PPC | KVM_REG_PPC_FSCR | 64 - PPC | KVM_REG_PPC_PSPB | 32 - PPC | KVM_REG_PPC_EBBHR | 64 - PPC | KVM_REG_PPC_EBBRR | 64 - PPC | KVM_REG_PPC_BESCR | 64 - PPC | KVM_REG_PPC_TAR | 64 - PPC | KVM_REG_PPC_DPDES | 64 - PPC | KVM_REG_PPC_DAWR | 64 - PPC | KVM_REG_PPC_DAWRX | 64 - PPC | KVM_REG_PPC_CIABR | 64 - PPC | KVM_REG_PPC_IC | 64 - PPC | KVM_REG_PPC_VTB | 64 - PPC | KVM_REG_PPC_CSIGR | 64 - PPC | KVM_REG_PPC_TACR | 64 - PPC | KVM_REG_PPC_TCSCR | 64 - PPC | KVM_REG_PPC_PID | 64 - PPC | KVM_REG_PPC_ACOP | 64 - PPC | KVM_REG_PPC_VRSAVE | 32 - PPC | KVM_REG_PPC_LPCR | 32 - PPC | KVM_REG_PPC_LPCR_64 | 64 - PPC | KVM_REG_PPC_PPR | 64 - PPC | KVM_REG_PPC_ARCH_COMPAT | 32 - PPC | KVM_REG_PPC_DABRX | 32 - PPC | KVM_REG_PPC_WORT | 64 - PPC | KVM_REG_PPC_SPRG9 | 64 - PPC | KVM_REG_PPC_DBSR | 32 - PPC | KVM_REG_PPC_TIDR | 64 - PPC | KVM_REG_PPC_PSSCR | 64 - PPC | KVM_REG_PPC_DEC_EXPIRY | 64 - PPC | KVM_REG_PPC_PTCR | 64 - PPC | KVM_REG_PPC_TM_GPR0 | 64 - ... - PPC | KVM_REG_PPC_TM_GPR31 | 64 - PPC | KVM_REG_PPC_TM_VSR0 | 128 - ... - PPC | KVM_REG_PPC_TM_VSR63 | 128 - PPC | KVM_REG_PPC_TM_CR | 64 - PPC | KVM_REG_PPC_TM_LR | 64 - PPC | KVM_REG_PPC_TM_CTR | 64 - PPC | KVM_REG_PPC_TM_FPSCR | 64 - PPC | KVM_REG_PPC_TM_AMR | 64 - PPC | KVM_REG_PPC_TM_PPR | 64 - PPC | KVM_REG_PPC_TM_VRSAVE | 64 - PPC | KVM_REG_PPC_TM_VSCR | 32 - PPC | KVM_REG_PPC_TM_DSCR | 64 - PPC | KVM_REG_PPC_TM_TAR | 64 - PPC | KVM_REG_PPC_TM_XER | 64 - | | - MIPS | KVM_REG_MIPS_R0 | 64 - ... - MIPS | KVM_REG_MIPS_R31 | 64 - MIPS | KVM_REG_MIPS_HI | 64 - MIPS | KVM_REG_MIPS_LO | 64 - MIPS | KVM_REG_MIPS_PC | 64 - MIPS | KVM_REG_MIPS_CP0_INDEX | 32 - MIPS | KVM_REG_MIPS_CP0_ENTRYLO0 | 64 - MIPS | KVM_REG_MIPS_CP0_ENTRYLO1 | 64 - MIPS | KVM_REG_MIPS_CP0_CONTEXT | 64 - MIPS | KVM_REG_MIPS_CP0_CONTEXTCONFIG| 32 - MIPS | KVM_REG_MIPS_CP0_USERLOCAL | 64 - MIPS | KVM_REG_MIPS_CP0_XCONTEXTCONFIG| 64 - MIPS | KVM_REG_MIPS_CP0_PAGEMASK | 32 - MIPS | KVM_REG_MIPS_CP0_PAGEGRAIN | 32 - MIPS | KVM_REG_MIPS_CP0_SEGCTL0 | 64 - MIPS | KVM_REG_MIPS_CP0_SEGCTL1 | 64 - MIPS | KVM_REG_MIPS_CP0_SEGCTL2 | 64 - MIPS | KVM_REG_MIPS_CP0_PWBASE | 64 - MIPS | KVM_REG_MIPS_CP0_PWFIELD | 64 - MIPS | KVM_REG_MIPS_CP0_PWSIZE | 64 - MIPS | KVM_REG_MIPS_CP0_WIRED | 32 - MIPS | KVM_REG_MIPS_CP0_PWCTL | 32 - MIPS | KVM_REG_MIPS_CP0_HWRENA | 32 - MIPS | KVM_REG_MIPS_CP0_BADVADDR | 64 - MIPS | KVM_REG_MIPS_CP0_BADINSTR | 32 - MIPS | KVM_REG_MIPS_CP0_BADINSTRP | 32 - MIPS | KVM_REG_MIPS_CP0_COUNT | 32 - MIPS | KVM_REG_MIPS_CP0_ENTRYHI | 64 - MIPS | KVM_REG_MIPS_CP0_COMPARE | 32 - MIPS | KVM_REG_MIPS_CP0_STATUS | 32 - MIPS | KVM_REG_MIPS_CP0_INTCTL | 32 - MIPS | KVM_REG_MIPS_CP0_CAUSE | 32 - MIPS | KVM_REG_MIPS_CP0_EPC | 64 - MIPS | KVM_REG_MIPS_CP0_PRID | 32 - MIPS | KVM_REG_MIPS_CP0_EBASE | 64 - MIPS | KVM_REG_MIPS_CP0_CONFIG | 32 - MIPS | KVM_REG_MIPS_CP0_CONFIG1 | 32 - MIPS | KVM_REG_MIPS_CP0_CONFIG2 | 32 - MIPS | KVM_REG_MIPS_CP0_CONFIG3 | 32 - MIPS | KVM_REG_MIPS_CP0_CONFIG4 | 32 - MIPS | KVM_REG_MIPS_CP0_CONFIG5 | 32 - MIPS | KVM_REG_MIPS_CP0_CONFIG7 | 32 - MIPS | KVM_REG_MIPS_CP0_XCONTEXT | 64 - MIPS | KVM_REG_MIPS_CP0_ERROREPC | 64 - MIPS | KVM_REG_MIPS_CP0_KSCRATCH1 | 64 - MIPS | KVM_REG_MIPS_CP0_KSCRATCH2 | 64 - MIPS | KVM_REG_MIPS_CP0_KSCRATCH3 | 64 - MIPS | KVM_REG_MIPS_CP0_KSCRATCH4 | 64 - MIPS | KVM_REG_MIPS_CP0_KSCRATCH5 | 64 - MIPS | KVM_REG_MIPS_CP0_KSCRATCH6 | 64 - MIPS | KVM_REG_MIPS_CP0_MAAR(0..63) | 64 - MIPS | KVM_REG_MIPS_COUNT_CTL | 64 - MIPS | KVM_REG_MIPS_COUNT_RESUME | 64 - MIPS | KVM_REG_MIPS_COUNT_HZ | 64 - MIPS | KVM_REG_MIPS_FPR_32(0..31) | 32 - MIPS | KVM_REG_MIPS_FPR_64(0..31) | 64 - MIPS | KVM_REG_MIPS_VEC_128(0..31) | 128 - MIPS | KVM_REG_MIPS_FCR_IR | 32 - MIPS | KVM_REG_MIPS_FCR_CSR | 32 - MIPS | KVM_REG_MIPS_MSA_IR | 32 - MIPS | KVM_REG_MIPS_MSA_CSR | 32 + ======= =============================== ============ + Arch Register Width (bits) + ======= =============================== ============ + PPC KVM_REG_PPC_HIOR 64 + PPC KVM_REG_PPC_IAC1 64 + PPC KVM_REG_PPC_IAC2 64 + PPC KVM_REG_PPC_IAC3 64 + PPC KVM_REG_PPC_IAC4 64 + PPC KVM_REG_PPC_DAC1 64 + PPC KVM_REG_PPC_DAC2 64 + PPC KVM_REG_PPC_DABR 64 + PPC KVM_REG_PPC_DSCR 64 + PPC KVM_REG_PPC_PURR 64 + PPC KVM_REG_PPC_SPURR 64 + PPC KVM_REG_PPC_DAR 64 + PPC KVM_REG_PPC_DSISR 32 + PPC KVM_REG_PPC_AMR 64 + PPC KVM_REG_PPC_UAMOR 64 + PPC KVM_REG_PPC_MMCR0 64 + PPC KVM_REG_PPC_MMCR1 64 + PPC KVM_REG_PPC_MMCRA 64 + PPC KVM_REG_PPC_MMCR2 64 + PPC KVM_REG_PPC_MMCRS 64 + PPC KVM_REG_PPC_SIAR 64 + PPC KVM_REG_PPC_SDAR 64 + PPC KVM_REG_PPC_SIER 64 + PPC KVM_REG_PPC_PMC1 32 + PPC KVM_REG_PPC_PMC2 32 + PPC KVM_REG_PPC_PMC3 32 + PPC KVM_REG_PPC_PMC4 32 + PPC KVM_REG_PPC_PMC5 32 + PPC KVM_REG_PPC_PMC6 32 + PPC KVM_REG_PPC_PMC7 32 + PPC KVM_REG_PPC_PMC8 32 + PPC KVM_REG_PPC_FPR0 64 + ... + PPC KVM_REG_PPC_FPR31 64 + PPC KVM_REG_PPC_VR0 128 + ... + PPC KVM_REG_PPC_VR31 128 + PPC KVM_REG_PPC_VSR0 128 + ... + PPC KVM_REG_PPC_VSR31 128 + PPC KVM_REG_PPC_FPSCR 64 + PPC KVM_REG_PPC_VSCR 32 + PPC KVM_REG_PPC_VPA_ADDR 64 + PPC KVM_REG_PPC_VPA_SLB 128 + PPC KVM_REG_PPC_VPA_DTL 128 + PPC KVM_REG_PPC_EPCR 32 + PPC KVM_REG_PPC_EPR 32 + PPC KVM_REG_PPC_TCR 32 + PPC KVM_REG_PPC_TSR 32 + PPC KVM_REG_PPC_OR_TSR 32 + PPC KVM_REG_PPC_CLEAR_TSR 32 + PPC KVM_REG_PPC_MAS0 32 + PPC KVM_REG_PPC_MAS1 32 + PPC KVM_REG_PPC_MAS2 64 + PPC KVM_REG_PPC_MAS7_3 64 + PPC KVM_REG_PPC_MAS4 32 + PPC KVM_REG_PPC_MAS6 32 + PPC KVM_REG_PPC_MMUCFG 32 + PPC KVM_REG_PPC_TLB0CFG 32 + PPC KVM_REG_PPC_TLB1CFG 32 + PPC KVM_REG_PPC_TLB2CFG 32 + PPC KVM_REG_PPC_TLB3CFG 32 + PPC KVM_REG_PPC_TLB0PS 32 + PPC KVM_REG_PPC_TLB1PS 32 + PPC KVM_REG_PPC_TLB2PS 32 + PPC KVM_REG_PPC_TLB3PS 32 + PPC KVM_REG_PPC_EPTCFG 32 + PPC KVM_REG_PPC_ICP_STATE 64 + PPC KVM_REG_PPC_VP_STATE 128 + PPC KVM_REG_PPC_TB_OFFSET 64 + PPC KVM_REG_PPC_SPMC1 32 + PPC KVM_REG_PPC_SPMC2 32 + PPC KVM_REG_PPC_IAMR 64 + PPC KVM_REG_PPC_TFHAR 64 + PPC KVM_REG_PPC_TFIAR 64 + PPC KVM_REG_PPC_TEXASR 64 + PPC KVM_REG_PPC_FSCR 64 + PPC KVM_REG_PPC_PSPB 32 + PPC KVM_REG_PPC_EBBHR 64 + PPC KVM_REG_PPC_EBBRR 64 + PPC KVM_REG_PPC_BESCR 64 + PPC KVM_REG_PPC_TAR 64 + PPC KVM_REG_PPC_DPDES 64 + PPC KVM_REG_PPC_DAWR 64 + PPC KVM_REG_PPC_DAWRX 64 + PPC KVM_REG_PPC_CIABR 64 + PPC KVM_REG_PPC_IC 64 + PPC KVM_REG_PPC_VTB 64 + PPC KVM_REG_PPC_CSIGR 64 + PPC KVM_REG_PPC_TACR 64 + PPC KVM_REG_PPC_TCSCR 64 + PPC KVM_REG_PPC_PID 64 + PPC KVM_REG_PPC_ACOP 64 + PPC KVM_REG_PPC_VRSAVE 32 + PPC KVM_REG_PPC_LPCR 32 + PPC KVM_REG_PPC_LPCR_64 64 + PPC KVM_REG_PPC_PPR 64 + PPC KVM_REG_PPC_ARCH_COMPAT 32 + PPC KVM_REG_PPC_DABRX 32 + PPC KVM_REG_PPC_WORT 64 + PPC KVM_REG_PPC_SPRG9 64 + PPC KVM_REG_PPC_DBSR 32 + PPC KVM_REG_PPC_TIDR 64 + PPC KVM_REG_PPC_PSSCR 64 + PPC KVM_REG_PPC_DEC_EXPIRY 64 + PPC KVM_REG_PPC_PTCR 64 + PPC KVM_REG_PPC_TM_GPR0 64 + ... + PPC KVM_REG_PPC_TM_GPR31 64 + PPC KVM_REG_PPC_TM_VSR0 128 + ... + PPC KVM_REG_PPC_TM_VSR63 128 + PPC KVM_REG_PPC_TM_CR 64 + PPC KVM_REG_PPC_TM_LR 64 + PPC KVM_REG_PPC_TM_CTR 64 + PPC KVM_REG_PPC_TM_FPSCR 64 + PPC KVM_REG_PPC_TM_AMR 64 + PPC KVM_REG_PPC_TM_PPR 64 + PPC KVM_REG_PPC_TM_VRSAVE 64 + PPC KVM_REG_PPC_TM_VSCR 32 + PPC KVM_REG_PPC_TM_DSCR 64 + PPC KVM_REG_PPC_TM_TAR 64 + PPC KVM_REG_PPC_TM_XER 64 + + MIPS KVM_REG_MIPS_R0 64 + ... + MIPS KVM_REG_MIPS_R31 64 + MIPS KVM_REG_MIPS_HI 64 + MIPS KVM_REG_MIPS_LO 64 + MIPS KVM_REG_MIPS_PC 64 + MIPS KVM_REG_MIPS_CP0_INDEX 32 + MIPS KVM_REG_MIPS_CP0_ENTRYLO0 64 + MIPS KVM_REG_MIPS_CP0_ENTRYLO1 64 + MIPS KVM_REG_MIPS_CP0_CONTEXT 64 + MIPS KVM_REG_MIPS_CP0_CONTEXTCONFIG 32 + MIPS KVM_REG_MIPS_CP0_USERLOCAL 64 + MIPS KVM_REG_MIPS_CP0_XCONTEXTCONFIG 64 + MIPS KVM_REG_MIPS_CP0_PAGEMASK 32 + MIPS KVM_REG_MIPS_CP0_PAGEGRAIN 32 + MIPS KVM_REG_MIPS_CP0_SEGCTL0 64 + MIPS KVM_REG_MIPS_CP0_SEGCTL1 64 + MIPS KVM_REG_MIPS_CP0_SEGCTL2 64 + MIPS KVM_REG_MIPS_CP0_PWBASE 64 + MIPS KVM_REG_MIPS_CP0_PWFIELD 64 + MIPS KVM_REG_MIPS_CP0_PWSIZE 64 + MIPS KVM_REG_MIPS_CP0_WIRED 32 + MIPS KVM_REG_MIPS_CP0_PWCTL 32 + MIPS KVM_REG_MIPS_CP0_HWRENA 32 + MIPS KVM_REG_MIPS_CP0_BADVADDR 64 + MIPS KVM_REG_MIPS_CP0_BADINSTR 32 + MIPS KVM_REG_MIPS_CP0_BADINSTRP 32 + MIPS KVM_REG_MIPS_CP0_COUNT 32 + MIPS KVM_REG_MIPS_CP0_ENTRYHI 64 + MIPS KVM_REG_MIPS_CP0_COMPARE 32 + MIPS KVM_REG_MIPS_CP0_STATUS 32 + MIPS KVM_REG_MIPS_CP0_INTCTL 32 + MIPS KVM_REG_MIPS_CP0_CAUSE 32 + MIPS KVM_REG_MIPS_CP0_EPC 64 + MIPS KVM_REG_MIPS_CP0_PRID 32 + MIPS KVM_REG_MIPS_CP0_EBASE 64 + MIPS KVM_REG_MIPS_CP0_CONFIG 32 + MIPS KVM_REG_MIPS_CP0_CONFIG1 32 + MIPS KVM_REG_MIPS_CP0_CONFIG2 32 + MIPS KVM_REG_MIPS_CP0_CONFIG3 32 + MIPS KVM_REG_MIPS_CP0_CONFIG4 32 + MIPS KVM_REG_MIPS_CP0_CONFIG5 32 + MIPS KVM_REG_MIPS_CP0_CONFIG7 32 + MIPS KVM_REG_MIPS_CP0_XCONTEXT 64 + MIPS KVM_REG_MIPS_CP0_ERROREPC 64 + MIPS KVM_REG_MIPS_CP0_KSCRATCH1 64 + MIPS KVM_REG_MIPS_CP0_KSCRATCH2 64 + MIPS KVM_REG_MIPS_CP0_KSCRATCH3 64 + MIPS KVM_REG_MIPS_CP0_KSCRATCH4 64 + MIPS KVM_REG_MIPS_CP0_KSCRATCH5 64 + MIPS KVM_REG_MIPS_CP0_KSCRATCH6 64 + MIPS KVM_REG_MIPS_CP0_MAAR(0..63) 64 + MIPS KVM_REG_MIPS_COUNT_CTL 64 + MIPS KVM_REG_MIPS_COUNT_RESUME 64 + MIPS KVM_REG_MIPS_COUNT_HZ 64 + MIPS KVM_REG_MIPS_FPR_32(0..31) 32 + MIPS KVM_REG_MIPS_FPR_64(0..31) 64 + MIPS KVM_REG_MIPS_VEC_128(0..31) 128 + MIPS KVM_REG_MIPS_FCR_IR 32 + MIPS KVM_REG_MIPS_FCR_CSR 32 + MIPS KVM_REG_MIPS_MSA_IR 32 + MIPS KVM_REG_MIPS_MSA_CSR 32 + ======= =============================== ============ ARM registers are mapped using the lower 32 bits. The upper 16 of that is the register group type, or coprocessor number: -ARM core registers have the following id bit patterns: +ARM core registers have the following id bit patterns:: + 0x4020 0000 0010 -ARM 32-bit CP15 registers have the following id bit patterns: +ARM 32-bit CP15 registers have the following id bit patterns:: + 0x4020 0000 000F -ARM 64-bit CP15 registers have the following id bit patterns: +ARM 64-bit CP15 registers have the following id bit patterns:: + 0x4030 0000 000F -ARM CCSIDR registers are demultiplexed by CSSELR value: +ARM CCSIDR registers are demultiplexed by CSSELR value:: + 0x4020 0000 0011 00 -ARM 32-bit VFP control registers have the following id bit patterns: +ARM 32-bit VFP control registers have the following id bit patterns:: + 0x4020 0000 0012 1 -ARM 64-bit FP registers have the following id bit patterns: +ARM 64-bit FP registers have the following id bit patterns:: + 0x4030 0000 0012 0 -ARM firmware pseudo-registers have the following bit pattern: +ARM firmware pseudo-registers have the following bit pattern:: + 0x4030 0000 0014 @@ -2156,15 +2368,18 @@ that is the register group type, or coprocessor number: arm64 core/FP-SIMD registers have the following id bit patterns. Note that the size of the access is variable, as the kvm_regs structure contains elements ranging from 32 to 128 bits. The index is a 32bit -value in the kvm_regs structure seen as a 32bit array. +value in the kvm_regs structure seen as a 32bit array:: + 0x60x0 0000 0010 Specifically: + +======================= ========= ===== ======================================= Encoding Register Bits kvm_regs member ----------------------------------------------------------------- +======================= ========= ===== ======================================= 0x6030 0000 0010 0000 X0 64 regs.regs[0] 0x6030 0000 0010 0002 X1 64 regs.regs[1] - ... + ... 0x6030 0000 0010 003c X30 64 regs.regs[30] 0x6030 0000 0010 003e SP 64 regs.sp 0x6030 0000 0010 0040 PC 64 regs.pc @@ -2176,27 +2391,31 @@ Specifically: 0x6030 0000 0010 004c SPSR_UND 64 spsr[KVM_SPSR_UND] 0x6030 0000 0010 004e SPSR_IRQ 64 spsr[KVM_SPSR_IRQ] 0x6060 0000 0010 0050 SPSR_FIQ 64 spsr[KVM_SPSR_FIQ] - 0x6040 0000 0010 0054 V0 128 fp_regs.vregs[0] (*) - 0x6040 0000 0010 0058 V1 128 fp_regs.vregs[1] (*) - ... - 0x6040 0000 0010 00d0 V31 128 fp_regs.vregs[31] (*) + 0x6040 0000 0010 0054 V0 128 fp_regs.vregs[0] [1]_ + 0x6040 0000 0010 0058 V1 128 fp_regs.vregs[1] [1]_ + ... + 0x6040 0000 0010 00d0 V31 128 fp_regs.vregs[31] [1]_ 0x6020 0000 0010 00d4 FPSR 32 fp_regs.fpsr 0x6020 0000 0010 00d5 FPCR 32 fp_regs.fpcr +======================= ========= ===== ======================================= -(*) These encodings are not accepted for SVE-enabled vcpus. See - KVM_ARM_VCPU_INIT. +.. [1] These encodings are not accepted for SVE-enabled vcpus. See + KVM_ARM_VCPU_INIT. - The equivalent register content can be accessed via bits [127:0] of - the corresponding SVE Zn registers instead for vcpus that have SVE - enabled (see below). + The equivalent register content can be accessed via bits [127:0] of + the corresponding SVE Zn registers instead for vcpus that have SVE + enabled (see below). + +arm64 CCSIDR registers are demultiplexed by CSSELR value:: -arm64 CCSIDR registers are demultiplexed by CSSELR value: 0x6020 0000 0011 00 -arm64 system registers have the following id bit patterns: +arm64 system registers have the following id bit patterns:: + 0x6030 0000 0013 -WARNING: +.. warning:: + Two system register IDs do not follow the specified pattern. These are KVM_REG_ARM_TIMER_CVAL and KVM_REG_ARM_TIMER_CNT, which map to system registers CNTV_CVAL_EL0 and CNTVCT_EL0 respectively. These @@ -2205,10 +2424,12 @@ WARNING: derived from the register encoding for CNTV_CVAL_EL0. As this is API, it must remain this way. -arm64 firmware pseudo-registers have the following bit pattern: +arm64 firmware pseudo-registers have the following bit pattern:: + 0x6030 0000 0014 -arm64 SVE registers have the following bit patterns: +arm64 SVE registers have the following bit patterns:: + 0x6080 0000 0015 00 Zn bits[2048*slice + 2047 : 2048*slice] 0x6050 0000 0015 04 Pn bits[256*slice + 255 : 256*slice] 0x6050 0000 0015 060 FFR bits[256*slice + 255 : 256*slice] @@ -2216,7 +2437,7 @@ arm64 SVE registers have the following bit patterns: Access to register IDs where 2048 * slice >= 128 * max_vq will fail with ENOENT. max_vq is the vcpu's maximum supported vector length in 128-bit -quadwords: see (**) below. +quadwords: see [2]_ below. These registers are only accessible on vcpus for which SVE is enabled. See KVM_ARM_VCPU_INIT for details. @@ -2231,21 +2452,21 @@ lengths supported by the vcpu to be discovered and configured by userspace. When transferred to or from user memory via KVM_GET_ONE_REG or KVM_SET_ONE_REG, the value of this register is of type __u64[KVM_ARM64_SVE_VLS_WORDS], and encodes the set of vector lengths as -follows: +follows:: -__u64 vector_lengths[KVM_ARM64_SVE_VLS_WORDS]; + __u64 vector_lengths[KVM_ARM64_SVE_VLS_WORDS]; -if (vq >= SVE_VQ_MIN && vq <= SVE_VQ_MAX && - ((vector_lengths[(vq - KVM_ARM64_SVE_VQ_MIN) / 64] >> + if (vq >= SVE_VQ_MIN && vq <= SVE_VQ_MAX && + ((vector_lengths[(vq - KVM_ARM64_SVE_VQ_MIN) / 64] >> ((vq - KVM_ARM64_SVE_VQ_MIN) % 64)) & 1)) /* Vector length vq * 16 bytes supported */ -else + else /* Vector length vq * 16 bytes not supported */ -(**) The maximum value vq for which the above condition is true is -max_vq. This is the maximum vector length available to the guest on -this vcpu, and determines which register slices are visible through -this ioctl interface. +.. [2] The maximum value vq for which the above condition is true is + max_vq. This is the maximum vector length available to the guest on + this vcpu, and determines which register slices are visible through + this ioctl interface. (See Documentation/arm64/sve.rst for an explanation of the "vq" nomenclature.) @@ -2270,11 +2491,13 @@ write this register will fail with EPERM. MIPS registers are mapped using the lower 32 bits. The upper 16 of that is the register group type: -MIPS core registers (see above) have the following id bit patterns: +MIPS core registers (see above) have the following id bit patterns:: + 0x7030 0000 0000 MIPS CP0 registers (see KVM_REG_MIPS_CP0_* above) have the following id bit -patterns depending on whether they're 32-bit or 64-bit registers: +patterns depending on whether they're 32-bit or 64-bit registers:: + 0x7020 0000 0001 00 (32-bit) 0x7030 0000 0001 00 (64-bit) @@ -2285,10 +2508,12 @@ with the RI and XI bits (if they exist) in bits 63 and 62 respectively, and the PFNX field starting at bit 30. MIPS MAARs (see KVM_REG_MIPS_CP0_MAAR(*) above) have the following id bit -patterns: +patterns:: + 0x7030 0000 0001 01 -MIPS KVM control registers (see above) have the following id bit patterns: +MIPS KVM control registers (see above) have the following id bit patterns:: + 0x7030 0000 0002 MIPS FPU registers (see KVM_REG_MIPS_FPR_{32,64}() above) have the following @@ -2297,31 +2522,40 @@ always accessed according to the current guest FPU mode (Status.FR and Config5.FRE), i.e. as the guest would see them, and they become unpredictable if the guest FPU mode is changed. MIPS SIMD Architecture (MSA) vector registers (see KVM_REG_MIPS_VEC_128() above) have similar patterns as they -overlap the FPU registers: +overlap the FPU registers:: + 0x7020 0000 0003 00 <0:3> (32-bit FPU registers) 0x7030 0000 0003 00 <0:3> (64-bit FPU registers) 0x7040 0000 0003 00 <0:3> (128-bit MSA vector registers) MIPS FPU control registers (see KVM_REG_MIPS_FCR_{IR,CSR} above) have the -following id bit patterns: +following id bit patterns:: + 0x7020 0000 0003 01 <0:3> MIPS MSA control registers (see KVM_REG_MIPS_MSA_{IR,CSR} above) have the -following id bit patterns: +following id bit patterns:: + 0x7020 0000 0003 02 <0:3> 4.69 KVM_GET_ONE_REG +-------------------- + +:Capability: KVM_CAP_ONE_REG +:Architectures: all +:Type: vcpu ioctl +:Parameters: struct kvm_one_reg (in and out) +:Returns: 0 on success, negative value on failure -Capability: KVM_CAP_ONE_REG -Architectures: all -Type: vcpu ioctl -Parameters: struct kvm_one_reg (in and out) -Returns: 0 on success, negative value on failure Errors include: -  ENOENT:   no such register -  EINVAL:   invalid register ID, or no such register -  EPERM:    (arm64) register access not allowed before vcpu finalization + + ======== ============================================================ +  ENOENT   no such register +  EINVAL   invalid register ID, or no such register +  EPERM    (arm64) register access not allowed before vcpu finalization + ======== ============================================================ + (These error codes are indicative only: do not rely on a specific error code being returned in a specific situation.) @@ -2335,12 +2569,13 @@ list in 4.68. 4.70 KVM_KVMCLOCK_CTRL +---------------------- -Capability: KVM_CAP_KVMCLOCK_CTRL -Architectures: Any that implement pvclocks (currently x86 only) -Type: vcpu ioctl -Parameters: None -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_KVMCLOCK_CTRL +:Architectures: Any that implement pvclocks (currently x86 only) +:Type: vcpu ioctl +:Parameters: None +:Returns: 0 on success, -1 on error This signals to the host kernel that the specified guest is being paused by userspace. The host will set a flag in the pvclock structure that is checked @@ -2356,26 +2591,30 @@ after pausing the vcpu, but before it is resumed. 4.71 KVM_SIGNAL_MSI +------------------- -Capability: KVM_CAP_SIGNAL_MSI -Architectures: x86 arm arm64 -Type: vm ioctl -Parameters: struct kvm_msi (in) -Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error +:Capability: KVM_CAP_SIGNAL_MSI +:Architectures: x86 arm arm64 +:Type: vm ioctl +:Parameters: struct kvm_msi (in) +:Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error Directly inject a MSI message. Only valid with in-kernel irqchip that handles MSI messages. -struct kvm_msi { +:: + + struct kvm_msi { __u32 address_lo; __u32 address_hi; __u32 data; __u32 flags; __u32 devid; __u8 pad[12]; -}; + }; -flags: KVM_MSI_VALID_DEVID: devid contains a valid value. The per-VM +flags: + KVM_MSI_VALID_DEVID: devid contains a valid value. The per-VM KVM_CAP_MSI_DEVID capability advertises the requirement to provide the device ID. If this capability is not available, userspace should never set the KVM_MSI_VALID_DEVID flag as the ioctl might fail. @@ -2391,30 +2630,31 @@ address_hi must be zero. 4.71 KVM_CREATE_PIT2 +-------------------- -Capability: KVM_CAP_PIT2 -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_pit_config (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_PIT2 +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_pit_config (in) +:Returns: 0 on success, -1 on error Creates an in-kernel device model for the i8254 PIT. This call is only valid after enabling in-kernel irqchip support via KVM_CREATE_IRQCHIP. The following -parameters have to be passed: +parameters have to be passed:: -struct kvm_pit_config { + struct kvm_pit_config { __u32 flags; __u32 pad[15]; -}; + }; -Valid flags are: +Valid flags are:: -#define KVM_PIT_SPEAKER_DUMMY 1 /* emulate speaker port stub */ + #define KVM_PIT_SPEAKER_DUMMY 1 /* emulate speaker port stub */ PIT timer interrupts may use a per-VM kernel thread for injection. If it -exists, this thread will have a name of the following pattern: +exists, this thread will have a name of the following pattern:: -kvm-pit/ + kvm-pit/ When running a guest with elevated priorities, the scheduling parameters of this thread may have to be adjusted accordingly. @@ -2423,37 +2663,39 @@ This IOCTL replaces the obsolete KVM_CREATE_PIT. 4.72 KVM_GET_PIT2 +----------------- -Capability: KVM_CAP_PIT_STATE2 -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_pit_state2 (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_PIT_STATE2 +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_pit_state2 (out) +:Returns: 0 on success, -1 on error Retrieves the state of the in-kernel PIT model. Only valid after -KVM_CREATE_PIT2. The state is returned in the following structure: +KVM_CREATE_PIT2. The state is returned in the following structure:: -struct kvm_pit_state2 { + struct kvm_pit_state2 { struct kvm_pit_channel_state channels[3]; __u32 flags; __u32 reserved[9]; -}; + }; -Valid flags are: +Valid flags are:: -/* disable PIT in HPET legacy mode */ -#define KVM_PIT_FLAGS_HPET_LEGACY 0x00000001 + /* disable PIT in HPET legacy mode */ + #define KVM_PIT_FLAGS_HPET_LEGACY 0x00000001 This IOCTL replaces the obsolete KVM_GET_PIT. 4.73 KVM_SET_PIT2 +----------------- -Capability: KVM_CAP_PIT_STATE2 -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_pit_state2 (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_PIT_STATE2 +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_pit_state2 (in) +:Returns: 0 on success, -1 on error Sets the state of the in-kernel PIT model. Only valid after KVM_CREATE_PIT2. See KVM_GET_PIT2 for details on struct kvm_pit_state2. @@ -2462,12 +2704,13 @@ This IOCTL replaces the obsolete KVM_SET_PIT. 4.74 KVM_PPC_GET_SMMU_INFO +-------------------------- -Capability: KVM_CAP_PPC_GET_SMMU_INFO -Architectures: powerpc -Type: vm ioctl -Parameters: None -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_PPC_GET_SMMU_INFO +:Architectures: powerpc +:Type: vm ioctl +:Parameters: None +:Returns: 0 on success, -1 on error This populates and returns a structure describing the features of the "Server" class MMU emulation supported by KVM. @@ -2475,7 +2718,7 @@ This can in turn be used by userspace to generate the appropriate device-tree properties for the guest operating system. The structure contains some global information, followed by an -array of supported segment page sizes: +array of supported segment page sizes:: struct kvm_ppc_smmu_info { __u64 flags; @@ -2503,7 +2746,7 @@ The "slb_size" field indicates how many SLB entries are supported The "sps" array contains 8 entries indicating the supported base page sizes for a segment in increasing order. Each entry is defined -as follow: +as follow:: struct kvm_ppc_one_seg_page_size { __u32 page_shift; /* Base page shift of segment (or 0) */ @@ -2524,7 +2767,7 @@ size provides the list of supported actual page sizes (which can be only larger or equal to the base page size), along with the corresponding encoding in the hash PTE. Similarly, the array is 8 entries sorted by increasing sizes and an entry with a "0" shift -is an empty entry and a terminator: +is an empty entry and a terminator:: struct kvm_ppc_one_page_size { __u32 page_shift; /* Page shift (or 0) */ @@ -2536,12 +2779,13 @@ PTE's RPN field (ie, it needs to be shifted left by 12 to OR it into the hash PTE second double word). 4.75 KVM_IRQFD +-------------- -Capability: KVM_CAP_IRQFD -Architectures: x86 s390 arm arm64 -Type: vm ioctl -Parameters: struct kvm_irqfd (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_IRQFD +:Architectures: x86 s390 arm arm64 +:Type: vm ioctl +:Parameters: struct kvm_irqfd (in) +:Returns: 0 on success, -1 on error Allows setting an eventfd to directly trigger a guest interrupt. kvm_irqfd.fd specifies the file descriptor to use as the eventfd and @@ -2565,6 +2809,7 @@ irqfd. The KVM_IRQFD_FLAG_RESAMPLE is only necessary on assignment and need not be specified with KVM_IRQFD_FLAG_DEASSIGN. On arm/arm64, gsi routing being supported, the following can happen: + - in case no routing entry is associated to this gsi, injection fails - in case the gsi is associated to an irqchip routing entry, irqchip.pin + 32 corresponds to the injected SPI ID. @@ -2573,12 +2818,13 @@ On arm/arm64, gsi routing being supported, the following can happen: to GICv3 ITS in-kernel emulation). 4.76 KVM_PPC_ALLOCATE_HTAB +-------------------------- -Capability: KVM_CAP_PPC_ALLOC_HTAB -Architectures: powerpc -Type: vm ioctl -Parameters: Pointer to u32 containing hash table order (in/out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_PPC_ALLOC_HTAB +:Architectures: powerpc +:Type: vm ioctl +:Parameters: Pointer to u32 containing hash table order (in/out) +:Returns: 0 on success, -1 on error This requests the host kernel to allocate an MMU hash table for a guest using the PAPR paravirtualization interface. This only does @@ -2609,75 +2855,88 @@ real-mode area (VRMA) facility, the kernel will re-create the VMRA HPTEs on the next KVM_RUN of any vcpu. 4.77 KVM_S390_INTERRUPT +----------------------- -Capability: basic -Architectures: s390 -Type: vm ioctl, vcpu ioctl -Parameters: struct kvm_s390_interrupt (in) -Returns: 0 on success, -1 on error +:Capability: basic +:Architectures: s390 +:Type: vm ioctl, vcpu ioctl +:Parameters: struct kvm_s390_interrupt (in) +:Returns: 0 on success, -1 on error Allows to inject an interrupt to the guest. Interrupts can be floating (vm ioctl) or per cpu (vcpu ioctl), depending on the interrupt type. -Interrupt parameters are passed via kvm_s390_interrupt: +Interrupt parameters are passed via kvm_s390_interrupt:: -struct kvm_s390_interrupt { + struct kvm_s390_interrupt { __u32 type; __u32 parm; __u64 parm64; -}; + }; type can be one of the following: -KVM_S390_SIGP_STOP (vcpu) - sigp stop; optional flags in parm -KVM_S390_PROGRAM_INT (vcpu) - program check; code in parm -KVM_S390_SIGP_SET_PREFIX (vcpu) - sigp set prefix; prefix address in parm -KVM_S390_RESTART (vcpu) - restart -KVM_S390_INT_CLOCK_COMP (vcpu) - clock comparator interrupt -KVM_S390_INT_CPU_TIMER (vcpu) - CPU timer interrupt -KVM_S390_INT_VIRTIO (vm) - virtio external interrupt; external interrupt - parameters in parm and parm64 -KVM_S390_INT_SERVICE (vm) - sclp external interrupt; sclp parameter in parm -KVM_S390_INT_EMERGENCY (vcpu) - sigp emergency; source cpu in parm -KVM_S390_INT_EXTERNAL_CALL (vcpu) - sigp external call; source cpu in parm -KVM_S390_INT_IO(ai,cssid,ssid,schid) (vm) - compound value to indicate an - I/O interrupt (ai - adapter interrupt; cssid,ssid,schid - subchannel); - I/O interruption parameters in parm (subchannel) and parm64 (intparm, - interruption subclass) -KVM_S390_MCHK (vm, vcpu) - machine check interrupt; cr 14 bits in parm, - machine check interrupt code in parm64 (note that - machine checks needing further payload are not - supported by this ioctl) +KVM_S390_SIGP_STOP (vcpu) + - sigp stop; optional flags in parm +KVM_S390_PROGRAM_INT (vcpu) + - program check; code in parm +KVM_S390_SIGP_SET_PREFIX (vcpu) + - sigp set prefix; prefix address in parm +KVM_S390_RESTART (vcpu) + - restart +KVM_S390_INT_CLOCK_COMP (vcpu) + - clock comparator interrupt +KVM_S390_INT_CPU_TIMER (vcpu) + - CPU timer interrupt +KVM_S390_INT_VIRTIO (vm) + - virtio external interrupt; external interrupt + parameters in parm and parm64 +KVM_S390_INT_SERVICE (vm) + - sclp external interrupt; sclp parameter in parm +KVM_S390_INT_EMERGENCY (vcpu) + - sigp emergency; source cpu in parm +KVM_S390_INT_EXTERNAL_CALL (vcpu) + - sigp external call; source cpu in parm +KVM_S390_INT_IO(ai,cssid,ssid,schid) (vm) + - compound value to indicate an + I/O interrupt (ai - adapter interrupt; cssid,ssid,schid - subchannel); + I/O interruption parameters in parm (subchannel) and parm64 (intparm, + interruption subclass) +KVM_S390_MCHK (vm, vcpu) + - machine check interrupt; cr 14 bits in parm, machine check interrupt + code in parm64 (note that machine checks needing further payload are not + supported by this ioctl) This is an asynchronous vcpu ioctl and can be invoked from any thread. 4.78 KVM_PPC_GET_HTAB_FD +------------------------ -Capability: KVM_CAP_PPC_HTAB_FD -Architectures: powerpc -Type: vm ioctl -Parameters: Pointer to struct kvm_get_htab_fd (in) -Returns: file descriptor number (>= 0) on success, -1 on error +:Capability: KVM_CAP_PPC_HTAB_FD +:Architectures: powerpc +:Type: vm ioctl +:Parameters: Pointer to struct kvm_get_htab_fd (in) +:Returns: file descriptor number (>= 0) on success, -1 on error This returns a file descriptor that can be used either to read out the entries in the guest's hashed page table (HPT), or to write entries to initialize the HPT. The returned fd can only be written to if the KVM_GET_HTAB_WRITE bit is set in the flags field of the argument, and can only be read if that bit is clear. The argument struct looks like -this: +this:: -/* For KVM_PPC_GET_HTAB_FD */ -struct kvm_get_htab_fd { + /* For KVM_PPC_GET_HTAB_FD */ + struct kvm_get_htab_fd { __u64 flags; __u64 start_index; __u64 reserved[2]; -}; + }; -/* Values for kvm_get_htab_fd.flags */ -#define KVM_GET_HTAB_BOLTED_ONLY ((__u64)0x1) -#define KVM_GET_HTAB_WRITE ((__u64)0x2) + /* Values for kvm_get_htab_fd.flags */ + #define KVM_GET_HTAB_BOLTED_ONLY ((__u64)0x1) + #define KVM_GET_HTAB_WRITE ((__u64)0x2) -The `start_index' field gives the index in the HPT of the entry at +The 'start_index' field gives the index in the HPT of the entry at which to start reading. It is ignored when writing. Reads on the fd will initially supply information about all @@ -2692,29 +2951,34 @@ Data read or written is structured as a header (8 bytes) followed by a series of valid HPT entries (16 bytes) each. The header indicates how many valid HPT entries there are and how many invalid entries follow the valid entries. The invalid entries are not represented explicitly -in the stream. The header format is: +in the stream. The header format is:: -struct kvm_get_htab_header { + struct kvm_get_htab_header { __u32 index; __u16 n_valid; __u16 n_invalid; -}; + }; Writes to the fd create HPT entries starting at the index given in the -header; first `n_valid' valid entries with contents from the data -written, then `n_invalid' invalid entries, invalidating any previously +header; first 'n_valid' valid entries with contents from the data +written, then 'n_invalid' invalid entries, invalidating any previously valid entries found. 4.79 KVM_CREATE_DEVICE +---------------------- + +:Capability: KVM_CAP_DEVICE_CTRL +:Type: vm ioctl +:Parameters: struct kvm_create_device (in/out) +:Returns: 0 on success, -1 on error -Capability: KVM_CAP_DEVICE_CTRL -Type: vm ioctl -Parameters: struct kvm_create_device (in/out) -Returns: 0 on success, -1 on error Errors: - ENODEV: The device type is unknown or unsupported - EEXIST: Device already created, and this type of device may not + + ====== ======================================================= + ENODEV The device type is unknown or unsupported + EEXIST Device already created, and this type of device may not be instantiated multiple times + ====== ======================================================= Other error conditions may be defined by individual device types or have their standard meanings. @@ -2730,25 +2994,32 @@ Individual devices should not define flags. Attributes should be used for specifying any behavior that is not implied by the device type number. -struct kvm_create_device { +:: + + struct kvm_create_device { __u32 type; /* in: KVM_DEV_TYPE_xxx */ __u32 fd; /* out: device handle */ __u32 flags; /* in: KVM_CREATE_DEVICE_xxx */ -}; + }; 4.80 KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR +-------------------------------------------- + +:Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, + KVM_CAP_VCPU_ATTRIBUTES for vcpu device +:Type: device ioctl, vm ioctl, vcpu ioctl +:Parameters: struct kvm_device_attr +:Returns: 0 on success, -1 on error -Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, - KVM_CAP_VCPU_ATTRIBUTES for vcpu device -Type: device ioctl, vm ioctl, vcpu ioctl -Parameters: struct kvm_device_attr -Returns: 0 on success, -1 on error Errors: - ENXIO: The group or attribute is unknown/unsupported for this device + + ===== ============================================================= + ENXIO The group or attribute is unknown/unsupported for this device or hardware support is missing. - EPERM: The attribute cannot (currently) be accessed this way + EPERM The attribute cannot (currently) be accessed this way (e.g. read-only attribute, or attribute that only makes sense when the device is in a different state) + ===== ============================================================= Other error conditions may be defined by individual device types. @@ -2757,23 +3028,30 @@ semantics are device-specific. See individual device documentation in the "devices" directory. As with ONE_REG, the size of the data transferred is defined by the particular attribute. -struct kvm_device_attr { +:: + + struct kvm_device_attr { __u32 flags; /* no flags currently defined */ __u32 group; /* device-defined */ __u64 attr; /* group-defined */ __u64 addr; /* userspace address of attr data */ -}; + }; 4.81 KVM_HAS_DEVICE_ATTR +------------------------ + +:Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, + KVM_CAP_VCPU_ATTRIBUTES for vcpu device +:Type: device ioctl, vm ioctl, vcpu ioctl +:Parameters: struct kvm_device_attr +:Returns: 0 on success, -1 on error -Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, - KVM_CAP_VCPU_ATTRIBUTES for vcpu device -Type: device ioctl, vm ioctl, vcpu ioctl -Parameters: struct kvm_device_attr -Returns: 0 on success, -1 on error Errors: - ENXIO: The group or attribute is unknown/unsupported for this device + + ===== ============================================================= + ENXIO The group or attribute is unknown/unsupported for this device or hardware support is missing. + ===== ============================================================= Tests whether a device supports a particular attribute. A successful return indicates the attribute is implemented. It does not necessarily @@ -2781,15 +3059,20 @@ indicate that the attribute can be read or written in the device's current state. "addr" is ignored. 4.82 KVM_ARM_VCPU_INIT +---------------------- + +:Capability: basic +:Architectures: arm, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_vcpu_init (in) +:Returns: 0 on success; -1 on error -Capability: basic -Architectures: arm, arm64 -Type: vcpu ioctl -Parameters: struct kvm_vcpu_init (in) -Returns: 0 on success; -1 on error Errors: -  EINVAL:    the target is unknown, or the combination of features is invalid. -  ENOENT:    a features bit specified is unknown. + + ====== ================================================================= +  EINVAL    the target is unknown, or the combination of features is invalid. +  ENOENT    a features bit specified is unknown. + ====== ================================================================= This tells KVM what type of CPU to present to the guest, and what optional features it should have.  This will cause a reset of the cpu @@ -2805,6 +3088,7 @@ state. All calls to this function after the initial call must use the same target and same set of feature flags, otherwise EINVAL will be returned. Possible features: + - KVM_ARM_VCPU_POWER_OFF: Starts the CPU in a power-off state. Depends on KVM_CAP_ARM_PSCI. If not set, the CPU will be powered on and execute guest code when KVM_RUN is called. @@ -2861,14 +3145,19 @@ Possible features: no longer be written using KVM_SET_ONE_REG. 4.83 KVM_ARM_PREFERRED_TARGET +----------------------------- + +:Capability: basic +:Architectures: arm, arm64 +:Type: vm ioctl +:Parameters: struct struct kvm_vcpu_init (out) +:Returns: 0 on success; -1 on error -Capability: basic -Architectures: arm, arm64 -Type: vm ioctl -Parameters: struct struct kvm_vcpu_init (out) -Returns: 0 on success; -1 on error Errors: - ENODEV: no preferred target available for the host + + ====== ========================================== + ENODEV no preferred target available for the host + ====== ========================================== This queries KVM for preferred CPU target type which can be emulated by KVM on underlying host. @@ -2885,43 +3174,57 @@ in VCPU matching underlying host. 4.84 KVM_GET_REG_LIST +--------------------- + +:Capability: basic +:Architectures: arm, arm64, mips +:Type: vcpu ioctl +:Parameters: struct kvm_reg_list (in/out) +:Returns: 0 on success; -1 on error -Capability: basic -Architectures: arm, arm64, mips -Type: vcpu ioctl -Parameters: struct kvm_reg_list (in/out) -Returns: 0 on success; -1 on error Errors: -  E2BIG:     the reg index list is too big to fit in the array specified by + + ===== ============================================================== +  E2BIG     the reg index list is too big to fit in the array specified by             the user (the number required will be written into n). + ===== ============================================================== -struct kvm_reg_list { +:: + + struct kvm_reg_list { __u64 n; /* number of registers in reg[] */ __u64 reg[0]; -}; + }; This ioctl returns the guest registers that are supported for the KVM_GET_ONE_REG/KVM_SET_ONE_REG calls. 4.85 KVM_ARM_SET_DEVICE_ADDR (deprecated) +----------------------------------------- + +:Capability: KVM_CAP_ARM_SET_DEVICE_ADDR +:Architectures: arm, arm64 +:Type: vm ioctl +:Parameters: struct kvm_arm_device_address (in) +:Returns: 0 on success, -1 on error -Capability: KVM_CAP_ARM_SET_DEVICE_ADDR -Architectures: arm, arm64 -Type: vm ioctl -Parameters: struct kvm_arm_device_address (in) -Returns: 0 on success, -1 on error Errors: - ENODEV: The device id is unknown - ENXIO: Device not supported on current system - EEXIST: Address already set - E2BIG: Address outside guest physical address space - EBUSY: Address overlaps with other device range -struct kvm_arm_device_addr { + ====== ============================================ + ENODEV The device id is unknown + ENXIO Device not supported on current system + EEXIST Address already set + E2BIG Address outside guest physical address space + EBUSY Address overlaps with other device range + ====== ============================================ + +:: + + struct kvm_arm_device_addr { __u64 id; __u64 addr; -}; + }; Specify a device address in the guest's physical address space where guests can access emulated or directly exposed devices, which the host kernel needs @@ -2929,7 +3232,7 @@ to know about. The id field is an architecture specific identifier for a specific device. ARM/arm64 divides the id field into two parts, a device id and an -address type id specific to the individual device. +address type id specific to the individual device::  bits: | 63 ... 32 | 31 ... 16 | 15 ... 0 | field: | 0x00000000 | device id | addr type id | @@ -2947,12 +3250,13 @@ should be used instead. 4.86 KVM_PPC_RTAS_DEFINE_TOKEN +------------------------------ -Capability: KVM_CAP_PPC_RTAS -Architectures: ppc -Type: vm ioctl -Parameters: struct kvm_rtas_token_args -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_PPC_RTAS +:Architectures: ppc +:Type: vm ioctl +:Parameters: struct kvm_rtas_token_args +:Returns: 0 on success, -1 on error Defines a token value for a RTAS (Run Time Abstraction Services) service in order to allow it to be handled in the kernel. The @@ -2966,18 +3270,21 @@ calls by the guest for that service will be passed to userspace to be handled. 4.87 KVM_SET_GUEST_DEBUG +------------------------ -Capability: KVM_CAP_SET_GUEST_DEBUG -Architectures: x86, s390, ppc, arm64 -Type: vcpu ioctl -Parameters: struct kvm_guest_debug (in) -Returns: 0 on success; -1 on error +:Capability: KVM_CAP_SET_GUEST_DEBUG +:Architectures: x86, s390, ppc, arm64 +:Type: vcpu ioctl +:Parameters: struct kvm_guest_debug (in) +:Returns: 0 on success; -1 on error -struct kvm_guest_debug { +:: + + struct kvm_guest_debug { __u32 control; __u32 pad; struct kvm_guest_debug_arch arch; -}; + }; Set up the processor specific debug registers and configure vcpu for handling guest debug events. There are two parts to the structure, the @@ -3019,26 +3326,31 @@ KVM_EXIT_DEBUG with the kvm_debug_exit_arch part of the kvm_run structure containing architecture specific debug information. 4.88 KVM_GET_EMULATED_CPUID +--------------------------- -Capability: KVM_CAP_EXT_EMUL_CPUID -Architectures: x86 -Type: system ioctl -Parameters: struct kvm_cpuid2 (in/out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_EXT_EMUL_CPUID +:Architectures: x86 +:Type: system ioctl +:Parameters: struct kvm_cpuid2 (in/out) +:Returns: 0 on success, -1 on error -struct kvm_cpuid2 { +:: + + struct kvm_cpuid2 { __u32 nent; __u32 flags; struct kvm_cpuid_entry2 entries[0]; -}; + }; The member 'flags' is used for passing flags from userspace. -#define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) -#define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) -#define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) +:: -struct kvm_cpuid_entry2 { + #define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) + #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) + #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) + + struct kvm_cpuid_entry2 { __u32 function; __u32 index; __u32 flags; @@ -3047,7 +3359,7 @@ struct kvm_cpuid_entry2 { __u32 ecx; __u32 edx; __u32 padding[3]; -}; + }; This ioctl returns x86 cpuid features which are emulated by kvm.Userspace can use the information returned by this ioctl to query @@ -3072,10 +3384,14 @@ emulated efficiently and thus not included here. The fields in each entry are defined as follows: - function: the eax value used to obtain the entry - index: the ecx value used to obtain the entry (for entries that are + function: + the eax value used to obtain the entry + index: + the ecx value used to obtain the entry (for entries that are affected by ecx) - flags: an OR of zero or more of the following: + flags: + an OR of zero or more of the following: + KVM_CPUID_FLAG_SIGNIFCANT_INDEX: if the index field is valid KVM_CPUID_FLAG_STATEFUL_FUNC: @@ -3085,24 +3401,28 @@ The fields in each entry are defined as follows: KVM_CPUID_FLAG_STATE_READ_NEXT: for KVM_CPUID_FLAG_STATEFUL_FUNC entries, set if this entry is the first entry to be read by a cpu - eax, ebx, ecx, edx: the values returned by the cpuid instruction for + + eax, ebx, ecx, edx: + + the values returned by the cpuid instruction for this function/index combination 4.89 KVM_S390_MEM_OP +-------------------- -Capability: KVM_CAP_S390_MEM_OP -Architectures: s390 -Type: vcpu ioctl -Parameters: struct kvm_s390_mem_op (in) -Returns: = 0 on success, - < 0 on generic error (e.g. -EFAULT or -ENOMEM), - > 0 if an exception occurred while walking the page tables +:Capability: KVM_CAP_S390_MEM_OP +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: struct kvm_s390_mem_op (in) +:Returns: = 0 on success, + < 0 on generic error (e.g. -EFAULT or -ENOMEM), + > 0 if an exception occurred while walking the page tables Read or write data from/to the logical (virtual) memory of a VCPU. -Parameters are specified via the following structure: +Parameters are specified via the following structure:: -struct kvm_s390_mem_op { + struct kvm_s390_mem_op { __u64 gaddr; /* the guest address */ __u64 flags; /* flags */ __u32 size; /* amount of bytes */ @@ -3110,7 +3430,7 @@ struct kvm_s390_mem_op { __u64 buf; /* buffer in userspace */ __u8 ar; /* the access register number */ __u8 reserved[31]; /* should be set to 0 */ -}; + }; The type of operation is specified in the "op" field. It is either KVM_S390_MEMOP_LOGICAL_READ for reading from logical memory space or @@ -3137,24 +3457,25 @@ The "reserved" field is meant for future extensions. It is not used by KVM with the currently defined set of flags. 4.90 KVM_S390_GET_SKEYS +----------------------- -Capability: KVM_CAP_S390_SKEYS -Architectures: s390 -Type: vm ioctl -Parameters: struct kvm_s390_skeys -Returns: 0 on success, KVM_S390_GET_KEYS_NONE if guest is not using storage - keys, negative value on error +:Capability: KVM_CAP_S390_SKEYS +:Architectures: s390 +:Type: vm ioctl +:Parameters: struct kvm_s390_skeys +:Returns: 0 on success, KVM_S390_GET_KEYS_NONE if guest is not using storage + keys, negative value on error This ioctl is used to get guest storage key values on the s390 -architecture. The ioctl takes parameters via the kvm_s390_skeys struct. +architecture. The ioctl takes parameters via the kvm_s390_skeys struct:: -struct kvm_s390_skeys { + struct kvm_s390_skeys { __u64 start_gfn; __u64 count; __u64 skeydata_addr; __u32 flags; __u32 reserved[9]; -}; + }; The start_gfn field is the number of the first guest frame whose storage keys you want to get. @@ -3168,12 +3489,13 @@ The skeydata_addr field is the address to a buffer large enough to hold count bytes. This buffer will be filled with storage key data by the ioctl. 4.91 KVM_S390_SET_SKEYS +----------------------- -Capability: KVM_CAP_S390_SKEYS -Architectures: s390 -Type: vm ioctl -Parameters: struct kvm_s390_skeys -Returns: 0 on success, negative value on error +:Capability: KVM_CAP_S390_SKEYS +:Architectures: s390 +:Type: vm ioctl +:Parameters: struct kvm_s390_skeys +:Returns: 0 on success, negative value on error This ioctl is used to set guest storage key values on the s390 architecture. The ioctl takes parameters via the kvm_s390_skeys struct. @@ -3195,21 +3517,27 @@ Note: If any architecturally invalid key value is found in the given data then the ioctl will return -EINVAL. 4.92 KVM_S390_IRQ +----------------- + +:Capability: KVM_CAP_S390_INJECT_IRQ +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: struct kvm_s390_irq (in) +:Returns: 0 on success, -1 on error -Capability: KVM_CAP_S390_INJECT_IRQ -Architectures: s390 -Type: vcpu ioctl -Parameters: struct kvm_s390_irq (in) -Returns: 0 on success, -1 on error Errors: - EINVAL: interrupt type is invalid - type is KVM_S390_SIGP_STOP and flag parameter is invalid value + + + ====== ================================================================= + EINVAL interrupt type is invalid + type is KVM_S390_SIGP_STOP and flag parameter is invalid value, type is KVM_S390_INT_EXTERNAL_CALL and code is bigger - than the maximum of VCPUs - EBUSY: type is KVM_S390_SIGP_SET_PREFIX and vcpu is not stopped - type is KVM_S390_SIGP_STOP and a stop irq is already pending + than the maximum of VCPUs + EBUSY type is KVM_S390_SIGP_SET_PREFIX and vcpu is not stopped, + type is KVM_S390_SIGP_STOP and a stop irq is already pending, type is KVM_S390_INT_EXTERNAL_CALL and an external call interrupt - is already pending + is already pending + ====== ================================================================= Allows to inject an interrupt to the guest. @@ -3217,9 +3545,9 @@ Using struct kvm_s390_irq as a parameter allows to inject additional payload which is not possible via KVM_S390_INTERRUPT. -Interrupt parameters are passed via kvm_s390_irq: +Interrupt parameters are passed via kvm_s390_irq:: -struct kvm_s390_irq { + struct kvm_s390_irq { __u64 type; union { struct kvm_s390_io_info io; @@ -3232,44 +3560,45 @@ struct kvm_s390_irq { struct kvm_s390_mchk_info mchk; char reserved[64]; } u; -}; + }; type can be one of the following: -KVM_S390_SIGP_STOP - sigp stop; parameter in .stop -KVM_S390_PROGRAM_INT - program check; parameters in .pgm -KVM_S390_SIGP_SET_PREFIX - sigp set prefix; parameters in .prefix -KVM_S390_RESTART - restart; no parameters -KVM_S390_INT_CLOCK_COMP - clock comparator interrupt; no parameters -KVM_S390_INT_CPU_TIMER - CPU timer interrupt; no parameters -KVM_S390_INT_EMERGENCY - sigp emergency; parameters in .emerg -KVM_S390_INT_EXTERNAL_CALL - sigp external call; parameters in .extcall -KVM_S390_MCHK - machine check interrupt; parameters in .mchk +- KVM_S390_SIGP_STOP - sigp stop; parameter in .stop +- KVM_S390_PROGRAM_INT - program check; parameters in .pgm +- KVM_S390_SIGP_SET_PREFIX - sigp set prefix; parameters in .prefix +- KVM_S390_RESTART - restart; no parameters +- KVM_S390_INT_CLOCK_COMP - clock comparator interrupt; no parameters +- KVM_S390_INT_CPU_TIMER - CPU timer interrupt; no parameters +- KVM_S390_INT_EMERGENCY - sigp emergency; parameters in .emerg +- KVM_S390_INT_EXTERNAL_CALL - sigp external call; parameters in .extcall +- KVM_S390_MCHK - machine check interrupt; parameters in .mchk This is an asynchronous vcpu ioctl and can be invoked from any thread. 4.94 KVM_S390_GET_IRQ_STATE +--------------------------- -Capability: KVM_CAP_S390_IRQ_STATE -Architectures: s390 -Type: vcpu ioctl -Parameters: struct kvm_s390_irq_state (out) -Returns: >= number of bytes copied into buffer, - -EINVAL if buffer size is 0, - -ENOBUFS if buffer size is too small to fit all pending interrupts, - -EFAULT if the buffer address was invalid +:Capability: KVM_CAP_S390_IRQ_STATE +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: struct kvm_s390_irq_state (out) +:Returns: >= number of bytes copied into buffer, + -EINVAL if buffer size is 0, + -ENOBUFS if buffer size is too small to fit all pending interrupts, + -EFAULT if the buffer address was invalid This ioctl allows userspace to retrieve the complete state of all currently pending interrupts in a single buffer. Use cases include migration and introspection. The parameter structure contains the address of a -userspace buffer and its length: +userspace buffer and its length:: -struct kvm_s390_irq_state { + struct kvm_s390_irq_state { __u64 buf; __u32 flags; /* will stay unused for compatibility reasons */ __u32 len; __u32 reserved[4]; /* will stay unused for compatibility reasons */ -}; + }; Userspace passes in the above struct and for each pending interrupt a struct kvm_s390_irq is copied to the provided buffer. @@ -3283,29 +3612,30 @@ If -ENOBUFS is returned the buffer provided was too small and userspace may retry with a bigger buffer. 4.95 KVM_S390_SET_IRQ_STATE +--------------------------- -Capability: KVM_CAP_S390_IRQ_STATE -Architectures: s390 -Type: vcpu ioctl -Parameters: struct kvm_s390_irq_state (in) -Returns: 0 on success, - -EFAULT if the buffer address was invalid, - -EINVAL for an invalid buffer length (see below), - -EBUSY if there were already interrupts pending, - errors occurring when actually injecting the +:Capability: KVM_CAP_S390_IRQ_STATE +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: struct kvm_s390_irq_state (in) +:Returns: 0 on success, + -EFAULT if the buffer address was invalid, + -EINVAL for an invalid buffer length (see below), + -EBUSY if there were already interrupts pending, + errors occurring when actually injecting the interrupt. See KVM_S390_IRQ. This ioctl allows userspace to set the complete state of all cpu-local interrupts currently pending for the vcpu. It is intended for restoring interrupt state after a migration. The input parameter is a userspace buffer -containing a struct kvm_s390_irq_state: +containing a struct kvm_s390_irq_state:: -struct kvm_s390_irq_state { + struct kvm_s390_irq_state { __u64 buf; __u32 flags; /* will stay unused for compatibility reasons */ __u32 len; __u32 reserved[4]; /* will stay unused for compatibility reasons */ -}; + }; The restrictions for flags and reserved apply as well. (see KVM_S390_GET_IRQ_STATE) @@ -3320,20 +3650,22 @@ and it must not exceed (max_vcpus + 32) * sizeof(struct kvm_s390_irq), which is the maximum number of possibly pending cpu-local interrupts. 4.96 KVM_SMI +------------ -Capability: KVM_CAP_X86_SMM -Architectures: x86 -Type: vcpu ioctl -Parameters: none -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_X86_SMM +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: none +:Returns: 0 on success, -1 on error Queues an SMI on the thread's vcpu. 4.97 KVM_CAP_PPC_MULTITCE +------------------------- -Capability: KVM_CAP_PPC_MULTITCE -Architectures: ppc -Type: vm +:Capability: KVM_CAP_PPC_MULTITCE +:Architectures: ppc +:Type: vm This capability means the kernel is capable of handling hypercalls H_PUT_TCE_INDIRECT and H_STUFF_TCE without passing those into the user @@ -3355,26 +3687,27 @@ an implementation for these despite the in kernel acceleration. This capability is always enabled. 4.98 KVM_CREATE_SPAPR_TCE_64 +---------------------------- -Capability: KVM_CAP_SPAPR_TCE_64 -Architectures: powerpc -Type: vm ioctl -Parameters: struct kvm_create_spapr_tce_64 (in) -Returns: file descriptor for manipulating the created TCE table +:Capability: KVM_CAP_SPAPR_TCE_64 +:Architectures: powerpc +:Type: vm ioctl +:Parameters: struct kvm_create_spapr_tce_64 (in) +:Returns: file descriptor for manipulating the created TCE table This is an extension for KVM_CAP_SPAPR_TCE which only supports 32bit windows, described in 4.62 KVM_CREATE_SPAPR_TCE -This capability uses extended struct in ioctl interface: +This capability uses extended struct in ioctl interface:: -/* for KVM_CAP_SPAPR_TCE_64 */ -struct kvm_create_spapr_tce_64 { + /* for KVM_CAP_SPAPR_TCE_64 */ + struct kvm_create_spapr_tce_64 { __u64 liobn; __u32 page_shift; __u32 flags; __u64 offset; /* in pages */ __u64 size; /* in pages */ -}; + }; The aim of extension is to support an additional bigger DMA window with a variable page size. @@ -3387,12 +3720,13 @@ of IOMMU pages. The rest of functionality is identical to KVM_CREATE_SPAPR_TCE. 4.99 KVM_REINJECT_CONTROL +------------------------- -Capability: KVM_CAP_REINJECT_CONTROL -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_reinject_control (in) -Returns: 0 on success, +:Capability: KVM_CAP_REINJECT_CONTROL +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_reinject_control (in) +:Returns: 0 on success, -EFAULT if struct kvm_reinject_control cannot be read, -ENXIO if KVM_CREATE_PIT or KVM_CREATE_PIT2 didn't succeed earlier. @@ -3402,21 +3736,24 @@ vector(s) that i8254 injects. Reinject mode dequeues a tick and injects its interrupt whenever there isn't a pending interrupt from i8254. !reinject mode injects an interrupt as soon as a tick arrives. -struct kvm_reinject_control { +:: + + struct kvm_reinject_control { __u8 pit_reinject; __u8 reserved[31]; -}; + }; pit_reinject = 0 (!reinject mode) is recommended, unless running an old operating system that uses the PIT for timing (e.g. Linux 2.4.x). 4.100 KVM_PPC_CONFIGURE_V3_MMU +------------------------------ -Capability: KVM_CAP_PPC_RADIX_MMU or KVM_CAP_PPC_HASH_MMU_V3 -Architectures: ppc -Type: vm ioctl -Parameters: struct kvm_ppc_mmuv3_cfg (in) -Returns: 0 on success, +:Capability: KVM_CAP_PPC_RADIX_MMU or KVM_CAP_PPC_HASH_MMU_V3 +:Architectures: ppc +:Type: vm ioctl +:Parameters: struct kvm_ppc_mmuv3_cfg (in) +:Returns: 0 on success, -EFAULT if struct kvm_ppc_mmuv3_cfg cannot be read, -EINVAL if the configuration is invalid @@ -3424,10 +3761,12 @@ This ioctl controls whether the guest will use radix or HPT (hashed page table) translation, and sets the pointer to the process table for the guest. -struct kvm_ppc_mmuv3_cfg { +:: + + struct kvm_ppc_mmuv3_cfg { __u64 flags; __u64 process_table; -}; + }; There are two bits that can be set in flags; KVM_PPC_MMUV3_RADIX and KVM_PPC_MMUV3_GTSE. KVM_PPC_MMUV3_RADIX, if set, configures the guest @@ -3442,12 +3781,13 @@ as the second doubleword of the partition table entry, as defined in the Power ISA V3.00, Book III section 5.7.6.1. 4.101 KVM_PPC_GET_RMMU_INFO +--------------------------- -Capability: KVM_CAP_PPC_RADIX_MMU -Architectures: ppc -Type: vm ioctl -Parameters: struct kvm_ppc_rmmu_info (out) -Returns: 0 on success, +:Capability: KVM_CAP_PPC_RADIX_MMU +:Architectures: ppc +:Type: vm ioctl +:Parameters: struct kvm_ppc_rmmu_info (out) +:Returns: 0 on success, -EFAULT if struct kvm_ppc_rmmu_info cannot be written, -EINVAL if no useful information can be returned @@ -3456,14 +3796,52 @@ containing supported radix tree geometries, and (b) a list that maps page sizes to put in the "AP" (actual page size) field for the tlbie (TLB invalidate entry) instruction. -struct kvm_ppc_rmmu_info { +:: + + struct kvm_ppc_rmmu_info { + struct kvm_ppc_radix_geom { + __u8 page_shift; + __u8 level_bits[4]; + __u8 pad[3]; + } geometries[8]; + __u32 ap_encodings[8]; + }; + +The geometries[] field gives up to 8 supported geometries for the +radix page table, in terms of the log base 2 of the smallest page +size, and the number of bits indexed at each level of the tree, from +the PTE level up to the PGD level in that order. Any unused entries +will have 0 in the page_shift field. + +The ap_encodings gives the supported page sizes and their AP field +encodings, encoded with the AP value in the top 3 bits and the log +base 2 of the page size in the bottom 6 bits. + +4.102 KVM_PPC_RESIZE_HPT_PREPARE +-------------------------------- + +:Capability: KVM_CAP_SPAPR_RESIZE_HPT +:Architectures: powerpc +:Type: vm ioctl +:Parameters: struct kvm_ppc_resize_hpt (in) +:Returns: 0 on successful completion, + >0 if a new HPT is being prepared, the value is an estimated + number of milliseconds until preparation is complete, + -EFAULT if struct kvm_reinject_control cannot be read, + -EINVAL if the supplied shift or flags are invalid, + -ENOMEM if unable to allocate the new HPT, + -ENOSPC if there was a hash collision + +:: + + struct kvm_ppc_rmmu_info { struct kvm_ppc_radix_geom { __u8 page_shift; __u8 level_bits[4]; __u8 pad[3]; } geometries[8]; __u32 ap_encodings[8]; -}; + }; The geometries[] field gives up to 8 supported geometries for the radix page table, in terms of the log base 2 of the smallest page @@ -3476,19 +3854,18 @@ encodings, encoded with the AP value in the top 3 bits and the log base 2 of the page size in the bottom 6 bits. 4.102 KVM_PPC_RESIZE_HPT_PREPARE +-------------------------------- -Capability: KVM_CAP_SPAPR_RESIZE_HPT -Architectures: powerpc -Type: vm ioctl -Parameters: struct kvm_ppc_resize_hpt (in) -Returns: 0 on successful completion, +:Capability: KVM_CAP_SPAPR_RESIZE_HPT +:Architectures: powerpc +:Type: vm ioctl +:Parameters: struct kvm_ppc_resize_hpt (in) +:Returns: 0 on successful completion, >0 if a new HPT is being prepared, the value is an estimated - number of milliseconds until preparation is complete + number of milliseconds until preparation is complete, -EFAULT if struct kvm_reinject_control cannot be read, - -EINVAL if the supplied shift or flags are invalid - -ENOMEM if unable to allocate the new HPT - -ENOSPC if there was a hash collision when moving existing - HPT entries to the new HPT + -EINVAL if the supplied shift or flags are invalid,when moving existing + HPT entries to the new HPT, -EIO on other error conditions Used to implement the PAPR extension for runtime resizing of a guest's @@ -3506,6 +3883,7 @@ requested in the parameters, discards the existing pending HPT and creates a new one as above. If called when there is a pending HPT of the size requested, will: + * If preparation of the pending HPT is already complete, return 0 * If preparation of the pending HPT has failed, return an error code, then discard the pending HPT. @@ -3522,26 +3900,29 @@ Normally this will be called repeatedly with the same parameters until it returns <= 0. The first call will initiate preparation, subsequent ones will monitor preparation until it completes or fails. -struct kvm_ppc_resize_hpt { +:: + + struct kvm_ppc_resize_hpt { __u64 flags; __u32 shift; __u32 pad; -}; + }; 4.103 KVM_PPC_RESIZE_HPT_COMMIT +------------------------------- -Capability: KVM_CAP_SPAPR_RESIZE_HPT -Architectures: powerpc -Type: vm ioctl -Parameters: struct kvm_ppc_resize_hpt (in) -Returns: 0 on successful completion, +:Capability: KVM_CAP_SPAPR_RESIZE_HPT +:Architectures: powerpc +:Type: vm ioctl +:Parameters: struct kvm_ppc_resize_hpt (in) +:Returns: 0 on successful completion, -EFAULT if struct kvm_reinject_control cannot be read, - -EINVAL if the supplied shift or flags are invalid + -EINVAL if the supplied shift or flags are invalid, -ENXIO is there is no pending HPT, or the pending HPT doesn't - have the requested size - -EBUSY if the pending HPT is not fully prepared + have the requested size, + -EBUSY if the pending HPT is not fully prepared, -ENOSPC if there was a hash collision when moving existing - HPT entries to the new HPT + HPT entries to the new HPT, -EIO on other error conditions Used to implement the PAPR extension for runtime resizing of a guest's @@ -3564,31 +3945,35 @@ HPT and the previous HPT will be discarded. On failure, the guest will still be operating on its previous HPT. -struct kvm_ppc_resize_hpt { +:: + + struct kvm_ppc_resize_hpt { __u64 flags; __u32 shift; __u32 pad; -}; + }; 4.104 KVM_X86_GET_MCE_CAP_SUPPORTED +----------------------------------- -Capability: KVM_CAP_MCE -Architectures: x86 -Type: system ioctl -Parameters: u64 mce_cap (out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_MCE +:Architectures: x86 +:Type: system ioctl +:Parameters: u64 mce_cap (out) +:Returns: 0 on success, -1 on error Returns supported MCE capabilities. The u64 mce_cap parameter has the same format as the MSR_IA32_MCG_CAP register. Supported capabilities will have the corresponding bits set. 4.105 KVM_X86_SETUP_MCE +----------------------- -Capability: KVM_CAP_MCE -Architectures: x86 -Type: vcpu ioctl -Parameters: u64 mcg_cap (in) -Returns: 0 on success, +:Capability: KVM_CAP_MCE +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: u64 mcg_cap (in) +:Returns: 0 on success, -EFAULT if u64 mcg_cap cannot be read, -EINVAL if the requested number of banks is invalid, -EINVAL if requested MCE capability is not supported. @@ -3601,20 +3986,21 @@ checking for KVM_CAP_MCE. The supported capabilities can be retrieved with KVM_X86_GET_MCE_CAP_SUPPORTED. 4.106 KVM_X86_SET_MCE +--------------------- -Capability: KVM_CAP_MCE -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_x86_mce (in) -Returns: 0 on success, +:Capability: KVM_CAP_MCE +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_x86_mce (in) +:Returns: 0 on success, -EFAULT if struct kvm_x86_mce cannot be read, -EINVAL if the bank number is invalid, -EINVAL if VAL bit is not set in status field. Inject a machine check error (MCE) into the guest. The input -parameter is: +parameter is:: -struct kvm_x86_mce { + struct kvm_x86_mce { __u64 status; __u64 addr; __u64 misc; @@ -3622,7 +4008,7 @@ struct kvm_x86_mce { __u8 bank; __u8 pad1[7]; __u64 pad2[3]; -}; + }; If the MCE being reported is an uncorrected error, KVM will inject it as an MCE exception into the guest. If the guest @@ -3634,15 +4020,17 @@ store it in the corresponding bank (provided this bank is not holding a previously reported uncorrected error). 4.107 KVM_S390_GET_CMMA_BITS +---------------------------- -Capability: KVM_CAP_S390_CMMA_MIGRATION -Architectures: s390 -Type: vm ioctl -Parameters: struct kvm_s390_cmma_log (in, out) -Returns: 0 on success, a negative value on error +:Capability: KVM_CAP_S390_CMMA_MIGRATION +:Architectures: s390 +:Type: vm ioctl +:Parameters: struct kvm_s390_cmma_log (in, out) +:Returns: 0 on success, a negative value on error This ioctl is used to get the values of the CMMA bits on the s390 architecture. It is meant to be used in two scenarios: + - During live migration to save the CMMA values. Live migration needs to be enabled via the KVM_REQ_START_MIGRATION VM property. - To non-destructively peek at the CMMA values, with the flag @@ -3652,9 +4040,12 @@ The ioctl takes parameters via the kvm_s390_cmma_log struct. The desired values are written to a buffer whose location is indicated via the "values" member in the kvm_s390_cmma_log struct. The values in the input struct are also updated as needed. + Each CMMA value takes up one byte. -struct kvm_s390_cmma_log { +:: + + struct kvm_s390_cmma_log { __u64 start_gfn; __u32 count; __u32 flags; @@ -3663,7 +4054,7 @@ struct kvm_s390_cmma_log { __u64 mask; }; __u64 values; -}; + }; start_gfn is the number of the first guest frame whose CMMA values are to be retrieved, @@ -3724,12 +4115,13 @@ KVM_S390_CMMA_PEEK is not set but migration mode was not enabled, with present for the addresses (e.g. when using hugepages). 4.108 KVM_S390_SET_CMMA_BITS +---------------------------- -Capability: KVM_CAP_S390_CMMA_MIGRATION -Architectures: s390 -Type: vm ioctl -Parameters: struct kvm_s390_cmma_log (in) -Returns: 0 on success, a negative value on error +:Capability: KVM_CAP_S390_CMMA_MIGRATION +:Architectures: s390 +:Type: vm ioctl +:Parameters: struct kvm_s390_cmma_log (in) +:Returns: 0 on success, a negative value on error This ioctl is used to set the values of the CMMA bits on the s390 architecture. It is meant to be used during live migration to restore @@ -3737,16 +4129,18 @@ the CMMA values, but there are no restrictions on its use. The ioctl takes parameters via the kvm_s390_cmma_values struct. Each CMMA value takes up one byte. -struct kvm_s390_cmma_log { +:: + + struct kvm_s390_cmma_log { __u64 start_gfn; __u32 count; __u32 flags; union { __u64 remaining; __u64 mask; - }; + }; __u64 values; -}; + }; start_gfn indicates the starting guest frame number, @@ -3769,26 +4163,27 @@ or if no page table is present for the addresses (e.g. when using hugepages). 4.109 KVM_PPC_GET_CPU_CHAR +-------------------------- -Capability: KVM_CAP_PPC_GET_CPU_CHAR -Architectures: powerpc -Type: vm ioctl -Parameters: struct kvm_ppc_cpu_char (out) -Returns: 0 on successful completion +:Capability: KVM_CAP_PPC_GET_CPU_CHAR +:Architectures: powerpc +:Type: vm ioctl +:Parameters: struct kvm_ppc_cpu_char (out) +:Returns: 0 on successful completion, -EFAULT if struct kvm_ppc_cpu_char cannot be written This ioctl gives userspace information about certain characteristics of the CPU relating to speculative execution of instructions and possible information leakage resulting from speculative execution (see CVE-2017-5715, CVE-2017-5753 and CVE-2017-5754). The information is -returned in struct kvm_ppc_cpu_char, which looks like this: +returned in struct kvm_ppc_cpu_char, which looks like this:: -struct kvm_ppc_cpu_char { + struct kvm_ppc_cpu_char { __u64 character; /* characteristics of the CPU */ __u64 behaviour; /* recommended software behaviour */ __u64 character_mask; /* valid bits in character */ __u64 behaviour_mask; /* valid bits in behaviour */ -}; + }; For extensibility, the character_mask and behaviour_mask fields indicate which bits of character and behaviour have been filled in by @@ -3815,12 +4210,13 @@ These fields use the same bit definitions as the new H_GET_CPU_CHARACTERISTICS hypercall. 4.110 KVM_MEMORY_ENCRYPT_OP +--------------------------- -Capability: basic -Architectures: x86 -Type: system -Parameters: an opaque platform specific structure (in/out) -Returns: 0 on success; -1 on error +:Capability: basic +:Architectures: x86 +:Type: system +:Parameters: an opaque platform specific structure (in/out) +:Returns: 0 on success; -1 on error If the platform supports creating encrypted VMs then this ioctl can be used for issuing platform-specific memory encryption commands to manage those @@ -3831,12 +4227,13 @@ Currently, this ioctl is used for issuing Secure Encrypted Virtualization Documentation/virt/kvm/amd-memory-encryption.rst. 4.111 KVM_MEMORY_ENCRYPT_REG_REGION +----------------------------------- -Capability: basic -Architectures: x86 -Type: system -Parameters: struct kvm_enc_region (in) -Returns: 0 on success; -1 on error +:Capability: basic +:Architectures: x86 +:Type: system +:Parameters: struct kvm_enc_region (in) +:Returns: 0 on success; -1 on error This ioctl can be used to register a guest memory region which may contain encrypted data (e.g. guest RAM, SMRAM etc). @@ -3854,60 +4251,71 @@ swap or migrate (move) ciphertext pages. Hence, for now we pin the guest memory region registered with the ioctl. 4.112 KVM_MEMORY_ENCRYPT_UNREG_REGION +------------------------------------- -Capability: basic -Architectures: x86 -Type: system -Parameters: struct kvm_enc_region (in) -Returns: 0 on success; -1 on error +:Capability: basic +:Architectures: x86 +:Type: system +:Parameters: struct kvm_enc_region (in) +:Returns: 0 on success; -1 on error This ioctl can be used to unregister the guest memory region registered with KVM_MEMORY_ENCRYPT_REG_REGION ioctl above. 4.113 KVM_HYPERV_EVENTFD +------------------------ -Capability: KVM_CAP_HYPERV_EVENTFD -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_hyperv_eventfd (in) +:Capability: KVM_CAP_HYPERV_EVENTFD +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_hyperv_eventfd (in) This ioctl (un)registers an eventfd to receive notifications from the guest on the specified Hyper-V connection id through the SIGNAL_EVENT hypercall, without causing a user exit. SIGNAL_EVENT hypercall with non-zero event flag number (bits 24-31) still triggers a KVM_EXIT_HYPERV_HCALL user exit. -struct kvm_hyperv_eventfd { +:: + + struct kvm_hyperv_eventfd { __u32 conn_id; __s32 fd; __u32 flags; __u32 padding[3]; -}; + }; -The conn_id field should fit within 24 bits: +The conn_id field should fit within 24 bits:: -#define KVM_HYPERV_CONN_ID_MASK 0x00ffffff + #define KVM_HYPERV_CONN_ID_MASK 0x00ffffff -The acceptable values for the flags field are: +The acceptable values for the flags field are:: -#define KVM_HYPERV_EVENTFD_DEASSIGN (1 << 0) + #define KVM_HYPERV_EVENTFD_DEASSIGN (1 << 0) -Returns: 0 on success, - -EINVAL if conn_id or flags is outside the allowed range - -ENOENT on deassign if the conn_id isn't registered - -EEXIST on assign if the conn_id is already registered +:Returns: 0 on success, + -EINVAL if conn_id or flags is outside the allowed range, + -ENOENT on deassign if the conn_id isn't registered, + -EEXIST on assign if the conn_id is already registered 4.114 KVM_GET_NESTED_STATE +-------------------------- + +:Capability: KVM_CAP_NESTED_STATE +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_nested_state (in/out) +:Returns: 0 on success, -1 on error -Capability: KVM_CAP_NESTED_STATE -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_nested_state (in/out) -Returns: 0 on success, -1 on error Errors: - E2BIG: the total state size exceeds the value of 'size' specified by + + ===== ============================================================= + E2BIG the total state size exceeds the value of 'size' specified by the user; the size required will be written into size. + ===== ============================================================= -struct kvm_nested_state { +:: + + struct kvm_nested_state { __u16 flags; __u16 format; __u32 size; @@ -3924,33 +4332,33 @@ struct kvm_nested_state { struct kvm_vmx_nested_state_data vmx[0]; struct kvm_svm_nested_state_data svm[0]; } data; -}; + }; -#define KVM_STATE_NESTED_GUEST_MODE 0x00000001 -#define KVM_STATE_NESTED_RUN_PENDING 0x00000002 -#define KVM_STATE_NESTED_EVMCS 0x00000004 + #define KVM_STATE_NESTED_GUEST_MODE 0x00000001 + #define KVM_STATE_NESTED_RUN_PENDING 0x00000002 + #define KVM_STATE_NESTED_EVMCS 0x00000004 -#define KVM_STATE_NESTED_FORMAT_VMX 0 -#define KVM_STATE_NESTED_FORMAT_SVM 1 + #define KVM_STATE_NESTED_FORMAT_VMX 0 + #define KVM_STATE_NESTED_FORMAT_SVM 1 -#define KVM_STATE_NESTED_VMX_VMCS_SIZE 0x1000 + #define KVM_STATE_NESTED_VMX_VMCS_SIZE 0x1000 -#define KVM_STATE_NESTED_VMX_SMM_GUEST_MODE 0x00000001 -#define KVM_STATE_NESTED_VMX_SMM_VMXON 0x00000002 + #define KVM_STATE_NESTED_VMX_SMM_GUEST_MODE 0x00000001 + #define KVM_STATE_NESTED_VMX_SMM_VMXON 0x00000002 -struct kvm_vmx_nested_state_hdr { + struct kvm_vmx_nested_state_hdr { __u64 vmxon_pa; __u64 vmcs12_pa; struct { __u16 flags; } smm; -}; + }; -struct kvm_vmx_nested_state_data { + struct kvm_vmx_nested_state_data { __u8 vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE]; __u8 shadow_vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE]; -}; + }; This ioctl copies the vcpu's nested virtualization state from the kernel to userspace. @@ -3959,24 +4367,26 @@ The maximum size of the state can be retrieved by passing KVM_CAP_NESTED_STATE to the KVM_CHECK_EXTENSION ioctl(). 4.115 KVM_SET_NESTED_STATE +-------------------------- -Capability: KVM_CAP_NESTED_STATE -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_nested_state (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_NESTED_STATE +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_nested_state (in) +:Returns: 0 on success, -1 on error This copies the vcpu's kvm_nested_state struct from userspace to the kernel. For the definition of struct kvm_nested_state, see KVM_GET_NESTED_STATE. 4.116 KVM_(UN)REGISTER_COALESCED_MMIO +------------------------------------- -Capability: KVM_CAP_COALESCED_MMIO (for coalesced mmio) - KVM_CAP_COALESCED_PIO (for coalesced pio) -Architectures: all -Type: vm ioctl -Parameters: struct kvm_coalesced_mmio_zone -Returns: 0 on success, < 0 on error +:Capability: KVM_CAP_COALESCED_MMIO (for coalesced mmio) + KVM_CAP_COALESCED_PIO (for coalesced pio) +:Architectures: all +:Type: vm ioctl +:Parameters: struct kvm_coalesced_mmio_zone +:Returns: 0 on success, < 0 on error Coalesced I/O is a performance optimization that defers hardware register write emulation so that userspace exits are avoided. It is @@ -3998,15 +4408,18 @@ between coalesced mmio and pio except that coalesced pio records accesses to I/O ports. 4.117 KVM_CLEAR_DIRTY_LOG (vm ioctl) +------------------------------------ -Capability: KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 -Architectures: x86, arm, arm64, mips -Type: vm ioctl -Parameters: struct kvm_dirty_log (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 +:Architectures: x86, arm, arm64, mips +:Type: vm ioctl +:Parameters: struct kvm_dirty_log (in) +:Returns: 0 on success, -1 on error -/* for KVM_CLEAR_DIRTY_LOG */ -struct kvm_clear_dirty_log { +:: + + /* for KVM_CLEAR_DIRTY_LOG */ + struct kvm_clear_dirty_log { __u32 slot; __u32 num_pages; __u64 first_page; @@ -4014,7 +4427,7 @@ struct kvm_clear_dirty_log { void __user *dirty_bitmap; /* one bit per page */ __u64 padding; }; -}; + }; The ioctl clears the dirty status of pages in a memory slot, according to the bitmap that is passed in struct kvm_clear_dirty_log's dirty_bitmap @@ -4038,20 +4451,23 @@ However, it can always be used as long as KVM_CHECK_EXTENSION confirms that KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 is present. 4.118 KVM_GET_SUPPORTED_HV_CPUID +-------------------------------- -Capability: KVM_CAP_HYPERV_CPUID -Architectures: x86 -Type: vcpu ioctl -Parameters: struct kvm_cpuid2 (in/out) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_HYPERV_CPUID +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_cpuid2 (in/out) +:Returns: 0 on success, -1 on error -struct kvm_cpuid2 { +:: + + struct kvm_cpuid2 { __u32 nent; __u32 padding; struct kvm_cpuid_entry2 entries[0]; -}; + }; -struct kvm_cpuid_entry2 { + struct kvm_cpuid_entry2 { __u32 function; __u32 index; __u32 flags; @@ -4060,7 +4476,7 @@ struct kvm_cpuid_entry2 { __u32 ecx; __u32 edx; __u32 padding[3]; -}; + }; This ioctl returns x86 cpuid features leaves related to Hyper-V emulation in KVM. Userspace can use the information returned by this ioctl to construct @@ -4073,13 +4489,13 @@ KVM_GET_SUPPORTED_CPUID ioctl because some of them intersect with KVM feature leaves (0x40000000, 0x40000001). Currently, the following list of CPUID leaves are returned: - HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS - HYPERV_CPUID_INTERFACE - HYPERV_CPUID_VERSION - HYPERV_CPUID_FEATURES - HYPERV_CPUID_ENLIGHTMENT_INFO - HYPERV_CPUID_IMPLEMENT_LIMITS - HYPERV_CPUID_NESTED_FEATURES + - HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS + - HYPERV_CPUID_INTERFACE + - HYPERV_CPUID_VERSION + - HYPERV_CPUID_FEATURES + - HYPERV_CPUID_ENLIGHTMENT_INFO + - HYPERV_CPUID_IMPLEMENT_LIMITS + - HYPERV_CPUID_NESTED_FEATURES HYPERV_CPUID_NESTED_FEATURES leaf is only exposed when Enlightened VMCS was enabled on the corresponding vCPU (KVM_CAP_HYPERV_ENLIGHTENED_VMCS). @@ -4095,17 +4511,25 @@ number of valid entries in the 'entries' array, which is then filled. userspace should not expect to get any particular value there. 4.119 KVM_ARM_VCPU_FINALIZE +--------------------------- + +:Architectures: arm, arm64 +:Type: vcpu ioctl +:Parameters: int feature (in) +:Returns: 0 on success, -1 on error -Architectures: arm, arm64 -Type: vcpu ioctl -Parameters: int feature (in) -Returns: 0 on success, -1 on error Errors: - EPERM: feature not enabled, needs configuration, or already finalized - EINVAL: feature unknown or not present + + ====== ============================================================== + EPERM feature not enabled, needs configuration, or already finalized + EINVAL feature unknown or not present + ====== ============================================================== Recognised values for feature: + + ===== =========================================== arm64 KVM_ARM_VCPU_SVE (requires KVM_CAP_ARM_SVE) + ===== =========================================== Finalizes the configuration of the specified vcpu feature. @@ -4129,21 +4553,24 @@ See KVM_ARM_VCPU_INIT for details of vcpu features that require finalization using this ioctl. 4.120 KVM_SET_PMU_EVENT_FILTER +------------------------------ -Capability: KVM_CAP_PMU_EVENT_FILTER -Architectures: x86 -Type: vm ioctl -Parameters: struct kvm_pmu_event_filter (in) -Returns: 0 on success, -1 on error +:Capability: KVM_CAP_PMU_EVENT_FILTER +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_pmu_event_filter (in) +:Returns: 0 on success, -1 on error -struct kvm_pmu_event_filter { +:: + + struct kvm_pmu_event_filter { __u32 action; __u32 nevents; __u32 fixed_counter_bitmap; __u32 flags; __u32 pad[4]; __u64 events[0]; -}; + }; This ioctl restricts the set of PMU events that the guest can program. The argument holds a list of events which will be allowed or denied. @@ -4154,20 +4581,26 @@ counters are controlled by the fixed_counter_bitmap. No flags are defined yet, the field must be zero. -Valid values for 'action': -#define KVM_PMU_EVENT_ALLOW 0 -#define KVM_PMU_EVENT_DENY 1 +Valid values for 'action':: + + #define KVM_PMU_EVENT_ALLOW 0 + #define KVM_PMU_EVENT_DENY 1 4.121 KVM_PPC_SVM_OFF +--------------------- + +:Capability: basic +:Architectures: powerpc +:Type: vm ioctl +:Parameters: none +:Returns: 0 on successful completion, -Capability: basic -Architectures: powerpc -Type: vm ioctl -Parameters: none -Returns: 0 on successful completion, Errors: - EINVAL: if ultravisor failed to terminate the secure guest - ENOMEM: if hypervisor failed to allocate new radix page tables for guest + + ====== ================================================================ + EINVAL if ultravisor failed to terminate the secure guest + ENOMEM if hypervisor failed to allocate new radix page tables for guest + ====== ================================================================ This ioctl is used to turn off the secure mode of the guest or transition the guest from secure mode to normal mode. This is invoked when the guest @@ -4214,7 +4647,7 @@ into ESA mode. This reset is a superset of the initial reset. 5. The kvm_run structure ------------------------- +======================== Application code obtains a pointer to the kvm_run structure by mmap()ing a vcpu fd. From that point, application code can control @@ -4222,13 +4655,17 @@ execution by changing fields in kvm_run prior to calling the KVM_RUN ioctl, and obtain information about the reason KVM_RUN returned by looking up structure members. -struct kvm_run { +:: + + struct kvm_run { /* in */ __u8 request_interrupt_window; Request that KVM_RUN return when it becomes possible to inject external interrupts into the guest. Useful in conjunction with KVM_INTERRUPT. +:: + __u8 immediate_exit; This field is polled once when KVM_RUN starts; if non-zero, KVM_RUN @@ -4240,6 +4677,8 @@ a signal handler that sets run->immediate_exit to a non-zero value. This field is ignored if KVM_CAP_IMMEDIATE_EXIT is not available. +:: + __u8 padding1[6]; /* out */ @@ -4249,16 +4688,22 @@ When KVM_RUN has returned successfully (return value 0), this informs application code why KVM_RUN has returned. Allowable values for this field are detailed below. +:: + __u8 ready_for_interrupt_injection; If request_interrupt_window has been specified, this field indicates an interrupt can be injected now with KVM_INTERRUPT. +:: + __u8 if_flag; The value of the current interrupt flag. Only valid if in-kernel local APIC is not used. +:: + __u16 flags; More architecture-specific flags detailing state of the VCPU that may @@ -4266,17 +4711,23 @@ affect the device's behavior. The only currently defined flag is KVM_RUN_X86_SMM, which is valid on x86 machines and is set if the VCPU is in system management mode. +:: + /* in (pre_kvm_run), out (post_kvm_run) */ __u64 cr8; The value of the cr8 register. Only valid if in-kernel local APIC is not used. Both input and output. +:: + __u64 apic_base; The value of the APIC BASE msr. Only valid if in-kernel local APIC is not used. Both input and output. +:: + union { /* KVM_EXIT_UNKNOWN */ struct { @@ -4287,6 +4738,8 @@ If exit_reason is KVM_EXIT_UNKNOWN, the vcpu has exited due to unknown reasons. Further architecture-specific information is available in hardware_exit_reason. +:: + /* KVM_EXIT_FAIL_ENTRY */ struct { __u64 hardware_entry_failure_reason; @@ -4296,6 +4749,8 @@ If exit_reason is KVM_EXIT_FAIL_ENTRY, the vcpu could not be run due to unknown reasons. Further architecture-specific information is available in hardware_entry_failure_reason. +:: + /* KVM_EXIT_EXCEPTION */ struct { __u32 exception; @@ -4304,10 +4759,12 @@ available in hardware_entry_failure_reason. Unused. +:: + /* KVM_EXIT_IO */ struct { -#define KVM_EXIT_IO_IN 0 -#define KVM_EXIT_IO_OUT 1 + #define KVM_EXIT_IO_IN 0 + #define KVM_EXIT_IO_OUT 1 __u8 direction; __u8 size; /* bytes */ __u16 port; @@ -4321,6 +4778,8 @@ data_offset describes where the data is located (KVM_EXIT_IO_OUT) or where kvm expects application code to place the data for the next KVM_RUN invocation (KVM_EXIT_IO_IN). Data format is a packed array. +:: + /* KVM_EXIT_DEBUG */ struct { struct kvm_debug_exit_arch arch; @@ -4329,6 +4788,8 @@ KVM_RUN invocation (KVM_EXIT_IO_IN). Data format is a packed array. If the exit_reason is KVM_EXIT_DEBUG, then a vcpu is processing a debug event for which architecture specific information is returned. +:: + /* KVM_EXIT_MMIO */ struct { __u64 phys_addr; @@ -4346,14 +4807,19 @@ The 'data' member contains, in its first 'len' bytes, the value as it would appear if the VCPU performed a load or store of the appropriate width directly to the byte array. -NOTE: For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR and +.. note:: + + For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR and KVM_EXIT_EPR the corresponding + operations are complete (and guest state is consistent) only after userspace has re-entered the kernel with KVM_RUN. The kernel side will first finish incomplete operations and then check for pending signals. Userspace can re-enter the guest with an unmasked signal pending to complete pending operations. +:: + /* KVM_EXIT_HYPERCALL */ struct { __u64 nr; @@ -4365,7 +4831,10 @@ pending operations. Unused. This was once used for 'hypercall to userspace'. To implement such functionality, use KVM_EXIT_IO (x86) or KVM_EXIT_MMIO (all except s390). -Note KVM_EXIT_IO is significantly faster than KVM_EXIT_MMIO. + +.. note:: KVM_EXIT_IO is significantly faster than KVM_EXIT_MMIO. + +:: /* KVM_EXIT_TPR_ACCESS */ struct { @@ -4376,6 +4845,8 @@ Note KVM_EXIT_IO is significantly faster than KVM_EXIT_MMIO. To be documented (KVM_TPR_ACCESS_REPORTING). +:: + /* KVM_EXIT_S390_SIEIC */ struct { __u8 icptcode; @@ -4387,16 +4858,20 @@ To be documented (KVM_TPR_ACCESS_REPORTING). s390 specific. +:: + /* KVM_EXIT_S390_RESET */ -#define KVM_S390_RESET_POR 1 -#define KVM_S390_RESET_CLEAR 2 -#define KVM_S390_RESET_SUBSYSTEM 4 -#define KVM_S390_RESET_CPU_INIT 8 -#define KVM_S390_RESET_IPL 16 + #define KVM_S390_RESET_POR 1 + #define KVM_S390_RESET_CLEAR 2 + #define KVM_S390_RESET_SUBSYSTEM 4 + #define KVM_S390_RESET_CPU_INIT 8 + #define KVM_S390_RESET_IPL 16 __u64 s390_reset_flags; s390 specific. +:: + /* KVM_EXIT_S390_UCONTROL */ struct { __u64 trans_exc_code; @@ -4411,6 +4886,8 @@ in the cpu's lowcore are presented here as defined by the z Architecture Principles of Operation Book in the Chapter for Dynamic Address Translation (DAT) +:: + /* KVM_EXIT_DCR */ struct { __u32 dcrn; @@ -4420,6 +4897,8 @@ Principles of Operation Book in the Chapter for Dynamic Address Translation Deprecated - was used for 440 KVM. +:: + /* KVM_EXIT_OSI */ struct { __u64 gprs[32]; @@ -4433,6 +4912,8 @@ Userspace can now handle the hypercall and when it's done modify the gprs as necessary. Upon guest entry all guest GPRs will then be replaced by the values in this struct. +:: + /* KVM_EXIT_PAPR_HCALL */ struct { __u64 nr; @@ -4450,6 +4931,8 @@ The possible hypercalls are defined in the Power Architecture Platform Requirements (PAPR) document available from www.power.org (free developer registration required to access it). +:: + /* KVM_EXIT_S390_TSCH */ struct { __u16 subchannel_id; @@ -4466,6 +4949,8 @@ interrupt for the target subchannel has been dequeued and subchannel_id, subchannel_nr, io_int_parm and io_int_word contain the parameters for that interrupt. ipb is needed for instruction parameter decoding. +:: + /* KVM_EXIT_EPR */ struct { __u32 epr; @@ -4485,11 +4970,13 @@ It gets triggered whenever both KVM_CAP_PPC_EPR are enabled and an external interrupt has just been delivered into the guest. User space should put the acknowledged interrupt vector into the 'epr' field. +:: + /* KVM_EXIT_SYSTEM_EVENT */ struct { -#define KVM_SYSTEM_EVENT_SHUTDOWN 1 -#define KVM_SYSTEM_EVENT_RESET 2 -#define KVM_SYSTEM_EVENT_CRASH 3 + #define KVM_SYSTEM_EVENT_SHUTDOWN 1 + #define KVM_SYSTEM_EVENT_RESET 2 + #define KVM_SYSTEM_EVENT_CRASH 3 __u32 type; __u64 flags; } system_event; @@ -4502,18 +4989,21 @@ the system-level event type. The 'flags' field describes architecture specific flags for the system-level event. Valid values for 'type' are: - KVM_SYSTEM_EVENT_SHUTDOWN -- the guest has requested a shutdown of the + + - KVM_SYSTEM_EVENT_SHUTDOWN -- the guest has requested a shutdown of the VM. Userspace is not obliged to honour this, and if it does honour this does not need to destroy the VM synchronously (ie it may call KVM_RUN again before shutdown finally occurs). - KVM_SYSTEM_EVENT_RESET -- the guest has requested a reset of the VM. + - KVM_SYSTEM_EVENT_RESET -- the guest has requested a reset of the VM. As with SHUTDOWN, userspace can choose to ignore the request, or to schedule the reset to occur in the future and may call KVM_RUN again. - KVM_SYSTEM_EVENT_CRASH -- the guest crash occurred and the guest + - KVM_SYSTEM_EVENT_CRASH -- the guest crash occurred and the guest has requested a crash condition maintenance. Userspace can choose to ignore the request, or to gather VM memory core dump and/or reset/shutdown of the VM. +:: + /* KVM_EXIT_IOAPIC_EOI */ struct { __u8 vector; @@ -4526,9 +5016,11 @@ the userspace IOAPIC should process the EOI and retrigger the interrupt if it is still asserted. Vector is the LAPIC interrupt vector for which the EOI was received. +:: + struct kvm_hyperv_exit { -#define KVM_EXIT_HYPERV_SYNIC 1 -#define KVM_EXIT_HYPERV_HCALL 2 + #define KVM_EXIT_HYPERV_SYNIC 1 + #define KVM_EXIT_HYPERV_HCALL 2 __u32 type; union { struct { @@ -4546,14 +5038,20 @@ EOI was received. }; /* KVM_EXIT_HYPERV */ struct kvm_hyperv_exit hyperv; + Indicates that the VCPU exits into userspace to process some tasks related to Hyper-V emulation. + Valid values for 'type' are: - KVM_EXIT_HYPERV_SYNIC -- synchronously notify user-space about + + - KVM_EXIT_HYPERV_SYNIC -- synchronously notify user-space about + Hyper-V SynIC state change. Notification is used to remap SynIC event/message pages and to enable/disable SynIC messages/events processing in userspace. +:: + /* KVM_EXIT_ARM_NISV */ struct { __u64 esr_iss; @@ -4587,6 +5085,8 @@ Note that KVM does not skip the faulting instruction as it does for KVM_EXIT_MMIO, but userspace has to emulate any change to the processing state if it decides to decode and emulate the instruction. +:: + /* Fix the size of the union. */ char padding[256]; }; @@ -4611,18 +5111,20 @@ avoid some system call overhead if userspace has to handle the exit. Userspace can query the validity of the structure by checking kvm_valid_regs for specific bits. These bits are architecture specific and usually define the validity of a groups of registers. (e.g. one bit - for general purpose registers) +for general purpose registers) Please note that the kernel is allowed to use the kvm_run structure as the primary storage for certain register types. Therefore, the kernel may use the values in kvm_run even if the corresponding bit in kvm_dirty_regs is not set. -}; +:: + + }; 6. Capabilities that can be enabled on vCPUs --------------------------------------------- +============================================ There are certain capabilities that change the behavior of the virtual CPU or the virtual machine when enabled. To enable them, please see section 4.37. @@ -4631,23 +5133,28 @@ the virtual machine is when enabling them. The following information is provided along with the description: - Architectures: which instruction set architectures provide this ioctl. + Architectures: + which instruction set architectures provide this ioctl. x86 includes both i386 and x86_64. - Target: whether this is a per-vcpu or per-vm capability. + Target: + whether this is a per-vcpu or per-vm capability. - Parameters: what parameters are accepted by the capability. + Parameters: + what parameters are accepted by the capability. - Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL) + Returns: + the return value. General error numbers (EBADF, ENOMEM, EINVAL) are not detailed, but errors with specific meanings are. 6.1 KVM_CAP_PPC_OSI +------------------- -Architectures: ppc -Target: vcpu -Parameters: none -Returns: 0 on success; -1 on error +:Architectures: ppc +:Target: vcpu +:Parameters: none +:Returns: 0 on success; -1 on error This capability enables interception of OSI hypercalls that otherwise would be treated as normal system calls to be injected into the guest. OSI hypercalls @@ -4658,11 +5165,12 @@ When this capability is enabled, KVM_EXIT_OSI can occur. 6.2 KVM_CAP_PPC_PAPR +-------------------- -Architectures: ppc -Target: vcpu -Parameters: none -Returns: 0 on success; -1 on error +:Architectures: ppc +:Target: vcpu +:Parameters: none +:Returns: 0 on success; -1 on error This capability enables interception of PAPR hypercalls. PAPR hypercalls are done using the hypercall instruction "sc 1". @@ -4678,18 +5186,21 @@ When this capability is enabled, KVM_EXIT_PAPR_HCALL can occur. 6.3 KVM_CAP_SW_TLB +------------------ -Architectures: ppc -Target: vcpu -Parameters: args[0] is the address of a struct kvm_config_tlb -Returns: 0 on success; -1 on error +:Architectures: ppc +:Target: vcpu +:Parameters: args[0] is the address of a struct kvm_config_tlb +:Returns: 0 on success; -1 on error -struct kvm_config_tlb { +:: + + struct kvm_config_tlb { __u64 params; __u64 array; __u32 mmu_type; __u32 array_len; -}; + }; Configures the virtual CPU's TLB array, establishing a shared memory area between userspace and KVM. The "params" and "array" fields are userspace @@ -4708,6 +5219,7 @@ to tell KVM which entries have been changed, prior to calling KVM_RUN again on this vcpu. For mmu types KVM_MMU_FSL_BOOKE_NOHV and KVM_MMU_FSL_BOOKE_HV: + - The "params" field is of type "struct kvm_book3e_206_tlb_params". - The "array" field points to an array of type "struct kvm_book3e_206_tlb_entry". @@ -4721,11 +5233,12 @@ For mmu types KVM_MMU_FSL_BOOKE_NOHV and KVM_MMU_FSL_BOOKE_HV: hardware ignores this value for TLB0. 6.4 KVM_CAP_S390_CSS_SUPPORT +---------------------------- -Architectures: s390 -Target: vcpu -Parameters: none -Returns: 0 on success; -1 on error +:Architectures: s390 +:Target: vcpu +:Parameters: none +:Returns: 0 on success; -1 on error This capability enables support for handling of channel I/O instructions. @@ -4739,11 +5252,12 @@ Note that even though this capability is enabled per-vcpu, the complete virtual machine is affected. 6.5 KVM_CAP_PPC_EPR +------------------- -Architectures: ppc -Target: vcpu -Parameters: args[0] defines whether the proxy facility is active -Returns: 0 on success; -1 on error +:Architectures: ppc +:Target: vcpu +:Parameters: args[0] defines whether the proxy facility is active +:Returns: 0 on success; -1 on error This capability enables or disables the delivery of interrupts through the external proxy facility. @@ -4757,62 +5271,70 @@ When disabled (args[0] == 0), behavior is as if this facility is unsupported. When this capability is enabled, KVM_EXIT_EPR can occur. 6.6 KVM_CAP_IRQ_MPIC +-------------------- -Architectures: ppc -Parameters: args[0] is the MPIC device fd - args[1] is the MPIC CPU number for this vcpu +:Architectures: ppc +:Parameters: args[0] is the MPIC device fd; + args[1] is the MPIC CPU number for this vcpu This capability connects the vcpu to an in-kernel MPIC device. 6.7 KVM_CAP_IRQ_XICS +-------------------- -Architectures: ppc -Target: vcpu -Parameters: args[0] is the XICS device fd - args[1] is the XICS CPU number (server ID) for this vcpu +:Architectures: ppc +:Target: vcpu +:Parameters: args[0] is the XICS device fd; + args[1] is the XICS CPU number (server ID) for this vcpu This capability connects the vcpu to an in-kernel XICS device. 6.8 KVM_CAP_S390_IRQCHIP +------------------------ -Architectures: s390 -Target: vm -Parameters: none +:Architectures: s390 +:Target: vm +:Parameters: none This capability enables the in-kernel irqchip for s390. Please refer to "4.24 KVM_CREATE_IRQCHIP" for details. 6.9 KVM_CAP_MIPS_FPU +-------------------- -Architectures: mips -Target: vcpu -Parameters: args[0] is reserved for future use (should be 0). +:Architectures: mips +:Target: vcpu +:Parameters: args[0] is reserved for future use (should be 0). This capability allows the use of the host Floating Point Unit by the guest. It allows the Config1.FP bit to be set to enable the FPU in the guest. Once this is -done the KVM_REG_MIPS_FPR_* and KVM_REG_MIPS_FCR_* registers can be accessed -(depending on the current guest FPU register mode), and the Status.FR, +done the ``KVM_REG_MIPS_FPR_*`` and ``KVM_REG_MIPS_FCR_*`` registers can be +accessed (depending on the current guest FPU register mode), and the Status.FR, Config5.FRE bits are accessible via the KVM API and also from the guest, depending on them being supported by the FPU. 6.10 KVM_CAP_MIPS_MSA +--------------------- -Architectures: mips -Target: vcpu -Parameters: args[0] is reserved for future use (should be 0). +:Architectures: mips +:Target: vcpu +:Parameters: args[0] is reserved for future use (should be 0). This capability allows the use of the MIPS SIMD Architecture (MSA) by the guest. It allows the Config3.MSAP bit to be set to enable the use of MSA by the guest. -Once this is done the KVM_REG_MIPS_VEC_* and KVM_REG_MIPS_MSA_* registers can be -accessed, and the Config5.MSAEn bit is accessible via the KVM API and also from -the guest. +Once this is done the ``KVM_REG_MIPS_VEC_*`` and ``KVM_REG_MIPS_MSA_*`` +registers can be accessed, and the Config5.MSAEn bit is accessible via the +KVM API and also from the guest. 6.74 KVM_CAP_SYNC_REGS -Architectures: s390, x86 -Target: s390: always enabled, x86: vcpu -Parameters: none -Returns: x86: KVM_CHECK_EXTENSION returns a bit-array indicating which register -sets are supported (bitfields defined in arch/x86/include/uapi/asm/kvm.h). +---------------------- + +:Architectures: s390, x86 +:Target: s390: always enabled, x86: vcpu +:Parameters: none +:Returns: x86: KVM_CHECK_EXTENSION returns a bit-array indicating which register + sets are supported + (bitfields defined in arch/x86/include/uapi/asm/kvm.h). As described above in the kvm_sync_regs struct info in section 5 (kvm_run): KVM_CAP_SYNC_REGS "allow[s] userspace to access certain guest registers @@ -4825,6 +5347,7 @@ userspace. For s390 specifics, please refer to the source code. For x86: + - the register sets to be copied out to kvm_run are selectable by userspace (rather that all sets being copied out for every exit). - vcpu_events are available in addition to regs and sregs. @@ -4841,23 +5364,26 @@ into the vCPU even if they've been modified. Unused bitfields in the bitarrays must be set to zero. -struct kvm_sync_regs { +:: + + struct kvm_sync_regs { struct kvm_regs regs; struct kvm_sregs sregs; struct kvm_vcpu_events events; -}; + }; 6.75 KVM_CAP_PPC_IRQ_XIVE +------------------------- -Architectures: ppc -Target: vcpu -Parameters: args[0] is the XIVE device fd - args[1] is the XIVE CPU number (server ID) for this vcpu +:Architectures: ppc +:Target: vcpu +:Parameters: args[0] is the XIVE device fd; + args[1] is the XIVE CPU number (server ID) for this vcpu This capability connects the vcpu to an in-kernel XIVE device. 7. Capabilities that can be enabled on VMs ------------------------------------------- +========================================== There are certain capabilities that change the behavior of the virtual machine when enabled. To enable them, please see section 4.37. Below @@ -4866,20 +5392,24 @@ is when enabling them. The following information is provided along with the description: - Architectures: which instruction set architectures provide this ioctl. + Architectures: + which instruction set architectures provide this ioctl. x86 includes both i386 and x86_64. - Parameters: what parameters are accepted by the capability. + Parameters: + what parameters are accepted by the capability. - Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL) + Returns: + the return value. General error numbers (EBADF, ENOMEM, EINVAL) are not detailed, but errors with specific meanings are. 7.1 KVM_CAP_PPC_ENABLE_HCALL +---------------------------- -Architectures: ppc -Parameters: args[0] is the sPAPR hcall number - args[1] is 0 to disable, 1 to enable in-kernel handling +:Architectures: ppc +:Parameters: args[0] is the sPAPR hcall number; + args[1] is 0 to disable, 1 to enable in-kernel handling This capability controls whether individual sPAPR hypercalls (hcalls) get handled by the kernel or not. Enabling or disabling in-kernel @@ -4897,13 +5427,15 @@ implementation, the KVM_ENABLE_CAP ioctl will fail with an EINVAL error. 7.2 KVM_CAP_S390_USER_SIGP +-------------------------- -Architectures: s390 -Parameters: none +:Architectures: s390 +:Parameters: none This capability controls which SIGP orders will be handled completely in user space. With this capability enabled, all fast orders will be handled completely in the kernel: + - SENSE - SENSE RUNNING - EXTERNAL CALL @@ -4917,48 +5449,52 @@ in the hardware prior to interception). If this capability is not enabled, the old way of handling SIGP orders is used (partially in kernel and user space). 7.3 KVM_CAP_S390_VECTOR_REGISTERS +--------------------------------- -Architectures: s390 -Parameters: none -Returns: 0 on success, negative value on error +:Architectures: s390 +:Parameters: none +:Returns: 0 on success, negative value on error Allows use of the vector registers introduced with z13 processor, and provides for the synchronization between host and user space. Will return -EINVAL if the machine does not support vectors. 7.4 KVM_CAP_S390_USER_STSI +-------------------------- -Architectures: s390 -Parameters: none +:Architectures: s390 +:Parameters: none This capability allows post-handlers for the STSI instruction. After initial handling in the kernel, KVM exits to user space with KVM_EXIT_S390_STSI to allow user space to insert further data. Before exiting to userspace, kvm handlers should fill in s390_stsi field of -vcpu->run: -struct { +vcpu->run:: + + struct { __u64 addr; __u8 ar; __u8 reserved; __u8 fc; __u8 sel1; __u16 sel2; -} s390_stsi; + } s390_stsi; -@addr - guest address of STSI SYSIB -@fc - function code -@sel1 - selector 1 -@sel2 - selector 2 -@ar - access register number + @addr - guest address of STSI SYSIB + @fc - function code + @sel1 - selector 1 + @sel2 - selector 2 + @ar - access register number KVM handlers should exit to userspace with rc = -EREMOTE. 7.5 KVM_CAP_SPLIT_IRQCHIP +------------------------- -Architectures: x86 -Parameters: args[0] - number of routes reserved for userspace IOAPICs -Returns: 0 on success, -1 on error +:Architectures: x86 +:Parameters: args[0] - number of routes reserved for userspace IOAPICs +:Returns: 0 on success, -1 on error Create a local apic for each processor in the kernel. This can be used instead of KVM_CREATE_IRQCHIP if the userspace VMM wishes to emulate the @@ -4975,24 +5511,26 @@ Fails if VCPU has already been created, or if the irqchip is already in the kernel (i.e. KVM_CREATE_IRQCHIP has already been called). 7.6 KVM_CAP_S390_RI +------------------- -Architectures: s390 -Parameters: none +:Architectures: s390 +:Parameters: none Allows use of runtime-instrumentation introduced with zEC12 processor. Will return -EINVAL if the machine does not support runtime-instrumentation. Will return -EBUSY if a VCPU has already been created. 7.7 KVM_CAP_X2APIC_API +---------------------- -Architectures: x86 -Parameters: args[0] - features that should be enabled -Returns: 0 on success, -EINVAL when args[0] contains invalid features +:Architectures: x86 +:Parameters: args[0] - features that should be enabled +:Returns: 0 on success, -EINVAL when args[0] contains invalid features -Valid feature flags in args[0] are +Valid feature flags in args[0] are:: -#define KVM_X2APIC_API_USE_32BIT_IDS (1ULL << 0) -#define KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK (1ULL << 1) + #define KVM_X2APIC_API_USE_32BIT_IDS (1ULL << 0) + #define KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK (1ULL << 1) Enabling KVM_X2APIC_API_USE_32BIT_IDS changes the behavior of KVM_SET_GSI_ROUTING, KVM_SIGNAL_MSI, KVM_SET_LAPIC, and KVM_GET_LAPIC, @@ -5006,9 +5544,10 @@ without interrupt remapping. This is undesirable in logical mode, where 0xff represents CPUs 0-7 in cluster 0. 7.8 KVM_CAP_S390_USER_INSTR0 +---------------------------- -Architectures: s390 -Parameters: none +:Architectures: s390 +:Parameters: none With this capability enabled, all illegal instructions 0x0000 (2 bytes) will be intercepted and forwarded to user space. User space can use this @@ -5020,26 +5559,29 @@ This capability can be enabled dynamically even if VCPUs were already created and are running. 7.9 KVM_CAP_S390_GS +------------------- -Architectures: s390 -Parameters: none -Returns: 0 on success; -EINVAL if the machine does not support - guarded storage; -EBUSY if a VCPU has already been created. +:Architectures: s390 +:Parameters: none +:Returns: 0 on success; -EINVAL if the machine does not support + guarded storage; -EBUSY if a VCPU has already been created. Allows use of guarded storage for the KVM guest. 7.10 KVM_CAP_S390_AIS +--------------------- -Architectures: s390 -Parameters: none +:Architectures: s390 +:Parameters: none Allow use of adapter-interruption suppression. -Returns: 0 on success; -EBUSY if a VCPU has already been created. +:Returns: 0 on success; -EBUSY if a VCPU has already been created. 7.11 KVM_CAP_PPC_SMT +-------------------- -Architectures: ppc -Parameters: vsmt_mode, flags +:Architectures: ppc +:Parameters: vsmt_mode, flags Enabling this capability on a VM provides userspace with a way to set the desired virtual SMT mode (i.e. the number of virtual CPUs per @@ -5054,9 +5596,10 @@ The KVM_CAP_PPC_SMT_POSSIBLE capability indicates which virtual SMT modes are available. 7.12 KVM_CAP_PPC_FWNMI +---------------------- -Architectures: ppc -Parameters: none +:Architectures: ppc +:Parameters: none With this capability a machine check exception in the guest address space will cause KVM to exit the guest with NMI exit reason. This @@ -5065,17 +5608,18 @@ machine check handling routine. Without this capability KVM will branch to guests' 0x200 interrupt vector. 7.13 KVM_CAP_X86_DISABLE_EXITS +------------------------------ -Architectures: x86 -Parameters: args[0] defines which exits are disabled -Returns: 0 on success, -EINVAL when args[0] contains invalid exits +:Architectures: x86 +:Parameters: args[0] defines which exits are disabled +:Returns: 0 on success, -EINVAL when args[0] contains invalid exits -Valid bits in args[0] are +Valid bits in args[0] are:: -#define KVM_X86_DISABLE_EXITS_MWAIT (1 << 0) -#define KVM_X86_DISABLE_EXITS_HLT (1 << 1) -#define KVM_X86_DISABLE_EXITS_PAUSE (1 << 2) -#define KVM_X86_DISABLE_EXITS_CSTATE (1 << 3) + #define KVM_X86_DISABLE_EXITS_MWAIT (1 << 0) + #define KVM_X86_DISABLE_EXITS_HLT (1 << 1) + #define KVM_X86_DISABLE_EXITS_PAUSE (1 << 2) + #define KVM_X86_DISABLE_EXITS_CSTATE (1 << 3) Enabling this capability on a VM provides userspace with a way to no longer intercept some instructions for improved latency in some @@ -5087,12 +5631,13 @@ all such vmexits. Do not enable KVM_FEATURE_PV_UNHALT if you disable HLT exits. 7.14 KVM_CAP_S390_HPAGE_1M +-------------------------- -Architectures: s390 -Parameters: none -Returns: 0 on success, -EINVAL if hpage module parameter was not set - or cmma is enabled, or the VM has the KVM_VM_S390_UCONTROL - flag set +:Architectures: s390 +:Parameters: none +:Returns: 0 on success, -EINVAL if hpage module parameter was not set + or cmma is enabled, or the VM has the KVM_VM_S390_UCONTROL + flag set With this capability the KVM support for memory backing with 1m pages through hugetlbfs can be enabled for a VM. After the capability is @@ -5104,20 +5649,22 @@ While it is generally possible to create a huge page backed VM without this capability, the VM will not be able to run. 7.15 KVM_CAP_MSR_PLATFORM_INFO +------------------------------ -Architectures: x86 -Parameters: args[0] whether feature should be enabled or not +:Architectures: x86 +:Parameters: args[0] whether feature should be enabled or not With this capability, a guest may read the MSR_PLATFORM_INFO MSR. Otherwise, a #GP would be raised when the guest tries to access. Currently, this capability does not enable write permissions of this MSR for the guest. 7.16 KVM_CAP_PPC_NESTED_HV +-------------------------- -Architectures: ppc -Parameters: none -Returns: 0 on success, -EINVAL when the implementation doesn't support - nested-HV virtualization. +:Architectures: ppc +:Parameters: none +:Returns: 0 on success, -EINVAL when the implementation doesn't support + nested-HV virtualization. HV-KVM on POWER9 and later systems allows for "nested-HV" virtualization, which provides a way for a guest VM to run guests that @@ -5127,9 +5674,10 @@ the necessary functionality and on the facility being enabled with a kvm-hv module parameter. 7.17 KVM_CAP_EXCEPTION_PAYLOAD +------------------------------ -Architectures: x86 -Parameters: args[0] whether feature should be enabled or not +:Architectures: x86 +:Parameters: args[0] whether feature should be enabled or not With this capability enabled, CR2 will not be modified prior to the emulated VM-exit when L1 intercepts a #PF exception that occurs in @@ -5140,21 +5688,21 @@ L2. As a result, when KVM_GET_VCPU_EVENTS reports a pending #PF (or faulting address (or the new DR6 bits*) will be reported in the exception_payload field. Similarly, when userspace injects a #PF (or #DB) into L2 using KVM_SET_VCPU_EVENTS, it is expected to set -exception.has_payload and to put the faulting address (or the new DR6 -bits*) in the exception_payload field. +exception.has_payload and to put the faulting address - or the new DR6 +bits\ [#]_ - in the exception_payload field. This capability also enables exception.pending in struct kvm_vcpu_events, which allows userspace to distinguish between pending and injected exceptions. -* For the new DR6 bits, note that bit 16 is set iff the #DB exception - will clear DR6.RTM. +.. [#] For the new DR6 bits, note that bit 16 is set iff the #DB exception + will clear DR6.RTM. 7.18 KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 -Architectures: x86, arm, arm64, mips -Parameters: args[0] whether feature should be enabled or not +:Architectures: x86, arm, arm64, mips +:Parameters: args[0] whether feature should be enabled or not With this capability enabled, KVM_GET_DIRTY_LOG will not automatically clear and write-protect all pages that are returned as dirty. @@ -5181,14 +5729,15 @@ KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 signals that those bugs are fixed. Userspace should not try to use KVM_CAP_MANUAL_DIRTY_LOG_PROTECT. 8. Other capabilities. ----------------------- +====================== This section lists capabilities that give information about other features of the KVM implementation. 8.1 KVM_CAP_PPC_HWRNG +--------------------- -Architectures: ppc +:Architectures: ppc This capability, if KVM_CHECK_EXTENSION indicates that it is available, means that that the kernel has an implementation of the @@ -5197,8 +5746,10 @@ If present, the kernel H_RANDOM handler can be enabled for guest use with the KVM_CAP_PPC_ENABLE_HCALL capability. 8.2 KVM_CAP_HYPERV_SYNIC +------------------------ + +:Architectures: x86 -Architectures: x86 This capability, if KVM_CHECK_EXTENSION indicates that it is available, means that that the kernel has an implementation of the Hyper-V Synthetic interrupt controller(SynIC). Hyper-V SynIC is @@ -5210,8 +5761,9 @@ will disable the use of APIC hardware virtualization even if supported by the CPU, as it's incompatible with SynIC auto-EOI behavior. 8.3 KVM_CAP_PPC_RADIX_MMU +------------------------- -Architectures: ppc +:Architectures: ppc This capability, if KVM_CHECK_EXTENSION indicates that it is available, means that that the kernel can support guests using the @@ -5219,8 +5771,9 @@ radix MMU defined in Power ISA V3.00 (as implemented in the POWER9 processor). 8.4 KVM_CAP_PPC_HASH_MMU_V3 +--------------------------- -Architectures: ppc +:Architectures: ppc This capability, if KVM_CHECK_EXTENSION indicates that it is available, means that that the kernel can support guests using the @@ -5228,8 +5781,9 @@ hashed page table MMU defined in Power ISA V3.00 (as implemented in the POWER9 processor), including in-memory segment tables. 8.5 KVM_CAP_MIPS_VZ +------------------- -Architectures: mips +:Architectures: mips This capability, if KVM_CHECK_EXTENSION on the main kvm handle indicates that it is available, means that full hardware assisted virtualization capabilities @@ -5247,16 +5801,19 @@ values (see below). All other values are reserved. This is to allow for the possibility of other hardware assisted virtualization implementations which may be incompatible with the MIPS VZ ASE. - 0: The trap & emulate implementation is in use to run guest code in user +== ========================================================================== + 0 The trap & emulate implementation is in use to run guest code in user mode. Guest virtual memory segments are rearranged to fit the guest in the user mode address space. - 1: The MIPS VZ ASE is in use, providing full hardware assisted + 1 The MIPS VZ ASE is in use, providing full hardware assisted virtualization, including standard guest virtual memory segments. +== ========================================================================== 8.6 KVM_CAP_MIPS_TE +------------------- -Architectures: mips +:Architectures: mips This capability, if KVM_CHECK_EXTENSION on the main kvm handle indicates that it is available, means that the trap & emulate implementation is available to @@ -5268,8 +5825,9 @@ If KVM_CHECK_EXTENSION on a kvm VM handle indicates that this capability is available, it means that the VM is using trap & emulate. 8.7 KVM_CAP_MIPS_64BIT +---------------------- -Architectures: mips +:Architectures: mips This capability indicates the supported architecture type of the guest, i.e. the supported register and address width. @@ -5279,22 +5837,26 @@ kvm VM handle correspond roughly to the CP0_Config.AT register field, and should be checked specifically against known values (see below). All other values are reserved. - 0: MIPS32 or microMIPS32. +== ======================================================================== + 0 MIPS32 or microMIPS32. Both registers and addresses are 32-bits wide. It will only be possible to run 32-bit guest code. - 1: MIPS64 or microMIPS64 with access only to 32-bit compatibility segments. + 1 MIPS64 or microMIPS64 with access only to 32-bit compatibility segments. Registers are 64-bits wide, but addresses are 32-bits wide. 64-bit guest code may run but cannot access MIPS64 memory segments. It will also be possible to run 32-bit guest code. - 2: MIPS64 or microMIPS64 with access to all address segments. + 2 MIPS64 or microMIPS64 with access to all address segments. Both registers and addresses are 64-bits wide. It will be possible to run 64-bit or 32-bit guest code. +== ======================================================================== 8.9 KVM_CAP_ARM_USER_IRQ +------------------------ + +:Architectures: arm, arm64 -Architectures: arm, arm64 This capability, if KVM_CHECK_EXTENSION indicates that it is available, means that if userspace creates a VM without an in-kernel interrupt controller, it will be notified of changes to the output level of in-kernel emulated devices, @@ -5321,7 +5883,7 @@ If KVM_CAP_ARM_USER_IRQ is supported, the KVM_CHECK_EXTENSION ioctl returns a number larger than 0 indicating the version of this capability is implemented and thereby which bits in in run->s.regs.device_irq_level can signal values. -Currently the following bits are defined for the device_irq_level bitmap: +Currently the following bits are defined for the device_irq_level bitmap:: KVM_CAP_ARM_USER_IRQ >= 1: @@ -5334,8 +5896,9 @@ indicated by returning a higher number from KVM_CHECK_EXTENSION and will be listed above. 8.10 KVM_CAP_PPC_SMT_POSSIBLE +----------------------------- -Architectures: ppc +:Architectures: ppc Querying this capability returns a bitmap indicating the possible virtual SMT modes that can be set using KVM_CAP_PPC_SMT. If bit N @@ -5343,8 +5906,9 @@ virtual SMT modes that can be set using KVM_CAP_PPC_SMT. If bit N available. 8.11 KVM_CAP_HYPERV_SYNIC2 +-------------------------- -Architectures: x86 +:Architectures: x86 This capability enables a newer version of Hyper-V Synthetic interrupt controller (SynIC). The only difference with KVM_CAP_HYPERV_SYNIC is that KVM @@ -5352,8 +5916,9 @@ doesn't clear SynIC message and event flags pages when they are enabled by writing to the respective MSRs. 8.12 KVM_CAP_HYPERV_VP_INDEX +---------------------------- -Architectures: x86 +:Architectures: x86 This capability indicates that userspace can load HV_X64_MSR_VP_INDEX msr. Its value is used to denote the target vcpu for a SynIC interrupt. For @@ -5361,47 +5926,53 @@ compatibilty, KVM initializes this msr to KVM's internal vcpu index. When this capability is absent, userspace can still query this msr's value. 8.13 KVM_CAP_S390_AIS_MIGRATION +------------------------------- -Architectures: s390 -Parameters: none +:Architectures: s390 +:Parameters: none This capability indicates if the flic device will be able to get/set the AIS states for migration via the KVM_DEV_FLIC_AISM_ALL attribute and allows to discover this without having to create a flic device. 8.14 KVM_CAP_S390_PSW +--------------------- -Architectures: s390 +:Architectures: s390 This capability indicates that the PSW is exposed via the kvm_run structure. 8.15 KVM_CAP_S390_GMAP +---------------------- -Architectures: s390 +:Architectures: s390 This capability indicates that the user space memory used as guest mapping can be anywhere in the user memory address space, as long as the memory slots are aligned and sized to a segment (1MB) boundary. 8.16 KVM_CAP_S390_COW +--------------------- -Architectures: s390 +:Architectures: s390 This capability indicates that the user space memory used as guest mapping can use copy-on-write semantics as well as dirty pages tracking via read-only page tables. 8.17 KVM_CAP_S390_BPB +--------------------- -Architectures: s390 +:Architectures: s390 This capability indicates that kvm will implement the interfaces to handle reset, migration and nested KVM for branch prediction blocking. The stfle facility 82 should not be provided to the guest without this capability. 8.18 KVM_CAP_HYPERV_TLBFLUSH +---------------------------- -Architectures: x86 +:Architectures: x86 This capability indicates that KVM supports paravirtualized Hyper-V TLB Flush hypercalls: @@ -5409,8 +5980,9 @@ HvFlushVirtualAddressSpace, HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressList, HvFlushVirtualAddressListEx. 8.19 KVM_CAP_ARM_INJECT_SERROR_ESR +---------------------------------- -Architectures: arm, arm64 +:Architectures: arm, arm64 This capability indicates that userspace can specify (via the KVM_SET_VCPU_EVENTS ioctl) the syndrome value reported to the guest when it @@ -5421,16 +5993,20 @@ CPU when the exception is taken. If this virtual SError is taken to EL1 using AArch64, this value will be reported in the ISS field of ESR_ELx. See KVM_CAP_VCPU_EVENTS for more details. + 8.20 KVM_CAP_HYPERV_SEND_IPI +---------------------------- -Architectures: x86 +:Architectures: x86 This capability indicates that KVM supports paravirtualized Hyper-V IPI send hypercalls: HvCallSendSyntheticClusterIpi, HvCallSendSyntheticClusterIpiEx. + 8.21 KVM_CAP_HYPERV_DIRECT_TLBFLUSH +----------------------------------- -Architecture: x86 +:Architecture: x86 This capability indicates that KVM running on top of Hyper-V hypervisor enables Direct TLB flush for its guests meaning that TLB flush diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index 24d1076ec680..6fe79185b9bc 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -7,6 +7,7 @@ KVM .. toctree:: :maxdepth: 2 + api amd-memory-encryption cpuid halt-polling From patchwork Mon Feb 10 06:02:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372581 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2D74F17F0 for ; Mon, 10 Feb 2020 06:04:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C1C82465B for ; Mon, 10 Feb 2020 06:04:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314641; bh=kza+nIaub/EO+u1abwbBpyZvce4UHjBfCCjb8bXTkqw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=sxtUVIuPsh3pKSB5KOrBhnNnWZN4wo/jQDgsZah+zSOV7NPvN3nI+3bJcj/UTGc6x T8aBVTbJSUI+zWme2XvE72N7CoJ5RWiN3leG3yTc/dKTTJ6vj4Zc+XB+5VUyeGVL+Q Yca1O+AdGBZkhszjF1Ty24lNrucAKc+IE2GE9nhw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727747AbgBJGDp (ORCPT ); Mon, 10 Feb 2020 01:03:45 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36330 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727508AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=p2YhU3jfC3+pZD58yyGjx9QrnEOyUsPJA0xSIIWllRk=; b=c9V4kU8saJN9Y9mvu0C3MA0dxc 2rNYXuRxjKsOO1gQZkbQyxByF2w2v6RHgT15ytnblAeVKkxTVLq62d49oRnZuR0PrGF8St9nlp+g8 bsAmfV0ch6BoCJVR6v+G7YPb6f6IWoKonrdKBGfbGrUpAOC4tvhjHjVEDKkwQhCciBlrgprgKp432 J07yMjFfnEWRAC4/SMnjBSHeqmTTvIN4hJeQ2JTNP+LeFzWs9JGrjW0H41dBcXhAo7W+sy38LO6kX ojRYybOh2CCo52dlXCWD9zySo1lpkMhLvZYFv2aX9WVf0JBTNLJeiPEumzHtcP6mq3/wufxissrCS hzjIDpeA==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Ts-2b; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2W0-Cs; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 18/28] docs: kvm: convert arm/hyp-abi.txt to ReST Date: Mon, 10 Feb 2020 07:02:56 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Add proper markups for titles; - Adjust whitespaces and blank lines to match ReST needs; - Mark literal blocks as such. Signed-off-by: Mauro Carvalho Chehab --- .../virt/kvm/arm/{hyp-abi.txt => hyp-abi.rst} | 28 +++++++++++++------ Documentation/virt/kvm/arm/index.rst | 1 + 2 files changed, 20 insertions(+), 9 deletions(-) rename Documentation/virt/kvm/arm/{hyp-abi.txt => hyp-abi.rst} (79%) diff --git a/Documentation/virt/kvm/arm/hyp-abi.txt b/Documentation/virt/kvm/arm/hyp-abi.rst similarity index 79% rename from Documentation/virt/kvm/arm/hyp-abi.txt rename to Documentation/virt/kvm/arm/hyp-abi.rst index a20a0bee268d..d1fc27d848e9 100644 --- a/Documentation/virt/kvm/arm/hyp-abi.txt +++ b/Documentation/virt/kvm/arm/hyp-abi.rst @@ -1,4 +1,8 @@ -* Internal ABI between the kernel and HYP +.. SPDX-License-Identifier: GPL-2.0 + +======================================= +Internal ABI between the kernel and HYP +======================================= This file documents the interaction between the Linux kernel and the hypervisor layer when running Linux as a hypervisor (for example @@ -19,25 +23,31 @@ and only act on individual CPUs. Unless specified otherwise, any built-in hypervisor must implement these functions (see arch/arm{,64}/include/asm/virt.h): -* r0/x0 = HVC_SET_VECTORS - r1/x1 = vectors +* :: + + r0/x0 = HVC_SET_VECTORS + r1/x1 = vectors Set HVBAR/VBAR_EL2 to 'vectors' to enable a hypervisor. 'vectors' must be a physical address, and respect the alignment requirements of the architecture. Only implemented by the initial stubs, not by Linux hypervisors. -* r0/x0 = HVC_RESET_VECTORS +* :: + + r0/x0 = HVC_RESET_VECTORS Turn HYP/EL2 MMU off, and reset HVBAR/VBAR_EL2 to the initials stubs' exception vector value. This effectively disables an existing hypervisor. -* r0/x0 = HVC_SOFT_RESTART - r1/x1 = restart address - x2 = x0's value when entering the next payload (arm64) - x3 = x1's value when entering the next payload (arm64) - x4 = x2's value when entering the next payload (arm64) +* :: + + r0/x0 = HVC_SOFT_RESTART + r1/x1 = restart address + x2 = x0's value when entering the next payload (arm64) + x3 = x1's value when entering the next payload (arm64) + x4 = x2's value when entering the next payload (arm64) Mask all exceptions, disable the MMU, move the arguments into place (arm64 only), and jump to the restart address while at HYP/EL2. This diff --git a/Documentation/virt/kvm/arm/index.rst b/Documentation/virt/kvm/arm/index.rst index e039d9b1e076..134fa5fa77e5 100644 --- a/Documentation/virt/kvm/arm/index.rst +++ b/Documentation/virt/kvm/arm/index.rst @@ -7,4 +7,5 @@ ARM .. toctree:: :maxdepth: 2 + hyp-abi pvtime From patchwork Mon Feb 10 06:02:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372585 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A8C7717F0 for ; Mon, 10 Feb 2020 06:04:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 872D224656 for ; Mon, 10 Feb 2020 06:04:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314643; bh=P4LnyLZ65S8o8II+eEhSbCd4kvDsh7wLEYquFYAmk84=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0q+HloVxXdQXbGfh4aJ9/dqVksuyH4Muc8Cqq7ZZ0aGbiXJqJdQ4lULavO/f/Asu5 OVavQXvzjkQChJ1gzkD4GKUZNXi5rTNkMyePMdsI000QmGyY5WwyoWIw940p5BdjBO JRmNGj+KLlWQx7d36GLD/f3uBHLYpJUYM55Zmf/s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727731AbgBJGEC (ORCPT ); Mon, 10 Feb 2020 01:04:02 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36326 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727507AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=CzvFNiYCk6rJkYqH7EYJZ58H6P3c8r/RaU40sj/CJoI=; b=jiQdTZs1FzJ+u4sw9+hMXi1vts 3xjm7DpEsDfx6YZ2JxgW4RwkKuLDQPo9nw9lHJLuq/ods7m1Rox/qZkbvlVGUAR2scP/EcWNQMc2L +KgY/oDtPSyg0NvSN4Rfgay8B9ikbgajAtyxGgEYQAbQHu7vzD4XAtUQJId7odLXlaoUc8R5XASVI ouVT8ydpv1Y93WdffHOTMkrzshHn7XLlKc4eSJBSR2KpgP9QDcYFddobNHi3UEm6lba05Xst1ARiy rPSfdKqcqpXLBt6gkOQbEnXxkHwpvcKRwDVgg+fquhw3auEVuU7ZGboRdwhHZ5VWH+fM8s9q6tO5q mzcVBOCg==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Tt-39; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2W5-Dk; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 19/28] docs: kvm: arm/psci.txt: convert to ReST Date: Mon, 10 Feb 2020 07:02:57 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Add a title for the document; - Adjust whitespaces for it to be properly formatted after parsed. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/arm/index.rst | 1 + .../virt/kvm/arm/{psci.txt => psci.rst} | 46 +++++++++++++------ 2 files changed, 32 insertions(+), 15 deletions(-) rename Documentation/virt/kvm/arm/{psci.txt => psci.rst} (60%) diff --git a/Documentation/virt/kvm/arm/index.rst b/Documentation/virt/kvm/arm/index.rst index 134fa5fa77e5..3e2b2aba90fc 100644 --- a/Documentation/virt/kvm/arm/index.rst +++ b/Documentation/virt/kvm/arm/index.rst @@ -8,4 +8,5 @@ ARM :maxdepth: 2 hyp-abi + psci pvtime diff --git a/Documentation/virt/kvm/arm/psci.txt b/Documentation/virt/kvm/arm/psci.rst similarity index 60% rename from Documentation/virt/kvm/arm/psci.txt rename to Documentation/virt/kvm/arm/psci.rst index 559586fc9d37..d52c2e83b5b8 100644 --- a/Documentation/virt/kvm/arm/psci.txt +++ b/Documentation/virt/kvm/arm/psci.rst @@ -1,3 +1,9 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================================= +Power State Coordination Interface (PSCI) +========================================= + KVM implements the PSCI (Power State Coordination Interface) specification in order to provide services such as CPU on/off, reset and power-off to the guest. @@ -30,32 +36,42 @@ The following register is defined: - Affects the whole VM (even if the register view is per-vcpu) * KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1: - Holds the state of the firmware support to mitigate CVE-2017-5715, as - offered by KVM to the guest via a HVC call. The workaround is described - under SMCCC_ARCH_WORKAROUND_1 in [1]. + Holds the state of the firmware support to mitigate CVE-2017-5715, as + offered by KVM to the guest via a HVC call. The workaround is described + under SMCCC_ARCH_WORKAROUND_1 in [1]. + Accepted values are: - KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL: KVM does not offer + + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL: + KVM does not offer firmware support for the workaround. The mitigation status for the guest is unknown. - KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL: The workaround HVC call is + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL: + The workaround HVC call is available to the guest and required for the mitigation. - KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED: The workaround HVC call + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED: + The workaround HVC call is available to the guest, but it is not needed on this VCPU. * KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2: - Holds the state of the firmware support to mitigate CVE-2018-3639, as - offered by KVM to the guest via a HVC call. The workaround is described - under SMCCC_ARCH_WORKAROUND_2 in [1]. + Holds the state of the firmware support to mitigate CVE-2018-3639, as + offered by KVM to the guest via a HVC call. The workaround is described + under SMCCC_ARCH_WORKAROUND_2 in [1]_. + Accepted values are: - KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL: A workaround is not + + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL: + A workaround is not available. KVM does not offer firmware support for the workaround. - KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN: The workaround state is + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN: + The workaround state is unknown. KVM does not offer firmware support for the workaround. - KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL: The workaround is available, + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL: + The workaround is available, and can be disabled by a vCPU. If KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED is set, it is active for this vCPU. - KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED: The workaround is - always active on this vCPU or it is not needed. + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED: + The workaround is always active on this vCPU or it is not needed. -[1] https://developer.arm.com/-/media/developer/pdf/ARM_DEN_0070A_Firmware_interfaces_for_mitigating_CVE-2017-5715.pdf +.. [1] https://developer.arm.com/-/media/developer/pdf/ARM_DEN_0070A_Firmware_interfaces_for_mitigating_CVE-2017-5715.pdf From patchwork Mon Feb 10 06:02:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372499 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3142E92A for ; Mon, 10 Feb 2020 06:03:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0723124687 for ; Mon, 10 Feb 2020 06:03:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314595; bh=JKAs/yk3oebL2JJu+bJ0fqXfQJ/mghBaRgtB5NbwWAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=J+pEiuFiO+PdOm6NrAd8O6maovqwbbrDIZTrqR+o32zC9etXNLTF8p5YsuI++hA95 XtscJ0LEyPFQU2lHIUZ4eLVI9/g2lG4N6H0iu7ev/o/0FNc0DNOzlV0IsUKqEG/tSc /00W+4LnyaSuw50h1kPR+VqA8RIthrwUKQcsE6ws= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727597AbgBJGDO (ORCPT ); Mon, 10 Feb 2020 01:03:14 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36352 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727530AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=PCOYorxp5B66Bz7dLpdri3RiULamlM3oIiU8p4XbyRM=; b=CwID2ypUiVS4KSCL4PaxfFZG8z PvMuFFKerubiFW4Gfiu0rdhLZ5JqtvUzsmOzivZrLW9IapSUfKzHi5djXqYEkrAxGP8maRzVhAHYW b3ao5ZqbLQ+0nZKDVfgoshwwz9+If0pGQKT31lEOKPyY9xrt3IIrH07fG9FVci1bJr/BkQJ4WDRpK Tv3xCjD0KItoP/Ao6tfwFmDO+weMvKdpgCnTqUzFcEU96yfl1dNhX/qPysBpxpl71Y0wq/6RvJ630 Tbml4Ro6Su8BoUbqZyJwVJpgEVvfLPlG+4XPupJ3Khy6kyjD5XgHL3MhCP6EVXpSPgZyY2qSReY5O BxFYx4OQ==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Tu-5J; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2WA-El; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 20/28] docs: kvm: Convert hypercalls.txt to ReST format Date: Mon, 10 Feb 2020 07:02:58 +0100 Message-Id: <48904ada2b9d61f513fc081358cbc4406926c999.1581314317.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use document title and chapter markups; - Convert tables; - Add markups for literal blocks; - use :field: for field descriptions; - Add blank lines and adjust indentation Signed-off-by: Mauro Carvalho Chehab --- .../kvm/{hypercalls.txt => hypercalls.rst} | 129 ++++++++++-------- Documentation/virt/kvm/index.rst | 2 + 2 files changed, 75 insertions(+), 56 deletions(-) rename Documentation/virt/kvm/{hypercalls.txt => hypercalls.rst} (55%) diff --git a/Documentation/virt/kvm/hypercalls.txt b/Documentation/virt/kvm/hypercalls.rst similarity index 55% rename from Documentation/virt/kvm/hypercalls.txt rename to Documentation/virt/kvm/hypercalls.rst index 5f6d291bd004..dbaf207e560d 100644 --- a/Documentation/virt/kvm/hypercalls.txt +++ b/Documentation/virt/kvm/hypercalls.rst @@ -1,5 +1,9 @@ -Linux KVM Hypercall: +.. SPDX-License-Identifier: GPL-2.0 + =================== +Linux KVM Hypercall +=================== + X86: KVM Hypercalls have a three-byte sequence of either the vmcall or the vmmcall instruction. The hypervisor can replace it with instructions that are @@ -20,7 +24,7 @@ S390: For further information on the S390 diagnose call as supported by KVM, refer to Documentation/virt/kvm/s390-diag.txt. - PowerPC: +PowerPC: It uses R3-R10 and hypercall number in R11. R4-R11 are used as output registers. Return value is placed in R3. @@ -34,7 +38,8 @@ MIPS: the return value is placed in $2 (v0). KVM Hypercalls Documentation -=========================== +============================ + The template for each hypercall is: 1. Hypercall name. 2. Architecture(s) @@ -43,56 +48,64 @@ The template for each hypercall is: 1. KVM_HC_VAPIC_POLL_IRQ ------------------------ -Architecture: x86 -Status: active -Purpose: Trigger guest exit so that the host can check for pending -interrupts on reentry. + +:Architecture: x86 +:Status: active +:Purpose: Trigger guest exit so that the host can check for pending + interrupts on reentry. 2. KVM_HC_MMU_OP ------------------------- -Architecture: x86 -Status: deprecated. -Purpose: Support MMU operations such as writing to PTE, -flushing TLB, release PT. +---------------- + +:Architecture: x86 +:Status: deprecated. +:Purpose: Support MMU operations such as writing to PTE, + flushing TLB, release PT. 3. KVM_HC_FEATURES ------------------------- -Architecture: PPC -Status: active -Purpose: Expose hypercall availability to the guest. On x86 platforms, cpuid -used to enumerate which hypercalls are available. On PPC, either device tree -based lookup ( which is also what EPAPR dictates) OR KVM specific enumeration -mechanism (which is this hypercall) can be used. +------------------ + +:Architecture: PPC +:Status: active +:Purpose: Expose hypercall availability to the guest. On x86 platforms, cpuid + used to enumerate which hypercalls are available. On PPC, either + device tree based lookup ( which is also what EPAPR dictates) + OR KVM specific enumeration mechanism (which is this hypercall) + can be used. 4. KVM_HC_PPC_MAP_MAGIC_PAGE ------------------------- -Architecture: PPC -Status: active -Purpose: To enable communication between the hypervisor and guest there is a -shared page that contains parts of supervisor visible register state. -The guest can map this shared page to access its supervisor register through -memory using this hypercall. +---------------------------- + +:Architecture: PPC +:Status: active +:Purpose: To enable communication between the hypervisor and guest there is a + shared page that contains parts of supervisor visible register state. + The guest can map this shared page to access its supervisor register + through memory using this hypercall. 5. KVM_HC_KICK_CPU ------------------------- -Architecture: x86 -Status: active -Purpose: Hypercall used to wakeup a vcpu from HLT state -Usage example : A vcpu of a paravirtualized guest that is busywaiting in guest -kernel mode for an event to occur (ex: a spinlock to become available) can -execute HLT instruction once it has busy-waited for more than a threshold -time-interval. Execution of HLT instruction would cause the hypervisor to put -the vcpu to sleep until occurrence of an appropriate event. Another vcpu of the -same guest can wakeup the sleeping vcpu by issuing KVM_HC_KICK_CPU hypercall, -specifying APIC ID (a1) of the vcpu to be woken up. An additional argument (a0) -is used in the hypercall for future use. +------------------ + +:Architecture: x86 +:Status: active +:Purpose: Hypercall used to wakeup a vcpu from HLT state +:Usage example: + A vcpu of a paravirtualized guest that is busywaiting in guest + kernel mode for an event to occur (ex: a spinlock to become available) can + execute HLT instruction once it has busy-waited for more than a threshold + time-interval. Execution of HLT instruction would cause the hypervisor to put + the vcpu to sleep until occurrence of an appropriate event. Another vcpu of the + same guest can wakeup the sleeping vcpu by issuing KVM_HC_KICK_CPU hypercall, + specifying APIC ID (a1) of the vcpu to be woken up. An additional argument (a0) + is used in the hypercall for future use. 6. KVM_HC_CLOCK_PAIRING ------------------------- -Architecture: x86 -Status: active -Purpose: Hypercall used to synchronize host and guest clocks. +----------------------- +:Architecture: x86 +:Status: active +:Purpose: Hypercall used to synchronize host and guest clocks. + Usage: a0: guest physical address where host copies @@ -101,6 +114,8 @@ a0: guest physical address where host copies a1: clock_type, ATM only KVM_CLOCK_PAIRING_WALLCLOCK (0) is supported (corresponding to the host's CLOCK_REALTIME clock). + :: + struct kvm_clock_pairing { __s64 sec; __s64 nsec; @@ -123,15 +138,16 @@ Returns KVM_EOPNOTSUPP if the host does not use TSC clocksource, or if clock type is different than KVM_CLOCK_PAIRING_WALLCLOCK. 6. KVM_HC_SEND_IPI ------------------------- -Architecture: x86 -Status: active -Purpose: Send IPIs to multiple vCPUs. +------------------ -a0: lower part of the bitmap of destination APIC IDs -a1: higher part of the bitmap of destination APIC IDs -a2: the lowest APIC ID in bitmap -a3: APIC ICR +:Architecture: x86 +:Status: active +:Purpose: Send IPIs to multiple vCPUs. + +- a0: lower part of the bitmap of destination APIC IDs +- a1: higher part of the bitmap of destination APIC IDs +- a2: the lowest APIC ID in bitmap +- a3: APIC ICR The hypercall lets a guest send multicast IPIs, with at most 128 128 destinations per hypercall in 64-bit mode and 64 vCPUs per @@ -143,12 +159,13 @@ corresponds to the APIC ID a2+1, and so on. Returns the number of CPUs to which the IPIs were delivered successfully. 7. KVM_HC_SCHED_YIELD ------------------------- -Architecture: x86 -Status: active -Purpose: Hypercall used to yield if the IPI target vCPU is preempted +--------------------- + +:Architecture: x86 +:Status: active +:Purpose: Hypercall used to yield if the IPI target vCPU is preempted a0: destination APIC ID -Usage example: When sending a call-function IPI-many to vCPUs, yield if -any of the IPI target vCPUs was preempted. +:Usage example: When sending a call-function IPI-many to vCPUs, yield if + any of the IPI target vCPUs was preempted. diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index 6fe79185b9bc..ac83bc588f7e 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -11,8 +11,10 @@ KVM amd-memory-encryption cpuid halt-polling + hypercalls msr vcpu-requests arm/index + devices/index From patchwork Mon Feb 10 06:02:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372547 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E8B3117F0 for ; Mon, 10 Feb 2020 06:03:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AA51E2467E for ; Mon, 10 Feb 2020 06:03:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314618; bh=bZyEOYXguD56UXSgqEeAo7sN4G1YPuBDNC7Fj9uE8SI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jsWmXfO3kmGQONKbXuA2KDtTjSLsE2KJOlS6BNgHLZM/4jqhHRfpV3dhvyVkUpnPK hZdOBuR5es2/Vwf9vs8ZxHTYEY/OCnwhq3j/OK0tJeeqvkRgB4uZXhiW+SxFbRHHzQ mDSu+2smUtcEzs1c7z0jABpLhHxH5VTXy4LrEm28= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727686AbgBJGDd (ORCPT ); Mon, 10 Feb 2020 01:03:33 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36414 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727555AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=dJiiHgPJv+FD5Heh47DYQAiy3+LAt/Pk2+RFmbNpcJg=; b=LUnK2hcdRKw81wCCQc4MDrzvuU JnZVWjju4vT6f3oJZajh8CqV6ouPhp4FlwBXk5BQYWz37j2Y2MuyjLnIMZ4QRHlju3rVM7Uc7RQxX uH97+T3jWlzI2eU2u/LVuh3cJU3Mz9d0xS12ZoA9MPYfEztkS8lURTyyneLjsfuPCURakhpYVkcKs 0r/DO15ZXZBapYJvqXP5hWgD4mFT4yER6b7zqWwO97cmwg7EaioNjA4wD6UbdDSd+TkRVxp1cw/y9 big4LTHxs1BbSPMRcLgV09GcG7+1YKFF1OlBV8cyDEJVzevRLS1Ztgk1B8g2xdvySmsqoXm95/M4g Ho5r4o5w==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Tv-7a; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2WF-GU; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 21/28] docs: kvm: Convert locking.txt to ReST format Date: Mon, 10 Feb 2020 07:02:59 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use document title and chapter markups; - Add markups for literal blocks; - use :field: for field descriptions; - Add blank lines and adjust indentation. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/index.rst | 1 + Documentation/virt/kvm/locking.rst | 243 +++++++++++++++++++++++++++++ Documentation/virt/kvm/locking.txt | 215 ------------------------- 3 files changed, 244 insertions(+), 215 deletions(-) create mode 100644 Documentation/virt/kvm/locking.rst delete mode 100644 Documentation/virt/kvm/locking.txt diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index ac83bc588f7e..9be8f53b729d 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -12,6 +12,7 @@ KVM cpuid halt-polling hypercalls + locking msr vcpu-requests diff --git a/Documentation/virt/kvm/locking.rst b/Documentation/virt/kvm/locking.rst new file mode 100644 index 000000000000..c02291beac3f --- /dev/null +++ b/Documentation/virt/kvm/locking.rst @@ -0,0 +1,243 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================= +KVM Lock Overview +================= + +1. Acquisition Orders +--------------------- + +The acquisition orders for mutexes are as follows: + +- kvm->lock is taken outside vcpu->mutex + +- kvm->lock is taken outside kvm->slots_lock and kvm->irq_lock + +- kvm->slots_lock is taken outside kvm->irq_lock, though acquiring + them together is quite rare. + +On x86, vcpu->mutex is taken outside kvm->arch.hyperv.hv_lock. + +Everything else is a leaf: no other lock is taken inside the critical +sections. + +2. Exception +------------ + +Fast page fault: + +Fast page fault is the fast path which fixes the guest page fault out of +the mmu-lock on x86. Currently, the page fault can be fast in one of the +following two cases: + +1. Access Tracking: The SPTE is not present, but it is marked for access + tracking i.e. the SPTE_SPECIAL_MASK is set. That means we need to + restore the saved R/X bits. This is described in more detail later below. + +2. Write-Protection: The SPTE is present and the fault is + caused by write-protect. That means we just need to change the W bit of + the spte. + +What we use to avoid all the race is the SPTE_HOST_WRITEABLE bit and +SPTE_MMU_WRITEABLE bit on the spte: + +- SPTE_HOST_WRITEABLE means the gfn is writable on host. +- SPTE_MMU_WRITEABLE means the gfn is writable on mmu. The bit is set when + the gfn is writable on guest mmu and it is not write-protected by shadow + page write-protection. + +On fast page fault path, we will use cmpxchg to atomically set the spte W +bit if spte.SPTE_HOST_WRITEABLE = 1 and spte.SPTE_WRITE_PROTECT = 1, or +restore the saved R/X bits if VMX_EPT_TRACK_ACCESS mask is set, or both. This +is safe because whenever changing these bits can be detected by cmpxchg. + +But we need carefully check these cases: + +1) The mapping from gfn to pfn + +The mapping from gfn to pfn may be changed since we can only ensure the pfn +is not changed during cmpxchg. This is a ABA problem, for example, below case +will happen: + ++------------------------------------------------------------------------+ +| At the beginning:: | +| | +| gpte = gfn1 | +| gfn1 is mapped to pfn1 on host | +| spte is the shadow page table entry corresponding with gpte and | +| spte = pfn1 | ++------------------------------------------------------------------------+ +| On fast page fault path: | ++------------------------------------+-----------------------------------+ +| CPU 0: | CPU 1: | ++------------------------------------+-----------------------------------+ +| :: | | +| | | +| old_spte = *spte; | | ++------------------------------------+-----------------------------------+ +| | pfn1 is swapped out:: | +| | | +| | spte = 0; | +| | | +| | pfn1 is re-alloced for gfn2. | +| | | +| | gpte is changed to point to | +| | gfn2 by the guest:: | +| | | +| | spte = pfn1; | ++------------------------------------+-----------------------------------+ +| :: | +| | +| if (cmpxchg(spte, old_spte, old_spte+W) | +| mark_page_dirty(vcpu->kvm, gfn1) | +| OOPS!!! | ++------------------------------------------------------------------------+ + +We dirty-log for gfn1, that means gfn2 is lost in dirty-bitmap. + +For direct sp, we can easily avoid it since the spte of direct sp is fixed +to gfn. For indirect sp, before we do cmpxchg, we call gfn_to_pfn_atomic() +to pin gfn to pfn, because after gfn_to_pfn_atomic(): + +- We have held the refcount of pfn that means the pfn can not be freed and + be reused for another gfn. +- The pfn is writable that means it can not be shared between different gfns + by KSM. + +Then, we can ensure the dirty bitmaps is correctly set for a gfn. + +Currently, to simplify the whole things, we disable fast page fault for +indirect shadow page. + +2) Dirty bit tracking + +In the origin code, the spte can be fast updated (non-atomically) if the +spte is read-only and the Accessed bit has already been set since the +Accessed bit and Dirty bit can not be lost. + +But it is not true after fast page fault since the spte can be marked +writable between reading spte and updating spte. Like below case: + ++------------------------------------------------------------------------+ +| At the beginning:: | +| | +| spte.W = 0 | +| spte.Accessed = 1 | ++------------------------------------+-----------------------------------+ +| CPU 0: | CPU 1: | ++------------------------------------+-----------------------------------+ +| In mmu_spte_clear_track_bits():: | | +| | | +| old_spte = *spte; | | +| | | +| | | +| /* 'if' condition is satisfied. */| | +| if (old_spte.Accessed == 1 && | | +| old_spte.W == 0) | | +| spte = 0ull; | | ++------------------------------------+-----------------------------------+ +| | on fast page fault path:: | +| | | +| | spte.W = 1 | +| | | +| | memory write on the spte:: | +| | | +| | spte.Dirty = 1 | ++------------------------------------+-----------------------------------+ +| :: | | +| | | +| else | | +| old_spte = xchg(spte, 0ull) | | +| if (old_spte.Accessed == 1) | | +| kvm_set_pfn_accessed(spte.pfn);| | +| if (old_spte.Dirty == 1) | | +| kvm_set_pfn_dirty(spte.pfn); | | +| OOPS!!! | | ++------------------------------------+-----------------------------------+ + +The Dirty bit is lost in this case. + +In order to avoid this kind of issue, we always treat the spte as "volatile" +if it can be updated out of mmu-lock, see spte_has_volatile_bits(), it means, +the spte is always atomically updated in this case. + +3) flush tlbs due to spte updated + +If the spte is updated from writable to readonly, we should flush all TLBs, +otherwise rmap_write_protect will find a read-only spte, even though the +writable spte might be cached on a CPU's TLB. + +As mentioned before, the spte can be updated to writable out of mmu-lock on +fast page fault path, in order to easily audit the path, we see if TLBs need +be flushed caused by this reason in mmu_spte_update() since this is a common +function to update spte (present -> present). + +Since the spte is "volatile" if it can be updated out of mmu-lock, we always +atomically update the spte, the race caused by fast page fault can be avoided, +See the comments in spte_has_volatile_bits() and mmu_spte_update(). + +Lockless Access Tracking: + +This is used for Intel CPUs that are using EPT but do not support the EPT A/D +bits. In this case, when the KVM MMU notifier is called to track accesses to a +page (via kvm_mmu_notifier_clear_flush_young), it marks the PTE as not-present +by clearing the RWX bits in the PTE and storing the original R & X bits in +some unused/ignored bits. In addition, the SPTE_SPECIAL_MASK is also set on the +PTE (using the ignored bit 62). When the VM tries to access the page later on, +a fault is generated and the fast page fault mechanism described above is used +to atomically restore the PTE to a Present state. The W bit is not saved when +the PTE is marked for access tracking and during restoration to the Present +state, the W bit is set depending on whether or not it was a write access. If +it wasn't, then the W bit will remain clear until a write access happens, at +which time it will be set using the Dirty tracking mechanism described above. + +3. Reference +------------ + +:Name: kvm_lock +:Type: mutex +:Arch: any +:Protects: - vm_list + +:Name: kvm_count_lock +:Type: raw_spinlock_t +:Arch: any +:Protects: - hardware virtualization enable/disable +:Comment: 'raw' because hardware enabling/disabling must be atomic /wrt + migration. + +:Name: kvm_arch::tsc_write_lock +:Type: raw_spinlock +:Arch: x86 +:Protects: - kvm_arch::{last_tsc_write,last_tsc_nsec,last_tsc_offset} + - tsc offset in vmcb +:Comment: 'raw' because updating the tsc offsets must not be preempted. + +:Name: kvm->mmu_lock +:Type: spinlock_t +:Arch: any +:Protects: -shadow page/shadow tlb entry +:Comment: it is a spinlock since it is used in mmu notifier. + +:Name: kvm->srcu +:Type: srcu lock +:Arch: any +:Protects: - kvm->memslots + - kvm->buses +:Comment: The srcu read lock must be held while accessing memslots (e.g. + when using gfn_to_* functions) and while accessing in-kernel + MMIO/PIO address->device structure mapping (kvm->buses). + The srcu index can be stored in kvm_vcpu->srcu_idx per vcpu + if it is needed by multiple functions. + +:Name: blocked_vcpu_on_cpu_lock +:Type: spinlock_t +:Arch: x86 +:Protects: blocked_vcpu_on_cpu +:Comment: This is a per-CPU lock and it is used for VT-d posted-interrupts. + When VT-d posted-interrupts is supported and the VM has assigned + devices, we put the blocked vCPU on the list blocked_vcpu_on_cpu + protected by blocked_vcpu_on_cpu_lock, when VT-d hardware issues + wakeup notification event since external interrupts from the + assigned devices happens, we will find the vCPU on the list to + wakeup. diff --git a/Documentation/virt/kvm/locking.txt b/Documentation/virt/kvm/locking.txt deleted file mode 100644 index 635cd6eaf714..000000000000 --- a/Documentation/virt/kvm/locking.txt +++ /dev/null @@ -1,215 +0,0 @@ -KVM Lock Overview -================= - -1. Acquisition Orders ---------------------- - -The acquisition orders for mutexes are as follows: - -- kvm->lock is taken outside vcpu->mutex - -- kvm->lock is taken outside kvm->slots_lock and kvm->irq_lock - -- kvm->slots_lock is taken outside kvm->irq_lock, though acquiring - them together is quite rare. - -On x86, vcpu->mutex is taken outside kvm->arch.hyperv.hv_lock. - -Everything else is a leaf: no other lock is taken inside the critical -sections. - -2: Exception ------------- - -Fast page fault: - -Fast page fault is the fast path which fixes the guest page fault out of -the mmu-lock on x86. Currently, the page fault can be fast in one of the -following two cases: - -1. Access Tracking: The SPTE is not present, but it is marked for access -tracking i.e. the SPTE_SPECIAL_MASK is set. That means we need to -restore the saved R/X bits. This is described in more detail later below. - -2. Write-Protection: The SPTE is present and the fault is -caused by write-protect. That means we just need to change the W bit of the -spte. - -What we use to avoid all the race is the SPTE_HOST_WRITEABLE bit and -SPTE_MMU_WRITEABLE bit on the spte: -- SPTE_HOST_WRITEABLE means the gfn is writable on host. -- SPTE_MMU_WRITEABLE means the gfn is writable on mmu. The bit is set when - the gfn is writable on guest mmu and it is not write-protected by shadow - page write-protection. - -On fast page fault path, we will use cmpxchg to atomically set the spte W -bit if spte.SPTE_HOST_WRITEABLE = 1 and spte.SPTE_WRITE_PROTECT = 1, or -restore the saved R/X bits if VMX_EPT_TRACK_ACCESS mask is set, or both. This -is safe because whenever changing these bits can be detected by cmpxchg. - -But we need carefully check these cases: -1): The mapping from gfn to pfn -The mapping from gfn to pfn may be changed since we can only ensure the pfn -is not changed during cmpxchg. This is a ABA problem, for example, below case -will happen: - -At the beginning: -gpte = gfn1 -gfn1 is mapped to pfn1 on host -spte is the shadow page table entry corresponding with gpte and -spte = pfn1 - - VCPU 0 VCPU0 -on fast page fault path: - - old_spte = *spte; - pfn1 is swapped out: - spte = 0; - - pfn1 is re-alloced for gfn2. - - gpte is changed to point to - gfn2 by the guest: - spte = pfn1; - - if (cmpxchg(spte, old_spte, old_spte+W) - mark_page_dirty(vcpu->kvm, gfn1) - OOPS!!! - -We dirty-log for gfn1, that means gfn2 is lost in dirty-bitmap. - -For direct sp, we can easily avoid it since the spte of direct sp is fixed -to gfn. For indirect sp, before we do cmpxchg, we call gfn_to_pfn_atomic() -to pin gfn to pfn, because after gfn_to_pfn_atomic(): -- We have held the refcount of pfn that means the pfn can not be freed and - be reused for another gfn. -- The pfn is writable that means it can not be shared between different gfns - by KSM. - -Then, we can ensure the dirty bitmaps is correctly set for a gfn. - -Currently, to simplify the whole things, we disable fast page fault for -indirect shadow page. - -2): Dirty bit tracking -In the origin code, the spte can be fast updated (non-atomically) if the -spte is read-only and the Accessed bit has already been set since the -Accessed bit and Dirty bit can not be lost. - -But it is not true after fast page fault since the spte can be marked -writable between reading spte and updating spte. Like below case: - -At the beginning: -spte.W = 0 -spte.Accessed = 1 - - VCPU 0 VCPU0 -In mmu_spte_clear_track_bits(): - - old_spte = *spte; - - /* 'if' condition is satisfied. */ - if (old_spte.Accessed == 1 && - old_spte.W == 0) - spte = 0ull; - on fast page fault path: - spte.W = 1 - memory write on the spte: - spte.Dirty = 1 - - - else - old_spte = xchg(spte, 0ull) - - - if (old_spte.Accessed == 1) - kvm_set_pfn_accessed(spte.pfn); - if (old_spte.Dirty == 1) - kvm_set_pfn_dirty(spte.pfn); - OOPS!!! - -The Dirty bit is lost in this case. - -In order to avoid this kind of issue, we always treat the spte as "volatile" -if it can be updated out of mmu-lock, see spte_has_volatile_bits(), it means, -the spte is always atomically updated in this case. - -3): flush tlbs due to spte updated -If the spte is updated from writable to readonly, we should flush all TLBs, -otherwise rmap_write_protect will find a read-only spte, even though the -writable spte might be cached on a CPU's TLB. - -As mentioned before, the spte can be updated to writable out of mmu-lock on -fast page fault path, in order to easily audit the path, we see if TLBs need -be flushed caused by this reason in mmu_spte_update() since this is a common -function to update spte (present -> present). - -Since the spte is "volatile" if it can be updated out of mmu-lock, we always -atomically update the spte, the race caused by fast page fault can be avoided, -See the comments in spte_has_volatile_bits() and mmu_spte_update(). - -Lockless Access Tracking: - -This is used for Intel CPUs that are using EPT but do not support the EPT A/D -bits. In this case, when the KVM MMU notifier is called to track accesses to a -page (via kvm_mmu_notifier_clear_flush_young), it marks the PTE as not-present -by clearing the RWX bits in the PTE and storing the original R & X bits in -some unused/ignored bits. In addition, the SPTE_SPECIAL_MASK is also set on the -PTE (using the ignored bit 62). When the VM tries to access the page later on, -a fault is generated and the fast page fault mechanism described above is used -to atomically restore the PTE to a Present state. The W bit is not saved when -the PTE is marked for access tracking and during restoration to the Present -state, the W bit is set depending on whether or not it was a write access. If -it wasn't, then the W bit will remain clear until a write access happens, at -which time it will be set using the Dirty tracking mechanism described above. - -3. Reference ------------- - -Name: kvm_lock -Type: mutex -Arch: any -Protects: - vm_list - -Name: kvm_count_lock -Type: raw_spinlock_t -Arch: any -Protects: - hardware virtualization enable/disable -Comment: 'raw' because hardware enabling/disabling must be atomic /wrt - migration. - -Name: kvm_arch::tsc_write_lock -Type: raw_spinlock -Arch: x86 -Protects: - kvm_arch::{last_tsc_write,last_tsc_nsec,last_tsc_offset} - - tsc offset in vmcb -Comment: 'raw' because updating the tsc offsets must not be preempted. - -Name: kvm->mmu_lock -Type: spinlock_t -Arch: any -Protects: -shadow page/shadow tlb entry -Comment: it is a spinlock since it is used in mmu notifier. - -Name: kvm->srcu -Type: srcu lock -Arch: any -Protects: - kvm->memslots - - kvm->buses -Comment: The srcu read lock must be held while accessing memslots (e.g. - when using gfn_to_* functions) and while accessing in-kernel - MMIO/PIO address->device structure mapping (kvm->buses). - The srcu index can be stored in kvm_vcpu->srcu_idx per vcpu - if it is needed by multiple functions. - -Name: blocked_vcpu_on_cpu_lock -Type: spinlock_t -Arch: x86 -Protects: blocked_vcpu_on_cpu -Comment: This is a per-CPU lock and it is used for VT-d posted-interrupts. - When VT-d posted-interrupts is supported and the VM has assigned - devices, we put the blocked vCPU on the list blocked_vcpu_on_cpu - protected by blocked_vcpu_on_cpu_lock, when VT-d hardware issues - wakeup notification event since external interrupts from the - assigned devices happens, we will find the vCPU on the list to - wakeup. From patchwork Mon Feb 10 06:03:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372553 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A8B0D92A for ; Mon, 10 Feb 2020 06:03:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7DA5421927 for ; Mon, 10 Feb 2020 06:03:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314621; bh=+rRbAd3TlFK7nPTr4w5ejAYTzpI7e3h8QdYEc9RALgw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=u6bKv/ektrpXgitKRAcw96Vc6dl5eOEmpC/VC/PvqcTsBT3C/AocrIOwwRkpzXrjE tx5ZyAY5HmJs9Tpy7URdhDf3zB6HUq+8qoTAcM1pY6jl+g/P7Dcxf7TjF+SsN3DHXW Z9P2v5O4zbfbcHntYspnsZoIV5XWxtX6/YvbFodg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727726AbgBJGDj (ORCPT ); Mon, 10 Feb 2020 01:03:39 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36398 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727538AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=qTpK99sN7WRqIfWf+ZjYD4CgBdyOTvR2MsNxs1Vzre8=; b=S5RThnkICdrMzL6Xf5nRW+bQhk liXCG8vSjwnfEj7A8il8iYZadVrF/i11Ldpj2Gy9z5hVF2yO9HwUHpio8lh7MrmLadOWHUMtXW1l/ JVEIhjVpbUfEVZeP5RtAvbuzbtKZWTgxqQILDU2v0aw56mRYjF7jZtLQC9n25JgqFnMCMqHJrC4Re TRX1z4g5yej2n7ydjVb9T+NLaEENRkQ2sex40FHvZD0CiOza6vdrIdfhy1hJCBL97e56vLWEWw2V7 MRkPC0vkUSRyQ7lzM4sTXRc7/ouNWf3pt5m66V1HWartdpm/Hx3MRleuCKyGkBZJbJatCZu0p3pUF GcDrU+Yw==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Tw-9B; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2WL-Io; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 22/28] docs: kvm: Convert mmu.txt to ReST format Date: Mon, 10 Feb 2020 07:03:00 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use document title and chapter markups; - Add markups for tables; - Add markups for literal blocks; - Add blank lines and adjust indentation. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/index.rst | 1 + Documentation/virt/kvm/{mmu.txt => mmu.rst} | 62 ++++++++++++++++----- 2 files changed, 49 insertions(+), 14 deletions(-) rename Documentation/virt/kvm/{mmu.txt => mmu.rst} (94%) diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index 9be8f53b729d..95e2487d38f4 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -13,6 +13,7 @@ KVM halt-polling hypercalls locking + mmu msr vcpu-requests diff --git a/Documentation/virt/kvm/mmu.txt b/Documentation/virt/kvm/mmu.rst similarity index 94% rename from Documentation/virt/kvm/mmu.txt rename to Documentation/virt/kvm/mmu.rst index dadb29e8738f..60981887d20b 100644 --- a/Documentation/virt/kvm/mmu.txt +++ b/Documentation/virt/kvm/mmu.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +====================== The x86 kvm shadow mmu ====================== @@ -7,27 +10,37 @@ physical addresses to host physical addresses. The mmu code attempts to satisfy the following requirements: -- correctness: the guest should not be able to determine that it is running +- correctness: + the guest should not be able to determine that it is running on an emulated mmu except for timing (we attempt to comply with the specification, not emulate the characteristics of a particular implementation such as tlb size) -- security: the guest must not be able to touch host memory not assigned +- security: + the guest must not be able to touch host memory not assigned to it -- performance: minimize the performance penalty imposed by the mmu -- scaling: need to scale to large memory and large vcpu guests -- hardware: support the full range of x86 virtualization hardware -- integration: Linux memory management code must be in control of guest memory +- performance: + minimize the performance penalty imposed by the mmu +- scaling: + need to scale to large memory and large vcpu guests +- hardware: + support the full range of x86 virtualization hardware +- integration: + Linux memory management code must be in control of guest memory so that swapping, page migration, page merging, transparent hugepages, and similar features work without change -- dirty tracking: report writes to guest memory to enable live migration +- dirty tracking: + report writes to guest memory to enable live migration and framebuffer-based displays -- footprint: keep the amount of pinned kernel memory low (most memory +- footprint: + keep the amount of pinned kernel memory low (most memory should be shrinkable) -- reliability: avoid multipage or GFP_ATOMIC allocations +- reliability: + avoid multipage or GFP_ATOMIC allocations Acronyms ======== +==== ==================================================================== pfn host page frame number hpa host physical address hva host virtual address @@ -41,6 +54,7 @@ pte page table entry (used also to refer generically to paging structure gpte guest pte (referring to gfns) spte shadow pte (referring to pfns) tdp two dimensional paging (vendor neutral term for NPT and EPT) +==== ==================================================================== Virtual and real hardware supported =================================== @@ -90,11 +104,13 @@ Events The mmu is driven by events, some from the guest, some from the host. Guest generated events: + - writes to control registers (especially cr3) - invlpg/invlpga instruction execution - access to missing or protected translations Host generated events: + - changes in the gpa->hpa translation (either through gpa->hva changes or through hva->hpa changes) - memory pressure (the shrinker) @@ -117,16 +133,19 @@ Leaf ptes point at guest pages. The following table shows translations encoded by leaf ptes, with higher-level translations in parentheses: - Non-nested guests: + Non-nested guests:: + nonpaging: gpa->hpa paging: gva->gpa->hpa paging, tdp: (gva->)gpa->hpa - Nested guests: + + Nested guests:: + non-tdp: ngva->gpa->hpa (*) tdp: (ngva->)ngpa->gpa->hpa -(*) the guest hypervisor will encode the ngva->gpa translation into its page - tables if npt is not present + (*) the guest hypervisor will encode the ngva->gpa translation into its page + tables if npt is not present Shadow pages contain the following information: role.level: @@ -291,28 +310,41 @@ Handling a page fault is performed as follows: - if the RSV bit of the error code is set, the page fault is caused by guest accessing MMIO and cached MMIO information is available. + - walk shadow page table - check for valid generation number in the spte (see "Fast invalidation of MMIO sptes" below) - cache the information to vcpu->arch.mmio_gva, vcpu->arch.mmio_access and vcpu->arch.mmio_gfn, and call the emulator + - If both P bit and R/W bit of error code are set, this could possibly be handled as a "fast page fault" (fixed without taking the MMU lock). See the description in Documentation/virt/kvm/locking.txt. + - if needed, walk the guest page tables to determine the guest translation (gva->gpa or ngpa->gpa) + - if permissions are insufficient, reflect the fault back to the guest + - determine the host page + - if this is an mmio request, there is no host page; cache the info to vcpu->arch.mmio_gva, vcpu->arch.mmio_access and vcpu->arch.mmio_gfn + - walk the shadow page table to find the spte for the translation, instantiating missing intermediate page tables as necessary + - If this is an mmio request, cache the mmio info to the spte and set some reserved bit on the spte (see callers of kvm_mmu_set_mmio_spte_mask) + - try to unsynchronize the page + - if successful, we can let the guest continue and modify the gpte + - emulate the instruction + - if failed, unshadow the page and let the guest continue + - update any translations that were modified by the instruction invlpg handling: @@ -324,10 +356,12 @@ invlpg handling: Guest control register updates: - mov to cr3 + - look up new shadow roots - synchronize newly reachable shadow pages - mov to cr0/cr4/efer + - set up mmu context for new paging mode - look up new shadow roots - synchronize newly reachable shadow pages @@ -358,6 +392,7 @@ on fault type: (user write faults generate a #PF) In the first case there are two additional complications: + - if CR4.SMEP is enabled: since we've turned the page into a kernel page, the kernel may now execute it. We handle this by also setting spte.nx. If we get a user fetch or read fault, we'll change spte.u=1 and @@ -446,4 +481,3 @@ Further reading - NPT presentation from KVM Forum 2008 http://www.linux-kvm.org/images/c/c8/KvmForum2008%24kdf2008_21.pdf - From patchwork Mon Feb 10 06:03:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372577 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B8E1614B4 for ; Mon, 10 Feb 2020 06:03:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9829224656 for ; Mon, 10 Feb 2020 06:03:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314639; bh=60RSXW44yNEj8FiDNv1QrFsi8MaCSUjBdmEwFNfoauE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SheGns/fnDYHKl2+RuFT0e7iqhJQtNpfNTZcoYf5uPd82/H2eNSvUeWHSji0U3ObQ Uy61b0rp5NZHSF0KLF4ivbxexxbOe9xnLBSjb3cSSc7TPvjsMAoNNDCAykvqiFCBUx zisynTjywvsnRnRwxvRSMtCjsuxM0S+EiClrnvHM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727755AbgBJGDp (ORCPT ); Mon, 10 Feb 2020 01:03:45 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36348 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727529AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=XosaEvF5KfBIIrC0UH6xsRambxzgg5W02cFwNp6pBOU=; b=ST/AVNVep2gTSjVNM1k6xoRsXb YJ7sxMVLtwo4IBHdyiooEdTgEY4vO/BpPXpGyZ1GxFYvGyIzv6j2682/DiKEGq3iLf1XwXwYUbp2W JzysTJ1SLJv4JSOC4WnYYQlpHWQs7k8zH6A69S2Eq76MFbydjVGDies0jRT2gqxUqNBTl3tgRVZYz QqqTfC5a7ZB4GVIpB2WQrzHlubpA3yJvp8/QBmJeD+bsToi1o/HZAzz1x8iY3i2m05+EefQzx3g3A DnlmOZeOMH7581pai+1fWHCqyJw6gW1KjbZuPJKL2SfZ7BLZXB9/4Q1F4KLSPitxAzIvrvQbyDGGd 8qYJJ5iA==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Tx-AV; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2WQ-KM; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 23/28] docs: kvm: Convert nested-vmx.txt to ReST format Date: Mon, 10 Feb 2020 07:03:01 +0100 Message-Id: <9ca9ada5133bd9c10208f78eafc34f263ceecb7d.1581314317.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This file is almost in ReST format. Just a small set of changes were needed: - Add markups for lists; - Add markups for a literal block; - Adjust whitespaces. While here, use the standard markup for the document title. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/index.rst | 1 + .../kvm/{nested-vmx.txt => nested-vmx.rst} | 37 +++++++++++-------- 2 files changed, 22 insertions(+), 16 deletions(-) rename Documentation/virt/kvm/{nested-vmx.txt => nested-vmx.rst} (90%) diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index 95e2487d38f4..123385d0a74a 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -15,6 +15,7 @@ KVM locking mmu msr + nested-vmx vcpu-requests arm/index diff --git a/Documentation/virt/kvm/nested-vmx.txt b/Documentation/virt/kvm/nested-vmx.rst similarity index 90% rename from Documentation/virt/kvm/nested-vmx.txt rename to Documentation/virt/kvm/nested-vmx.rst index 97eb1353e962..592b0ab6970b 100644 --- a/Documentation/virt/kvm/nested-vmx.txt +++ b/Documentation/virt/kvm/nested-vmx.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========== Nested VMX ========== @@ -41,9 +44,9 @@ No modifications are required to user space (qemu). However, qemu's default emulated CPU type (qemu64) does not list the "VMX" CPU feature, so it must be explicitly enabled, by giving qemu one of the following options: - -cpu host (emulated CPU has all features of the real CPU) + - cpu host (emulated CPU has all features of the real CPU) - -cpu qemu64,+vmx (add just the vmx feature to a named CPU type) + - cpu qemu64,+vmx (add just the vmx feature to a named CPU type) ABIs @@ -75,6 +78,8 @@ of this structure changes, this can break live migration across KVM versions. VMCS12_REVISION (from vmx.c) should be changed if struct vmcs12 or its inner struct shadow_vmcs is ever changed. +:: + typedef u64 natural_width; struct __packed vmcs12 { /* According to the Intel spec, a VMCS region must start with @@ -220,21 +225,21 @@ Authors ------- These patches were written by: - Abel Gordon, abelg il.ibm.com - Nadav Har'El, nyh il.ibm.com - Orit Wasserman, oritw il.ibm.com - Ben-Ami Yassor, benami il.ibm.com - Muli Ben-Yehuda, muli il.ibm.com + - Abel Gordon, abelg il.ibm.com + - Nadav Har'El, nyh il.ibm.com + - Orit Wasserman, oritw il.ibm.com + - Ben-Ami Yassor, benami il.ibm.com + - Muli Ben-Yehuda, muli il.ibm.com With contributions by: - Anthony Liguori, aliguori us.ibm.com - Mike Day, mdday us.ibm.com - Michael Factor, factor il.ibm.com - Zvi Dubitzky, dubi il.ibm.com + - Anthony Liguori, aliguori us.ibm.com + - Mike Day, mdday us.ibm.com + - Michael Factor, factor il.ibm.com + - Zvi Dubitzky, dubi il.ibm.com And valuable reviews by: - Avi Kivity, avi redhat.com - Gleb Natapov, gleb redhat.com - Marcelo Tosatti, mtosatti redhat.com - Kevin Tian, kevin.tian intel.com - and others. + - Avi Kivity, avi redhat.com + - Gleb Natapov, gleb redhat.com + - Marcelo Tosatti, mtosatti redhat.com + - Kevin Tian, kevin.tian intel.com + - and others. From patchwork Mon Feb 10 06:03:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372557 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5D29817F0 for ; Mon, 10 Feb 2020 06:03:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A2D424656 for ; Mon, 10 Feb 2020 06:03:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314624; bh=Pozb8GosQz9LrLDhDXKXyDoelLpC8NqP+5UFTtVm7Ps=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IoL9o2OTyb/3uKC8f5C2PKAb0Gzt7RyE6eul0fnk2EuGyG1CujQKWr6fw76QjU2Sk okvCokLVMlSsbn2POFh9v56gEPWJ04N05VauOr5FoaCRS81VI2SZ57ywubqdbdB7Ag LmfB0O33ah6sZjS7Z6tEQS0Z+El3Cj/ekwmMaRYo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727729AbgBJGDn (ORCPT ); Mon, 10 Feb 2020 01:03:43 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36366 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727536AbgBJGDM (ORCPT ); Mon, 10 Feb 2020 01:03:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=fPgd99gzsbfnyTVf997Pxp90sDFuBPYNRjGGdOIoAxs=; b=TXNXLGcqt5vieVnBrUlVn4Flzz QgTyjpQT6PK8K0CiaXiFNBwokq2+jEcjoAhcuGc6MPVzIqcDKs+G+rQYHMlfbFSdycvSsdMYHz7Az 1LF1ee3O45clVoazI5rZkIft1pMx1hovgtTR6N+oxGUlR/AJ+neAvTL3exaBiiMWzqQm5cOy/v8co cW1/KDdy1qYPkf88XavOd/Ef0suKzWKjOFphkjLe6mznBhgojuBJbVUyS6WqFfCfgxO1Z6TgGB2yo CFaXzEHb7VSsNNlXIDrkxMI+ktWFbjrTacVXByE5qX0wuJZOVfbzfds8bpq2PQHJ8WXwoOF5qKhxV bW6YFfew==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A4-0006Ty-DZ; Mon, 10 Feb 2020 06:03:12 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2WV-Ls; Mon, 10 Feb 2020 07:03:10 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 24/28] docs: kvm: Convert ppc-pv.txt to ReST format Date: Mon, 10 Feb 2020 07:03:02 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use document title and chapter markups; - Add markups for tables; - Use list markups; - Add markups for literal blocks; - Add blank lines. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/index.rst | 1 + .../virt/kvm/{ppc-pv.txt => ppc-pv.rst} | 26 +++++++++++++------ 2 files changed, 19 insertions(+), 8 deletions(-) rename Documentation/virt/kvm/{ppc-pv.txt => ppc-pv.rst} (91%) diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index 123385d0a74a..d0e17e717461 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -16,6 +16,7 @@ KVM mmu msr nested-vmx + ppc-pv vcpu-requests arm/index diff --git a/Documentation/virt/kvm/ppc-pv.txt b/Documentation/virt/kvm/ppc-pv.rst similarity index 91% rename from Documentation/virt/kvm/ppc-pv.txt rename to Documentation/virt/kvm/ppc-pv.rst index e26115ce4258..5fdb907670be 100644 --- a/Documentation/virt/kvm/ppc-pv.txt +++ b/Documentation/virt/kvm/ppc-pv.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================================= The PPC KVM paravirtual interface ================================= @@ -34,8 +37,9 @@ up the hypercall. To call a hypercall, just call these instructions. The parameters are as follows: + ======== ================ ================ Register IN OUT - + ======== ================ ================ r0 - volatile r3 1st parameter Return code r4 2nd parameter 1st output value @@ -47,6 +51,7 @@ The parameters are as follows: r10 8th parameter 7th output value r11 hypercall number 8th output value r12 - volatile + ======== ================ ================ Hypercall definitions are shared in generic code, so the same hypercall numbers apply for x86 and powerpc alike with the exception that each KVM hypercall @@ -54,11 +59,13 @@ also needs to be ORed with the KVM vendor code which is (42 << 16). Return codes can be as follows: + ==== ========================= Code Meaning - + ==== ========================= 0 Success 12 Hypercall not implemented <0 Error + ==== ========================= The magic page ============== @@ -72,7 +79,7 @@ desired location. The first parameter indicates the effective address when the MMU is enabled. The second parameter indicates the address in real mode, if applicable to the target. For now, we always map the page to -4096. This way we can access it using absolute load and store functions. The following -instruction reads the first field of the magic page: +instruction reads the first field of the magic page:: ld rX, -4096(0) @@ -93,8 +100,10 @@ a bitmap of available features inside the magic page. The following enhancements to the magic page are currently available: + ============================ ======================================= KVM_MAGIC_FEAT_SR Maps SR registers r/w in the magic page KVM_MAGIC_FEAT_MAS0_TO_SPRG7 Maps MASn, ESR, PIR and high SPRGs + ============================ ======================================= For enhanced features in the magic page, please check for the existence of the feature before using them! @@ -121,8 +130,8 @@ when entering the guest or don't have any impact on the hypervisor's behavior. The following bits are safe to be set inside the guest: - MSR_EE - MSR_RI + - MSR_EE + - MSR_RI If any other bit changes in the MSR, please still use mtmsr(d). @@ -138,9 +147,9 @@ guest. Implementing any of those mappings is optional, as the instruction traps also act on the shared page. So calling privileged instructions still works as before. +======================= ================================ From To -==== == - +======================= ================================ mfmsr rX ld rX, magic_page->msr mfsprg rX, 0 ld rX, magic_page->sprg0 mfsprg rX, 1 ld rX, magic_page->sprg1 @@ -173,7 +182,7 @@ mtsrin rX, rY b [BookE only] wrteei [0|1] b - +======================= ================================ Some instructions require more logic to determine what's going on than a load or store instruction can deliver. To enable patching of those, we keep some @@ -191,6 +200,7 @@ for example. Hypercall ABIs in KVM on PowerPC ================================= + 1) KVM hypercalls (ePAPR) These are ePAPR compliant hypercall implementation (mentioned above). Even From patchwork Mon Feb 10 06:03:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372527 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AB37992A for ; Mon, 10 Feb 2020 06:03:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8AB0124680 for ; Mon, 10 Feb 2020 06:03:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314606; bh=NVrL1r/WD2UJey4RkFo5kuJwFbJVgc7nDJEPRpKPRYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ow1nH3bOJkeFEXlxQwYOn/1OGeCTuX2HawKLoE5o2Cr2b6c1fB2r09dzUCzalrk7Q 7OHr572GZXWyE43opX2eY0AWXAGHOoK0YBrE5w4syRps1/4ifE2J3O+El1s2VvT/vj p6ehbQlxKlZ6YDTnd+5VgNaKEQQlmHPw1CqbAfRA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727697AbgBJGDY (ORCPT ); Mon, 10 Feb 2020 01:03:24 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36458 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727582AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=v0HoWkcIfPjQPsHagVx5eBe/TlRMM8+XhIwobLt5XOw=; b=QwGtCIII2TMvX3zAHgzKxUcYny o7K2r1kZWJFL+aJROK5R4rngdQo51C5XDS9BIW8KRst0dOTDkg0sPeAuuL6h2aLH9Tudcy1dLY/jv zO1bZFm4CUUEHcDzBbjHSOzmu6IMV7MbmMp3VMrZeLovF7V3f/E4NBpchsPY5o8nD2f3lU/dCLr5r VLL329/b6hwDTob4K9Yso33+T1o/00Cx+mHYBjR8RF67JtoDE/UAI6Aos6kpyyPUsdg5x4ISFqWau lxBL9ykAf/+HRg35LNXccjj6TnW9kMIYudIBtqCI6gnOuo2yf6tqXRSdcFCPg8hIhJdarF12KObVJ b6T0nyuA==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A5-0006Uw-Di; Mon, 10 Feb 2020 06:03:13 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A2-00C2Wa-Oe; Mon, 10 Feb 2020 07:03:11 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, Cornelia Huck Subject: [PATCH 25/28] docs: kvm: Convert s390-diag.txt to ReST format Date: Mon, 10 Feb 2020 07:03:03 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This file is almost in ReST format. Just one change was needed: - Add markups for a literal block and change its indentation. While here, use the standard markup for the document title. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Cornelia Huck --- Documentation/virt/kvm/index.rst | 1 + .../virt/kvm/{s390-diag.txt => s390-diag.rst} | 13 ++++++++----- 2 files changed, 9 insertions(+), 5 deletions(-) rename Documentation/virt/kvm/{s390-diag.txt => s390-diag.rst} (90%) diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index d0e17e717461..e5ea75f97d52 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -17,6 +17,7 @@ KVM msr nested-vmx ppc-pv + s390-diag vcpu-requests arm/index diff --git a/Documentation/virt/kvm/s390-diag.txt b/Documentation/virt/kvm/s390-diag.rst similarity index 90% rename from Documentation/virt/kvm/s390-diag.txt rename to Documentation/virt/kvm/s390-diag.rst index 7c52e5f8b210..eaac4864d3d6 100644 --- a/Documentation/virt/kvm/s390-diag.txt +++ b/Documentation/virt/kvm/s390-diag.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================= The s390 DIAGNOSE call on KVM ============================= @@ -16,12 +19,12 @@ DIAGNOSE calls by the guest cause a mandatory intercept. This implies all supported DIAGNOSE calls need to be handled by either KVM or its userspace. -All DIAGNOSE calls supported by KVM use the RS-a format: +All DIAGNOSE calls supported by KVM use the RS-a format:: --------------------------------------- -| '83' | R1 | R3 | B2 | D2 | --------------------------------------- -0 8 12 16 20 31 + -------------------------------------- + | '83' | R1 | R3 | B2 | D2 | + -------------------------------------- + 0 8 12 16 20 31 The second-operand address (obtained by the base/displacement calculation) is not used to address data. Instead, bits 48-63 of this address specify From patchwork Mon Feb 10 06:03:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372513 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8F0F617F0 for ; Mon, 10 Feb 2020 06:03:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 640E124685 for ; Mon, 10 Feb 2020 06:03:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314600; bh=B47c8Al+6iQ2tgcWTE3AAmrsaWJcmEa6iC3S6ArETJs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=q0tqtMpCEt4I2Ol52ObXsFkcdnroNYvQj860dgsEKsbJ0U27Qsi1mdvuD4FMuurnV Vy4ulUo+ywWoOK1EHG0/zPOUHcTjXWsAcVc/m5KT0MtpxrIUBqPZFNgdV6cOd0jQpZ ikHP4zEUhkPrwPvWZFrc3B++zYH+rHxkyZE2v0II= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727639AbgBJGDS (ORCPT ); Mon, 10 Feb 2020 01:03:18 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36480 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727594AbgBJGDO (ORCPT ); Mon, 10 Feb 2020 01:03:14 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=FqVErvmVr/kmvX0U1kiBgRQBNHoVkPvgsDYIqSYOrG8=; b=IJE/wgw3uFg0hhKNd6iU+44DdM Yy7jpebabQAVzVnAk6Xqjf2jPfU+lBkETk+W3QWViyJuy3EXaBBZiiCDQT0mizxgDtcv3AiTYCF7n N8u0t8C8EHVChKcFMsSljBEw/NAmGvmwfOsLhrxr18bC/X8ggGpmPSUNDShmqvA79ZWh63XFyWG0T 65fTWksey3Ra9xDgOCV3yy5Escryol3fDK0VsbYOvMGnnI3xeURhWPCpyb2HMWfJVpthxzaqYxSBl V61C4TEovbp6yHjNtk5UIHFrsWDMpFB4RMj0EjNanRugnXQTyz8Y/Tvupq9O5w/Letd7v8+EvXyLC EOVBc8oQ==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A5-0006V0-EY; Mon, 10 Feb 2020 06:03:13 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A3-00C2Wg-Oc; Mon, 10 Feb 2020 07:03:11 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 26/28] docs: kvm: Convert timekeeping.txt to ReST format Date: Mon, 10 Feb 2020 07:03:04 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Use document title and chapter markups; - Add markups for literal blocks; - Add markups for tables; - use :field: for field descriptions; - Add blank lines and adjust indentation. Signed-off-by: Mauro Carvalho Chehab --- Documentation/virt/kvm/index.rst | 1 + .../kvm/{timekeeping.txt => timekeeping.rst} | 221 ++++++++++-------- 2 files changed, 128 insertions(+), 94 deletions(-) rename Documentation/virt/kvm/{timekeeping.txt => timekeeping.rst} (85%) diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index e5ea75f97d52..7c1be8910837 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -18,6 +18,7 @@ KVM nested-vmx ppc-pv s390-diag + timekeeping vcpu-requests arm/index diff --git a/Documentation/virt/kvm/timekeeping.txt b/Documentation/virt/kvm/timekeeping.rst similarity index 85% rename from Documentation/virt/kvm/timekeeping.txt rename to Documentation/virt/kvm/timekeeping.rst index 76808a17ad84..21ae7efa29ba 100644 --- a/Documentation/virt/kvm/timekeeping.txt +++ b/Documentation/virt/kvm/timekeeping.rst @@ -1,17 +1,21 @@ +.. SPDX-License-Identifier: GPL-2.0 - Timekeeping Virtualization for X86-Based Architectures +====================================================== +Timekeeping Virtualization for X86-Based Architectures +====================================================== - Zachary Amsden - Copyright (c) 2010, Red Hat. All rights reserved. +:Author: Zachary Amsden +:Copyright: (c) 2010, Red Hat. All rights reserved. -1) Overview -2) Timing Devices -3) TSC Hardware -4) Virtualization Problems +.. Contents -========================================================================= + 1) Overview + 2) Timing Devices + 3) TSC Hardware + 4) Virtualization Problems -1) Overview +1. Overview +=========== One of the most complicated parts of the X86 platform, and specifically, the virtualization of this platform is the plethora of timing devices available @@ -27,15 +31,15 @@ The purpose of this document is to collect data and information relevant to timekeeping which may be difficult to find elsewhere, specifically, information relevant to KVM and hardware-based virtualization. -========================================================================= - -2) Timing Devices +2. Timing Devices +================= First we discuss the basic hardware devices available. TSC and the related KVM clock are special enough to warrant a full exposition and are described in the following section. -2.1) i8254 - PIT +2.1. i8254 - PIT +---------------- One of the first timer devices available is the programmable interrupt timer, or PIT. The PIT has a fixed frequency 1.193182 MHz base clock and three @@ -50,13 +54,13 @@ The PIT uses I/O ports 0x40 - 0x43. Access to the 16-bit counters is done using single or multiple byte access to the I/O ports. There are 6 modes available, but not all modes are available to all timers, as only timer 2 has a connected gate input, required for modes 1 and 5. The gate line is -controlled by port 61h, bit 0, as illustrated in the following diagram. +controlled by port 61h, bit 0, as illustrated in the following diagram:: - -------------- ---------------- -| | | | -| 1.1932 MHz |---------->| CLOCK OUT | ---------> IRQ 0 -| Clock | | | | - -------------- | +->| GATE TIMER 0 | + -------------- ---------------- + | | | | + | 1.1932 MHz|---------->| CLOCK OUT | ---------> IRQ 0 + | Clock | | | | + -------------- | +->| GATE TIMER 0 | | ---------------- | | ---------------- @@ -70,29 +74,33 @@ controlled by port 61h, bit 0, as illustrated in the following diagram. | | | |------>| CLOCK OUT | ---------> Port 61h, bit 5 | | | -Port 61h, bit 0 ---------->| GATE TIMER 2 | \_.---- ____ + Port 61h, bit 0 -------->| GATE TIMER 2 | \_.---- ____ ---------------- _| )--|LPF|---Speaker / *---- \___/ -Port 61h, bit 1 -----------------------------------/ + Port 61h, bit 1 ---------------------------------/ The timer modes are now described. -Mode 0: Single Timeout. This is a one-shot software timeout that counts down +Mode 0: Single Timeout. + This is a one-shot software timeout that counts down when the gate is high (always true for timers 0 and 1). When the count reaches zero, the output goes high. -Mode 1: Triggered One-shot. The output is initially set high. When the gate +Mode 1: Triggered One-shot. + The output is initially set high. When the gate line is set high, a countdown is initiated (which does not stop if the gate is lowered), during which the output is set low. When the count reaches zero, the output goes high. -Mode 2: Rate Generator. The output is initially set high. When the countdown +Mode 2: Rate Generator. + The output is initially set high. When the countdown reaches 1, the output goes low for one count and then returns high. The value is reloaded and the countdown automatically resumes. If the gate line goes low, the count is halted. If the output is low when the gate is lowered, the output automatically goes high (this only affects timer 2). -Mode 3: Square Wave. This generates a high / low square wave. The count +Mode 3: Square Wave. + This generates a high / low square wave. The count determines the length of the pulse, which alternates between high and low when zero is reached. The count only proceeds when gate is high and is automatically reloaded on reaching zero. The count is decremented twice at @@ -103,12 +111,14 @@ Mode 3: Square Wave. This generates a high / low square wave. The count values are not observed when reading. This is the intended mode for timer 2, which generates sine-like tones by low-pass filtering the square wave output. -Mode 4: Software Strobe. After programming this mode and loading the counter, +Mode 4: Software Strobe. + After programming this mode and loading the counter, the output remains high until the counter reaches zero. Then the output goes low for 1 clock cycle and returns high. The counter is not reloaded. Counting only occurs when gate is high. -Mode 5: Hardware Strobe. After programming and loading the counter, the +Mode 5: Hardware Strobe. + After programming and loading the counter, the output remains high. When the gate is raised, a countdown is initiated (which does not stop if the gate is lowered). When the counter reaches zero, the output goes low for 1 clock cycle and then returns high. The counter is @@ -118,49 +128,49 @@ In addition to normal binary counting, the PIT supports BCD counting. The command port, 0x43 is used to set the counter and mode for each of the three timers. -PIT commands, issued to port 0x43, using the following bit encoding: +PIT commands, issued to port 0x43, using the following bit encoding:: -Bit 7-4: Command (See table below) -Bit 3-1: Mode (000 = Mode 0, 101 = Mode 5, 11X = undefined) -Bit 0 : Binary (0) / BCD (1) + Bit 7-4: Command (See table below) + Bit 3-1: Mode (000 = Mode 0, 101 = Mode 5, 11X = undefined) + Bit 0 : Binary (0) / BCD (1) -Command table: +Command table:: -0000 - Latch Timer 0 count for port 0x40 + 0000 - Latch Timer 0 count for port 0x40 sample and hold the count to be read in port 0x40; additional commands ignored until counter is read; mode bits ignored. -0001 - Set Timer 0 LSB mode for port 0x40 + 0001 - Set Timer 0 LSB mode for port 0x40 set timer to read LSB only and force MSB to zero; mode bits set timer mode -0010 - Set Timer 0 MSB mode for port 0x40 + 0010 - Set Timer 0 MSB mode for port 0x40 set timer to read MSB only and force LSB to zero; mode bits set timer mode -0011 - Set Timer 0 16-bit mode for port 0x40 + 0011 - Set Timer 0 16-bit mode for port 0x40 set timer to read / write LSB first, then MSB; mode bits set timer mode -0100 - Latch Timer 1 count for port 0x41 - as described above -0101 - Set Timer 1 LSB mode for port 0x41 - as described above -0110 - Set Timer 1 MSB mode for port 0x41 - as described above -0111 - Set Timer 1 16-bit mode for port 0x41 - as described above + 0100 - Latch Timer 1 count for port 0x41 - as described above + 0101 - Set Timer 1 LSB mode for port 0x41 - as described above + 0110 - Set Timer 1 MSB mode for port 0x41 - as described above + 0111 - Set Timer 1 16-bit mode for port 0x41 - as described above -1000 - Latch Timer 2 count for port 0x42 - as described above -1001 - Set Timer 2 LSB mode for port 0x42 - as described above -1010 - Set Timer 2 MSB mode for port 0x42 - as described above -1011 - Set Timer 2 16-bit mode for port 0x42 as described above + 1000 - Latch Timer 2 count for port 0x42 - as described above + 1001 - Set Timer 2 LSB mode for port 0x42 - as described above + 1010 - Set Timer 2 MSB mode for port 0x42 - as described above + 1011 - Set Timer 2 16-bit mode for port 0x42 as described above -1101 - General counter latch + 1101 - General counter latch Latch combination of counters into corresponding ports Bit 3 = Counter 2 Bit 2 = Counter 1 Bit 1 = Counter 0 Bit 0 = Unused -1110 - Latch timer status + 1110 - Latch timer status Latch combination of counter mode into corresponding ports Bit 3 = Counter 2 Bit 2 = Counter 1 @@ -177,7 +187,8 @@ Command table: Bit 3-1 = Mode Bit 0 = Binary (0) / BCD mode (1) -2.2) RTC +2.2. RTC +-------- The second device which was available in the original PC was the MC146818 real time clock. The original device is now obsolete, and usually emulated by the @@ -201,21 +212,21 @@ in progress, as indicated in the status register. The clock uses a 32.768kHz crystal, so bits 6-4 of register A should be programmed to a 32kHz divider if the RTC is to count seconds. -This is the RAM map originally used for the RTC/CMOS: +This is the RAM map originally used for the RTC/CMOS:: -Location Size Description ------------------------------------------- -00h byte Current second (BCD) -01h byte Seconds alarm (BCD) -02h byte Current minute (BCD) -03h byte Minutes alarm (BCD) -04h byte Current hour (BCD) -05h byte Hours alarm (BCD) -06h byte Current day of week (BCD) -07h byte Current day of month (BCD) -08h byte Current month (BCD) -09h byte Current year (BCD) -0Ah byte Register A + Location Size Description + ------------------------------------------ + 00h byte Current second (BCD) + 01h byte Seconds alarm (BCD) + 02h byte Current minute (BCD) + 03h byte Minutes alarm (BCD) + 04h byte Current hour (BCD) + 05h byte Hours alarm (BCD) + 06h byte Current day of week (BCD) + 07h byte Current day of month (BCD) + 08h byte Current month (BCD) + 09h byte Current year (BCD) + 0Ah byte Register A bit 7 = Update in progress bit 6-4 = Divider for clock 000 = 4.194 MHz @@ -234,7 +245,7 @@ Location Size Description 1101 = 125 mS 1110 = 250 mS 1111 = 500 mS -0Bh byte Register B + 0Bh byte Register B bit 7 = Run (0) / Halt (1) bit 6 = Periodic interrupt enable bit 5 = Alarm interrupt enable @@ -243,19 +254,20 @@ Location Size Description bit 2 = BCD calendar (0) / Binary (1) bit 1 = 12-hour mode (0) / 24-hour mode (1) bit 0 = 0 (DST off) / 1 (DST enabled) -OCh byte Register C (read only) + OCh byte Register C (read only) bit 7 = interrupt request flag (IRQF) bit 6 = periodic interrupt flag (PF) bit 5 = alarm interrupt flag (AF) bit 4 = update interrupt flag (UF) bit 3-0 = reserved -ODh byte Register D (read only) + ODh byte Register D (read only) bit 7 = RTC has power bit 6-0 = reserved -32h byte Current century BCD (*) + 32h byte Current century BCD (*) (*) location vendor specific and now determined from ACPI global tables -2.3) APIC +2.3. APIC +--------- On Pentium and later processors, an on-board timer is available to each CPU as part of the Advanced Programmable Interrupt Controller. The APIC is @@ -276,7 +288,8 @@ timer is programmed through the LVT (local vector timer) register, is capable of one-shot or periodic operation, and is based on the bus clock divided down by the programmable divider register. -2.4) HPET +2.4. HPET +--------- HPET is quite complex, and was originally intended to replace the PIT / RTC support of the X86 PC. It remains to be seen whether that will be the case, as @@ -297,7 +310,8 @@ indicated through ACPI tables by the BIOS. Detailed specification of the HPET is beyond the current scope of this document, as it is also very well documented elsewhere. -2.5) Offboard Timers +2.5. Offboard Timers +-------------------- Several cards, both proprietary (watchdog boards) and commonplace (e1000) have timing chips built into the cards which may have registers which are accessible @@ -307,9 +321,8 @@ general frowned upon as not playing by the agreed rules of the game. Such a timer device would require additional support to be virtualized properly and is not considered important at this time as no known operating system does this. -========================================================================= - -3) TSC Hardware +3. TSC Hardware +=============== The TSC or time stamp counter is relatively simple in theory; it counts instruction cycles issued by the processor, which can be used as a measure of @@ -340,7 +353,8 @@ allows the guest visible TSC to be offset by a constant. Newer implementations promise to allow the TSC to additionally be scaled, but this hardware is not yet widely available. -3.1) TSC synchronization +3.1. TSC synchronization +------------------------ The TSC is a CPU-local clock in most implementations. This means, on SMP platforms, the TSCs of different CPUs may start at different times depending @@ -357,7 +371,8 @@ practice, getting a perfectly synchronized TSC will not be possible unless all values are read from the same clock, which generally only is possible on single socket systems or those with special hardware support. -3.2) TSC and CPU hotplug +3.2. TSC and CPU hotplug +------------------------ As touched on already, CPUs which arrive later than the boot time of the system may not have a TSC value that is synchronized with the rest of the system. @@ -367,7 +382,8 @@ a guarantee. This can have the effect of bringing a system from a state where TSC is synchronized back to a state where TSC synchronization flaws, however small, may be exposed to the OS and any virtualization environment. -3.3) TSC and multi-socket / NUMA +3.3. TSC and multi-socket / NUMA +-------------------------------- Multi-socket systems, especially large multi-socket systems are likely to have individual clocksources rather than a single, universally distributed clock. @@ -385,7 +401,8 @@ standards for telecommunications and computer equipment. It is recommended not to trust the TSCs to remain synchronized on NUMA or multiple socket systems for these reasons. -3.4) TSC and C-states +3.4. TSC and C-states +--------------------- C-states, or idling states of the processor, especially C1E and deeper sleep states may be problematic for TSC as well. The TSC may stop advancing in such @@ -396,7 +413,8 @@ based on CPU and chipset identifications. The TSC in such a case may be corrected by catching it up to a known external clocksource. -3.5) TSC frequency change / P-states +3.5. TSC frequency change / P-states +------------------------------------ To make things slightly more interesting, some CPUs may change frequency. They may or may not run the TSC at the same rate, and because the frequency change @@ -416,14 +434,16 @@ other processors. In such cases, the TSC on halted CPUs could advance faster than that of non-halted processors. AMD Turion processors are known to have this problem. -3.6) TSC and STPCLK / T-states +3.6. TSC and STPCLK / T-states +------------------------------ External signals given to the processor may also have the effect of stopping the TSC. This is typically done for thermal emergency power control to prevent an overheating condition, and typically, there is no way to detect that this condition has happened. -3.7) TSC virtualization - VMX +3.7. TSC virtualization - VMX +----------------------------- VMX provides conditional trapping of RDTSC, RDMSR, WRMSR and RDTSCP instructions, which is enough for full virtualization of TSC in any manner. In @@ -431,14 +451,16 @@ addition, VMX allows passing through the host TSC plus an additional TSC_OFFSET field specified in the VMCS. Special instructions must be used to read and write the VMCS field. -3.8) TSC virtualization - SVM +3.8. TSC virtualization - SVM +----------------------------- SVM provides conditional trapping of RDTSC, RDMSR, WRMSR and RDTSCP instructions, which is enough for full virtualization of TSC in any manner. In addition, SVM allows passing through the host TSC plus an additional offset field specified in the SVM control block. -3.9) TSC feature bits in Linux +3.9. TSC feature bits in Linux +------------------------------ In summary, there is no way to guarantee the TSC remains in perfect synchronization unless it is explicitly guaranteed by the architecture. Even @@ -448,13 +470,16 @@ despite being locally consistent. The following feature bits are used by Linux to signal various TSC attributes, but they can only be taken to be meaningful for UP or single node systems. -X86_FEATURE_TSC : The TSC is available in hardware -X86_FEATURE_RDTSCP : The RDTSCP instruction is available -X86_FEATURE_CONSTANT_TSC : The TSC rate is unchanged with P-states -X86_FEATURE_NONSTOP_TSC : The TSC does not stop in C-states -X86_FEATURE_TSC_RELIABLE : TSC sync checks are skipped (VMware) +========================= ======================================= +X86_FEATURE_TSC The TSC is available in hardware +X86_FEATURE_RDTSCP The RDTSCP instruction is available +X86_FEATURE_CONSTANT_TSC The TSC rate is unchanged with P-states +X86_FEATURE_NONSTOP_TSC The TSC does not stop in C-states +X86_FEATURE_TSC_RELIABLE TSC sync checks are skipped (VMware) +========================= ======================================= -4) Virtualization Problems +4. Virtualization Problems +========================== Timekeeping is especially problematic for virtualization because a number of challenges arise. The most obvious problem is that time is now shared between @@ -473,7 +498,8 @@ BIOS, but not in such an extreme fashion. However, the fact that SMM mode may cause similar problems to virtualization makes it a good justification for solving many of these problems on bare metal. -4.1) Interrupt clocking +4.1. Interrupt clocking +----------------------- One of the most immediate problems that occurs with legacy operating systems is that the system timekeeping routines are often designed to keep track of @@ -502,7 +528,8 @@ thus requires interrupt slewing to keep proper time. It does use a low enough rate (ed: is it 18.2 Hz?) however that it has not yet been a problem in practice. -4.2) TSC sampling and serialization +4.2. TSC sampling and serialization +----------------------------------- As the highest precision time source available, the cycle counter of the CPU has aroused much interest from developers. As explained above, this timer has @@ -524,7 +551,8 @@ it may be necessary for an implementation to guard against "backwards" reads of the TSC as seen from other CPUs, even in an otherwise perfectly synchronized system. -4.3) Timespec aliasing +4.3. Timespec aliasing +---------------------- Additionally, this lack of serialization from the TSC poses another challenge when using results of the TSC when measured against another time source. As @@ -548,7 +576,8 @@ This aliasing requires care in the computation and recalibration of kvmclock and any other values derived from TSC computation (such as TSC virtualization itself). -4.4) Migration +4.4. Migration +-------------- Migration of a virtual machine raises problems for timekeeping in two ways. First, the migration itself may take time, during which interrupts cannot be @@ -566,7 +595,8 @@ always be caught up to the original rate. KVM clock avoids these problems by simply storing multipliers and offsets against the TSC for the guest to convert back into nanosecond resolution values. -4.5) Scheduling +4.5. Scheduling +--------------- Since scheduling may be based on precise timing and firing of interrupts, the scheduling algorithms of an operating system may be adversely affected by @@ -579,7 +609,8 @@ In an attempt to work around this, several implementations have provided a paravirtualized scheduler clock, which reveals the true amount of CPU time for which a virtual machine has been running. -4.6) Watchdogs +4.6. Watchdogs +-------------- Watchdog timers, such as the lock detector in Linux may fire accidentally when running under hardware virtualization due to timer interrupts being delayed or @@ -587,7 +618,8 @@ misinterpretation of the passage of real time. Usually, these warnings are spurious and can be ignored, but in some circumstances it may be necessary to disable such detection. -4.7) Delays and precision timing +4.7. Delays and precision timing +-------------------------------- Precise timing and delays may not be possible in a virtualized system. This can happen if the system is controlling physical hardware, or issues delays to @@ -600,7 +632,8 @@ The second issue may cause performance problems, but this is unlikely to be a significant issue. In many cases these delays may be eliminated through configuration or paravirtualization. -4.8) Covert channels and leaks +4.8. Covert channels and leaks +------------------------------ In addition to the above problems, time information will inevitably leak to the guest about the host in anything but a perfect implementation of virtualized From patchwork Mon Feb 10 06:03:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372535 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0C94492A for ; Mon, 10 Feb 2020 06:03:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E02F224680 for ; Mon, 10 Feb 2020 06:03:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314610; bh=IpnvmWz/8um8W8M0uxPTXbCD1j74QgnZZdtgNPoA8hY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WBka6Blo6zl/WQSCaD4+/pYPvAfnh0+ca5x5LILl4lhe+eiTFhOnrMFY6ww56fqVG gIEr2Hxrze2Dtq38KOpW96sNn1t/ef2tuYF4zkLMifzj2dEFcCjChVHZ9R66Te7lo3 goqmyu/qISeDqtFddSxWV2MNgVyV//7/3Ypsj4UM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727640AbgBJGDV (ORCPT ); Mon, 10 Feb 2020 01:03:21 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36464 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727584AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=3atzUbHUpUbwJ3lq7O6PizLnLBeHoo1f0Hi0KPfYLDo=; b=QJLxhPB5Y0ribOiXGII8xFfdQ8 sIE56jKaoX2Jeo0EjIORZIXvIbRmYWQlqbESHlKzzEJtOejy333Xs5pF0Z+6UIKTKPpntblRi2eD3 GUMuFq+Q0R94hY2UwMrje113SE3CrtFpiJL+fB32rpJ6W6UM9oF+08H0BpXCwMAxxsWLQuQRY1+M6 QNo08+EpRghAiKG1jGi+au9QlYtl5B/bUNFloD1CPQsAwMPP6s3hB8TsiWG8cR9WwgRZ0ERm7wCPy LzuFo1XmnNhnHCm2+TsPNKhZmNnRpZBTYB7WijJJ4heBAVOkKJpEeqQLG3q0PGePCaTJUu/FzvUFt AZl8F61Q==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A5-0006V2-GP; Mon, 10 Feb 2020 06:03:13 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A3-00C2Wk-Pa; Mon, 10 Feb 2020 07:03:11 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Paolo Bonzini , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, Cornelia Huck Subject: [PATCH 27/28] docs: kvm: review-checklist.txt: rename to ReST Date: Mon, 10 Feb 2020 07:03:05 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This file is already in ReST compatible format. So, rename it and add to the kvm's index.rst. While here, use the standard conversion for document titles. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Cornelia Huck --- Documentation/virt/kvm/index.rst | 2 ++ .../virt/kvm/{review-checklist.txt => review-checklist.rst} | 3 +++ 2 files changed, 5 insertions(+) rename Documentation/virt/kvm/{review-checklist.txt => review-checklist.rst} (95%) diff --git a/Documentation/virt/kvm/index.rst b/Documentation/virt/kvm/index.rst index 7c1be8910837..774deaebf7fa 100644 --- a/Documentation/virt/kvm/index.rst +++ b/Documentation/virt/kvm/index.rst @@ -21,6 +21,8 @@ KVM timekeeping vcpu-requests + review-checklist + arm/index devices/index diff --git a/Documentation/virt/kvm/review-checklist.txt b/Documentation/virt/kvm/review-checklist.rst similarity index 95% rename from Documentation/virt/kvm/review-checklist.txt rename to Documentation/virt/kvm/review-checklist.rst index 499af499e296..1f86a9d3f705 100644 --- a/Documentation/virt/kvm/review-checklist.txt +++ b/Documentation/virt/kvm/review-checklist.rst @@ -1,3 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================================ Review checklist for kvm patches ================================ From patchwork Mon Feb 10 06:03:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11372523 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EF67314B4 for ; Mon, 10 Feb 2020 06:03:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CD5C524680 for ; Mon, 10 Feb 2020 06:03:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581314604; bh=qrSFIhXMQQyE2ijiNQgNxgOjRtILB8FazPr0GRSWFDQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zKsSh9JPrlrgYsJO2EspgHU77Lh/50uKZliqOxo/k8s8vdvLz82jI8Y73Trou7h12 gPe69EtB+0aM5dYzyC3p/+EV+zi4y9oDgCMKz81mfeL/QKs4yMSV5/NQy2cfxSQYhQ EvO08PbW9ECkAT7ZJ86P+Q9sHG0jng/YoWwhfoO8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727691AbgBJGDY (ORCPT ); Mon, 10 Feb 2020 01:03:24 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:36470 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727588AbgBJGDN (ORCPT ); Mon, 10 Feb 2020 01:03:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=eNrFz6CRMRgHnFevqnlIWroPTSTbSy2UTpFunBlwins=; b=bpGtW2VUBD7wTMpbCAg9wfg/9T yLcnBTXkANMXsexTKSTXOyzofS6JhqCM88G2oSdWdWmCsiC53Lt9Y01vTeNYMQLEJ0SKCaw2AzfXs M0FfG0LuLGYQWSRAMkKEuqDvdN07NUzVITZyG65CGD7tw6dGy8h5S95cGeemSuV2XsnzMU4yv7eUf sBUL9TqUNYNnS0/gEiC2VzhIpTtFhP8n5ET7O6c7dzHTmQOB5fxYv/hGka7FuRFyhnRYCW9crtDdx ydAuixpAPiW9Ky2/PDhM9ht5o2RBKCdO1TCCUme9pKswyitgx5Wi7p9XC8TJEuwDm8qt88Txty+n2 dxAGdaCg==; Received: from [80.156.29.194] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j12A5-0006V4-GB; Mon, 10 Feb 2020 06:03:13 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92.3) (envelope-from ) id 1j12A3-00C2Wp-Qc; Mon, 10 Feb 2020 07:03:11 +0100 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Jonathan Corbet , linux-doc@vger.kernel.org Subject: [PATCH 28/28] docs: virt: guest-halt-polling.txt convert to ReST Date: Mon, 10 Feb 2020 07:03:06 +0100 Message-Id: X-Mailer: git-send-email 2.24.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Due to some merge conflict, this file ended being alone under Documentation/virtual. The file itself is almost at ReST format. Just minor adjustments are needed: - Adjust title markup; - Adjust a list identation; - add a literal block markup; - Add some blank lines. Signed-off-by: Mauro Carvalho Chehab --- .../guest-halt-polling.rst} | 12 +++++++++--- Documentation/virt/index.rst | 1 + 2 files changed, 10 insertions(+), 3 deletions(-) rename Documentation/{virtual/guest-halt-polling.txt => virt/guest-halt-polling.rst} (91%) diff --git a/Documentation/virtual/guest-halt-polling.txt b/Documentation/virt/guest-halt-polling.rst similarity index 91% rename from Documentation/virtual/guest-halt-polling.txt rename to Documentation/virt/guest-halt-polling.rst index b3a2a294532d..b4e747942417 100644 --- a/Documentation/virtual/guest-halt-polling.txt +++ b/Documentation/virt/guest-halt-polling.rst @@ -1,9 +1,11 @@ +================== Guest halt polling ================== The cpuidle_haltpoll driver, with the haltpoll governor, allows the guest vcpus to poll for a specified amount of time before halting. + This provides the following benefits to host side polling: 1) The POLL flag is set while polling is performed, which allows @@ -29,18 +31,21 @@ Module Parameters The haltpoll governor has 5 tunable module parameters: 1) guest_halt_poll_ns: + Maximum amount of time, in nanoseconds, that polling is performed before halting. Default: 200000 2) guest_halt_poll_shrink: + Division factor used to shrink per-cpu guest_halt_poll_ns when wakeup event occurs after the global guest_halt_poll_ns. Default: 2 3) guest_halt_poll_grow: + Multiplication factor used to grow per-cpu guest_halt_poll_ns when event occurs after per-cpu guest_halt_poll_ns but before global guest_halt_poll_ns. @@ -48,6 +53,7 @@ but before global guest_halt_poll_ns. Default: 2 4) guest_halt_poll_grow_start: + The per-cpu guest_halt_poll_ns eventually reaches zero in case of an idle system. This value sets the initial per-cpu guest_halt_poll_ns when growing. This can @@ -66,7 +72,7 @@ high once achieves global guest_halt_poll_ns value). Default: Y -The module parameters can be set from the debugfs files in: +The module parameters can be set from the debugfs files in:: /sys/module/haltpoll/parameters/ @@ -74,5 +80,5 @@ Further Notes ============= - Care should be taken when setting the guest_halt_poll_ns parameter as a -large value has the potential to drive the cpu usage to 100% on a machine which -would be almost entirely idle otherwise. + large value has the potential to drive the cpu usage to 100% on a machine + which would be almost entirely idle otherwise. diff --git a/Documentation/virt/index.rst b/Documentation/virt/index.rst index 0a8f7fda64ad..de1ab81df958 100644 --- a/Documentation/virt/index.rst +++ b/Documentation/virt/index.rst @@ -10,6 +10,7 @@ Linux Virtualization Support kvm/index uml/user_mode_linux paravirt_ops + guest-halt-polling .. only:: html and subproject