From patchwork Fri Feb 16 13:16:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dr. David Alan Gilbert" X-Patchwork-Id: 10224691 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3A366601E7 for ; Fri, 16 Feb 2018 13:24:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 26ECC28418 for ; Fri, 16 Feb 2018 13:24:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 19548293D6; Fri, 16 Feb 2018 13:24:47 +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=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_HK_NAME_DR autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 87C3528418 for ; Fri, 16 Feb 2018 13:24:46 +0000 (UTC) Received: from localhost ([::1]:48216 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1emg0L-000845-KF for patchwork-qemu-devel@patchwork.kernel.org; Fri, 16 Feb 2018 08:24:45 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51702) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1emfsT-0001E8-DL for qemu-devel@nongnu.org; Fri, 16 Feb 2018 08:16:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1emfsR-0005d2-VU for qemu-devel@nongnu.org; Fri, 16 Feb 2018 08:16:37 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:34846 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1emfsR-0005cc-Q4 for qemu-devel@nongnu.org; Fri, 16 Feb 2018 08:16:35 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 71F58407519B for ; Fri, 16 Feb 2018 13:16:35 +0000 (UTC) Received: from dgilbert-t530.redhat.com (unknown [10.36.118.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id 43E0B213AEE2; Fri, 16 Feb 2018 13:16:34 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, maxime.coquelin@redhat.com, marcandre.lureau@redhat.com, peterx@redhat.com, imammedo@redhat.com, mst@redhat.com Date: Fri, 16 Feb 2018 13:16:01 +0000 Message-Id: <20180216131625.9639-6-dgilbert@redhat.com> In-Reply-To: <20180216131625.9639-1-dgilbert@redhat.com> References: <20180216131625.9639-1-dgilbert@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 16 Feb 2018 13:16:35 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 16 Feb 2018 13:16:35 +0000 (UTC) for IP:'10.11.54.6' DOMAIN:'int-mx06.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'dgilbert@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v3 05/29] postcopy: Add vhost-user flag for postcopy and check it 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: aarcange@redhat.com, quintela@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: "Dr. David Alan Gilbert" Add a vhost feature flag for postcopy support, and use the postcopy notifier to check it before allowing postcopy. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Peter Xu --- contrib/libvhost-user/libvhost-user.h | 1 + docs/interop/vhost-user.txt | 10 +++++++++ hw/virtio/vhost-user.c | 41 ++++++++++++++++++++++++++++++++++- 3 files changed, 51 insertions(+), 1 deletion(-) diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/libvhost-user.h index 18f95f65d7..a0dcc97c73 100644 --- a/contrib/libvhost-user/libvhost-user.h +++ b/contrib/libvhost-user/libvhost-user.h @@ -48,6 +48,7 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_NET_MTU = 4, VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5, VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6, + VHOST_USER_PROTOCOL_F_PAGEFAULT = 7, VHOST_USER_PROTOCOL_F_MAX }; diff --git a/docs/interop/vhost-user.txt b/docs/interop/vhost-user.txt index 9fcf48d611..e95cd82677 100644 --- a/docs/interop/vhost-user.txt +++ b/docs/interop/vhost-user.txt @@ -290,6 +290,15 @@ Once the source has finished migration, rings will be stopped by the source. No further update must be done before rings are restarted. +In postcopy migration the slave is started before all the memory has been +received from the source host, and care must be taken to avoid accessing pages +that have yet to be received. The slave opens a 'userfault'-fd and registers +the memory with it; this fd is then passed back over to the master. +The master services requests on the userfaultfd for pages that are accessed +and when the page is available it performs WAKE ioctl's on the userfaultfd +to wake the stalled slave. The client indicates support for this via the +VHOST_USER_PROTOCOL_F_PAGEFAULT feature. + Memory access ------------- @@ -368,6 +377,7 @@ Protocol features #define VHOST_USER_PROTOCOL_F_MTU 4 #define VHOST_USER_PROTOCOL_F_SLAVE_REQ 5 #define VHOST_USER_PROTOCOL_F_CROSS_ENDIAN 6 +#define VHOST_USER_PROTOCOL_F_PAGEFAULT 7 Master message types -------------------- diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 6eb97980ad..d60f89cc16 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -17,6 +17,8 @@ #include "sysemu/kvm.h" #include "qemu/error-report.h" #include "qemu/sockets.h" +#include "migration/migration.h" +#include "migration/postcopy-ram.h" #include #include @@ -39,7 +41,7 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_NET_MTU = 4, VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5, VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6, - + VHOST_USER_PROTOCOL_F_PAGEFAULT = 7, VHOST_USER_PROTOCOL_F_MAX }; @@ -148,8 +150,10 @@ static VhostUserMsg m __attribute__ ((unused)); #define VHOST_USER_VERSION (0x1) struct vhost_user { + struct vhost_dev *dev; CharBackend *chr; int slave_fd; + NotifierWithReturn postcopy_notifier; }; static bool ioeventfd_enabled(void) @@ -775,6 +779,33 @@ out: return ret; } +static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier, + void *opaque) +{ + struct PostcopyNotifyData *pnd = opaque; + struct vhost_user *u = container_of(notifier, struct vhost_user, + postcopy_notifier); + struct vhost_dev *dev = u->dev; + + switch (pnd->reason) { + case POSTCOPY_NOTIFY_PROBE: + if (!virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_PAGEFAULT)) { + /* TODO: Get the device name into this error somehow */ + error_setg(pnd->errp, + "vhost-user backend not capable of postcopy"); + return -ENOENT; + } + break; + + default: + /* We ignore notifications we don't know */ + break; + } + + return 0; +} + static int vhost_user_init(struct vhost_dev *dev, void *opaque) { uint64_t features, protocol_features; @@ -786,6 +817,7 @@ static int vhost_user_init(struct vhost_dev *dev, void *opaque) u = g_new0(struct vhost_user, 1); u->chr = opaque; u->slave_fd = -1; + u->dev = dev; dev->opaque = u; err = vhost_user_get_features(dev, &features); @@ -842,6 +874,9 @@ static int vhost_user_init(struct vhost_dev *dev, void *opaque) return err; } + u->postcopy_notifier.notify = vhost_user_postcopy_notifier; + postcopy_add_notifier(&u->postcopy_notifier); + return 0; } @@ -852,6 +887,10 @@ static int vhost_user_cleanup(struct vhost_dev *dev) assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); u = dev->opaque; + if (u->postcopy_notifier.notify) { + postcopy_remove_notifier(&u->postcopy_notifier); + u->postcopy_notifier.notify = NULL; + } if (u->slave_fd >= 0) { qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL); close(u->slave_fd);