From patchwork Fri May 17 12:58:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Freimann X-Patchwork-Id: 10947955 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 34BA613AD for ; Fri, 17 May 2019 13:00:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 23239266F3 for ; Fri, 17 May 2019 13:00:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 17AA1279E0; Fri, 17 May 2019 13:00:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7F669268AE for ; Fri, 17 May 2019 13:00:02 +0000 (UTC) Received: from localhost ([127.0.0.1]:48249 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hRcSv-0001LK-SK for patchwork-qemu-devel@patchwork.kernel.org; Fri, 17 May 2019 09:00:01 -0400 Received: from eggs.gnu.org ([209.51.188.92]:52665) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hRcRp-0000TA-24 for qemu-devel@nongnu.org; Fri, 17 May 2019 08:58:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hRcRn-0003EO-OP for qemu-devel@nongnu.org; Fri, 17 May 2019 08:58:53 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42754) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hRcRn-0002x8-GU for qemu-devel@nongnu.org; Fri, 17 May 2019 08:58:51 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E52673092654 for ; Fri, 17 May 2019 12:58:37 +0000 (UTC) Received: from localhost (dhcp-192-241.str.redhat.com [10.33.192.241]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4012A5D6A9; Fri, 17 May 2019 12:58:35 +0000 (UTC) From: Jens Freimann To: qemu-devel@nongnu.org Date: Fri, 17 May 2019 14:58:18 +0200 Message-Id: <20190517125820.2885-3-jfreimann@redhat.com> In-Reply-To: <20190517125820.2885-1-jfreimann@redhat.com> References: <20190517125820.2885-1-jfreimann@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Fri, 17 May 2019 12:58:37 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 2/4] qdev/qbus: Add hidden device support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pkrempa@redhat.com, berrange@redhat.com, ehabkost@redhat.com, mst@redhat.com, aadam@redhat.com, laine@redhat.com, ailan@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This adds support for hiding a device to the qbus and qdev APIs. qdev_device_add() is modified to check for a standby argument in the option string. A DeviceListener callback should_be_hidden() is added. It can be used by a standby device to inform qdev that this device should not be added now. The standby device handler can store the device options to plug the device in at a later point in time. Signed-off-by: Jens Freimann --- hw/core/qdev.c | 19 +++++++++++++++++++ hw/vfio/pci.c | 1 + hw/vfio/pci.h | 1 + include/hw/qdev-core.h | 9 +++++++++ qdev-monitor.c | 41 ++++++++++++++++++++++++++++++++++++++--- vl.c | 6 ++++-- 6 files changed, 72 insertions(+), 5 deletions(-) diff --git a/hw/core/qdev.c b/hw/core/qdev.c index 98cdaa6bf7..d55fe00ae7 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -211,6 +211,25 @@ void device_listener_unregister(DeviceListener *listener) QTAILQ_REMOVE(&device_listeners, listener, link); } +bool qdev_should_hide_device(QemuOpts *opts, Error **errp) +{ + bool res = false; + bool match_found = false; + + DeviceListener *listener; + + QTAILQ_FOREACH(listener, &device_listeners, link) { + if (listener->should_be_hidden) { + listener->should_be_hidden(listener, opts, &match_found, &res); + } + + if (match_found) { + break; + } + } + return res; +} + void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id, int required_for_version) { diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 8cecb53d5c..835249c61d 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3215,6 +3215,7 @@ static Property vfio_pci_dev_properties[] = { display, ON_OFF_AUTO_OFF), DEFINE_PROP_UINT32("xres", VFIOPCIDevice, display_xres, 0), DEFINE_PROP_UINT32("yres", VFIOPCIDevice, display_yres, 0), + DEFINE_PROP_STRING("standby", VFIOPCIDevice, standby), DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice, intx.mmap_timeout, 1100), DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features, diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index cfcd1a81b8..1a87f91889 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -135,6 +135,7 @@ typedef struct VFIOPCIDevice { PCIHostDeviceAddress host; EventNotifier err_notifier; EventNotifier req_notifier; + char *standby; int (*resetfn)(struct VFIOPCIDevice *); uint32_t vendor_id; uint32_t device_id; diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 5437395779..d54d3ae62a 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -158,6 +158,13 @@ struct DeviceState { struct DeviceListener { void (*realize)(DeviceListener *listener, DeviceState *dev); void (*unrealize)(DeviceListener *listener, DeviceState *dev); + /* + * This callback is called just upon init of the DeviceState + * and can be used by a standby device for informing qdev if this + * device should be hidden by checking the device opts + */ + void (*should_be_hidden)(DeviceListener *listener, QemuOpts *device_opts, + bool *match_found, bool *res); QTAILQ_ENTRY(DeviceListener) link; }; @@ -454,4 +461,6 @@ static inline bool qbus_is_hotpluggable(BusState *bus) void device_listener_register(DeviceListener *listener); void device_listener_unregister(DeviceListener *listener); +bool qdev_should_hide_device(QemuOpts *opts, Error **errp); + #endif diff --git a/qdev-monitor.c b/qdev-monitor.c index 9cce8b93c2..a81226529a 100644 --- a/qdev-monitor.c +++ b/qdev-monitor.c @@ -32,8 +32,10 @@ #include "qemu/help_option.h" #include "qemu/option.h" #include "qemu/qemu-print.h" +#include "qemu/option_int.h" #include "sysemu/block-backend.h" #include "migration/misc.h" +#include "migration/migration.h" /* * Aliases were a bad idea from the start. Let's keep them @@ -561,14 +563,45 @@ void qdev_set_id(DeviceState *dev, const char *id) } } +static int is_failover_device(void *opaque, const char *name, const char *value, + Error **errp) +{ + if (strcmp(name, "standby") == 0) { + QemuOpts *opts = (QemuOpts *)opaque; + + if (qdev_should_hide_device(opts, errp) && errp && !*errp) { + return 1; + } else if (errp && *errp) { + return -1; + } + } + + return 0; +} + +static bool should_hide_device(QemuOpts *opts, Error **err) +{ + if (qemu_opt_foreach(opts, is_failover_device, opts, err) == 0) { + return false; + } + return true; +} + DeviceState *qdev_device_add(QemuOpts *opts, Error **errp) { DeviceClass *dc; const char *driver, *path; - DeviceState *dev; + DeviceState *dev = NULL; BusState *bus = NULL; Error *err = NULL; + if (opts && should_hide_device(opts, &err)) { + if (err) { + goto err_del_dev; + } + return NULL; + } + driver = qemu_opt_get(opts, "driver"); if (!driver) { error_setg(errp, QERR_MISSING_PARAMETER, "driver"); @@ -640,8 +673,10 @@ DeviceState *qdev_device_add(QemuOpts *opts, Error **errp) err_del_dev: error_propagate(errp, err); - object_unparent(OBJECT(dev)); - object_unref(OBJECT(dev)); + if (dev) { + object_unparent(OBJECT(dev)); + object_unref(OBJECT(dev)); + } return NULL; } diff --git a/vl.c b/vl.c index b6709514c1..4b5b878275 100644 --- a/vl.c +++ b/vl.c @@ -2355,10 +2355,12 @@ static int device_init_func(void *opaque, QemuOpts *opts, Error **errp) DeviceState *dev; dev = qdev_device_add(opts, errp); - if (!dev) { + if (!dev && *errp) { + error_report_err(*errp); return -1; + } else if (dev) { + object_unref(OBJECT(dev)); } - object_unref(OBJECT(dev)); return 0; }