From nobody Tue Feb 10 17:51:17 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=yandex-team.ru ARC-Seal: i=1; a=rsa-sha256; t=1768218424; cv=none; d=zohomail.com; s=zohoarc; b=f9bHfJe7YztM7SAQVDkarW0snRNv534cJBXeQgKNTEEAQs/CGnsDVmm1YKSFZH52bF/OHAmq2r9jKJhLUF0aA3dfZIbIVZrENI8bT/xgvo4Z9wAP9XSFHGwhl6CPucZbCVqizGQxKFUU3FbiF44xmTVICCKwHeCpcwfH+/3WWd4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1768218424; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=ZAd/Fxgvks8ojlWBXFbKSd9KMAVUVGhazsRwe+yiqKM=; b=lyeRClefQnXX2MiKW3SidF+MGAVit0bo5SfGfdgiJy9f73sQ70lTM0n6rd1JHFgt/rvfCfYQAnJWwlzTfPJknpsFBckK6I/+zpK17I71bLxbkk7p7DwNcP6wJLhxmtLBVPEbFTL38QCIQhIgbhRlMotdebndtmEf4UbHnHqGzAU= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1768218424877753.9572647014164; Mon, 12 Jan 2026 03:47:04 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfGMZ-0007Mk-QQ; Mon, 12 Jan 2026 06:45:41 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMR-0007Li-K5; Mon, 12 Jan 2026 06:45:28 -0500 Received: from forwardcorp1b.mail.yandex.net ([178.154.239.136]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMP-0004m7-Ko; Mon, 12 Jan 2026 06:45:26 -0500 Received: from mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net [IPv6:2a02:6b8:c24:fa2:0:640:41ee:0]) by forwardcorp1b.mail.yandex.net (Yandex) with ESMTPS id E4E0E807C1; Mon, 12 Jan 2026 14:45:22 +0300 (MSK) Received: from dtalexundeer-nx.yandex.net (unknown [2a02:6bf:803e:400:6fcf:dbb2:9b0:d80b]) by mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id 6jQQPI5AAW20-w3URuCxH; Mon, 12 Jan 2026 14:45:22 +0300 Precedence: bulk X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1768218322; bh=ZAd/Fxgvks8ojlWBXFbKSd9KMAVUVGhazsRwe+yiqKM=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=f0wVyGT775CYSb3dLt3VHzeGV1/bcDILtj7KG+qJO3fypGzhYYu9GzKD4zw9dp1V9 HTPM6mEiO9RtjVoHZ7wzxvNUdzc5xPdyCN0X8JcDJ0xsbT4satDks1elfDMxgAM0IX SVMOvHjxDalxS/tUIHUFhqsPxhvNiP9ZnR30XGVs= Authentication-Results: mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Alexandr Moshkov To: qemu-devel@nongnu.org Cc: "Gonglei (Arei)" , Zhenwei Pi , "Michael S. Tsirkin" , Stefano Garzarella , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Jason Wang , Paolo Bonzini , Fam Zheng , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Stefan Hajnoczi , mzamazal@redhat.com, Peter Xu , Fabiano Rosas , qemu-block@nongnu.org, virtio-fs@lists.linux.dev, "yc-core@yandex-team.ru" , Eric Blake , Markus Armbruster , Alexandr Moshkov Subject: [PATCH v5 1/5] vhost-user.rst: specify vhost-user back-end action on GET_VRING_BASE Date: Mon, 12 Jan 2026 16:44:59 +0500 Message-Id: <20260112114503.1174330-2-dtalexundeer@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> References: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=178.154.239.136; envelope-from=dtalexundeer@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1768218426748158500 Content-Type: text/plain; charset="utf-8" By default, we assume that server need to wait all inflight IO on GET_VRING_BASE. However, this fact is not recorded anywhere in the documentation. So, add this info in rst. Signed-off-by: Alexandr Moshkov --- docs/interop/vhost-user.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 2e50f2ddfa..02908b48fa 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -1243,7 +1243,8 @@ Front-end message types =20 When and as long as all of a device's vrings are stopped, it is *suspended*, see :ref:`Suspended device state - `. + `. The back-end must complete all inflight I/O + requests for the specified vring before stopping it. =20 The request payload's *num* field is currently reserved and must be set to 0. --=20 2.34.1 From nobody Tue Feb 10 17:51:17 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=yandex-team.ru ARC-Seal: i=1; a=rsa-sha256; t=1768218424; cv=none; d=zohomail.com; s=zohoarc; b=IVObErVzK655XJuVSX9pvCKkGPmJ0QCw5BUbXEisxVnWEMZoXbHWc7Z+plOC/k5bxP7jkdW8sLUwGAyaUUODXH6+q5UMulY0Hc3ir4w13xEQ+BhGT+1lmYQfPg75GFi8wnpArg2A5D8tWNJZbZVO6D4EvYcJVqiAT4wUncQi55I= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1768218424; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=HdyqLoPPJV/dgq0szMV+tcZby7MpNxKn6fP7roWRik8=; b=UiLchT5jyENuVG4yaiBiiOJF0qwin691y40RNwK+MUy+gdksmXADuVz4lHYlTVKLNunLqOS11EI9pbBysv/Iq/FYHVNy9Mbv4l3SZ/rVOTPJLTdzYrp5VyC/nyw66c6Rnu67mu6SMRxkD8t9P1bNK7y6GLJdgCrgnTKCPuj2qmQ= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1768218424203669.1126014122225; Mon, 12 Jan 2026 03:47:04 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfGMp-0007TI-RS; Mon, 12 Jan 2026 06:45:51 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMT-0007M4-DZ; Mon, 12 Jan 2026 06:45:29 -0500 Received: from forwardcorp1b.mail.yandex.net ([2a02:6b8:c02:900:1:45:d181:df01]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMR-0004mw-Mi; Mon, 12 Jan 2026 06:45:29 -0500 Received: from mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net [IPv6:2a02:6b8:c24:fa2:0:640:41ee:0]) by forwardcorp1b.mail.yandex.net (Yandex) with ESMTPS id 05DC98080A; Mon, 12 Jan 2026 14:45:26 +0300 (MSK) Received: from dtalexundeer-nx.yandex.net (unknown [2a02:6bf:803e:400:6fcf:dbb2:9b0:d80b]) by mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id 6jQQPI5AAW20-fY8FuAQa; Mon, 12 Jan 2026 14:45:25 +0300 Precedence: bulk X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1768218325; bh=HdyqLoPPJV/dgq0szMV+tcZby7MpNxKn6fP7roWRik8=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=fCdTPJj9fOlUtsIKT3WZhBQwxpotlgCAxOKLv6+yI8OPHIgyDaJ/4sw++Y4E9Iskt 566S08oGZ2fw9jtuGxREsvELOg6LrEekYQ7D388d76FyeJv3guRBmW5G7nb4WJJgBg ecVqjuCBuU5g3C6XMCdKRNua2uz+VDBYgyrrvXXo= Authentication-Results: mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Alexandr Moshkov To: qemu-devel@nongnu.org Cc: "Gonglei (Arei)" , Zhenwei Pi , "Michael S. Tsirkin" , Stefano Garzarella , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Jason Wang , Paolo Bonzini , Fam Zheng , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Stefan Hajnoczi , mzamazal@redhat.com, Peter Xu , Fabiano Rosas , qemu-block@nongnu.org, virtio-fs@lists.linux.dev, "yc-core@yandex-team.ru" , Eric Blake , Markus Armbruster , Alexandr Moshkov Subject: [PATCH v5 2/5] vhost-user: introduce protocol feature for skip drain on GET_VRING_BASE Date: Mon, 12 Jan 2026 16:45:00 +0500 Message-Id: <20260112114503.1174330-3-dtalexundeer@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> References: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a02:6b8:c02:900:1:45:d181:df01; envelope-from=dtalexundeer@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1768218424639158500 Content-Type: text/plain; charset="utf-8" Add vhost-user protocol feature VHOST_USER_PROTOCOL_F_GET_VRING_BASE_INFLIGHT Now on GET_VRING_BASE this feature can control whether to wait for in-flight requests to complete or not. It will be helpfull in future for in-flight requests migration in vhost-user devices. Signed-off-by: Alexandr Moshkov --- docs/interop/vhost-user.rst | 52 ++++++++++++++++++---------------- include/hw/virtio/vhost-user.h | 1 + 2 files changed, 29 insertions(+), 24 deletions(-) diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 02908b48fa..80c80aada5 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -1033,26 +1033,27 @@ Protocol features =20 .. code:: c =20 - #define VHOST_USER_PROTOCOL_F_MQ 0 - #define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1 - #define VHOST_USER_PROTOCOL_F_RARP 2 - #define VHOST_USER_PROTOCOL_F_REPLY_ACK 3 - #define VHOST_USER_PROTOCOL_F_MTU 4 - #define VHOST_USER_PROTOCOL_F_BACKEND_REQ 5 - #define VHOST_USER_PROTOCOL_F_CROSS_ENDIAN 6 - #define VHOST_USER_PROTOCOL_F_CRYPTO_SESSION 7 - #define VHOST_USER_PROTOCOL_F_PAGEFAULT 8 - #define VHOST_USER_PROTOCOL_F_CONFIG 9 - #define VHOST_USER_PROTOCOL_F_BACKEND_SEND_FD 10 - #define VHOST_USER_PROTOCOL_F_HOST_NOTIFIER 11 - #define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12 - #define VHOST_USER_PROTOCOL_F_RESET_DEVICE 13 - #define VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS 14 - #define VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS 15 - #define VHOST_USER_PROTOCOL_F_STATUS 16 - #define VHOST_USER_PROTOCOL_F_XEN_MMAP 17 - #define VHOST_USER_PROTOCOL_F_SHARED_OBJECT 18 - #define VHOST_USER_PROTOCOL_F_DEVICE_STATE 19 + #define VHOST_USER_PROTOCOL_F_MQ 0 + #define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1 + #define VHOST_USER_PROTOCOL_F_RARP 2 + #define VHOST_USER_PROTOCOL_F_REPLY_ACK 3 + #define VHOST_USER_PROTOCOL_F_MTU 4 + #define VHOST_USER_PROTOCOL_F_BACKEND_REQ 5 + #define VHOST_USER_PROTOCOL_F_CROSS_ENDIAN 6 + #define VHOST_USER_PROTOCOL_F_CRYPTO_SESSION 7 + #define VHOST_USER_PROTOCOL_F_PAGEFAULT 8 + #define VHOST_USER_PROTOCOL_F_CONFIG 9 + #define VHOST_USER_PROTOCOL_F_BACKEND_SEND_FD 10 + #define VHOST_USER_PROTOCOL_F_HOST_NOTIFIER 11 + #define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12 + #define VHOST_USER_PROTOCOL_F_RESET_DEVICE 13 + #define VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS 14 + #define VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS 15 + #define VHOST_USER_PROTOCOL_F_STATUS 16 + #define VHOST_USER_PROTOCOL_F_XEN_MMAP 17 + #define VHOST_USER_PROTOCOL_F_SHARED_OBJECT 18 + #define VHOST_USER_PROTOCOL_F_DEVICE_STATE 19 + #define VHOST_USER_PROTOCOL_F_GET_VRING_BASE_INFLIGHT 20 =20 Front-end message types ----------------------- @@ -1243,11 +1244,14 @@ Front-end message types =20 When and as long as all of a device's vrings are stopped, it is *suspended*, see :ref:`Suspended device state - `. The back-end must complete all inflight I/O - requests for the specified vring before stopping it. + `. =20 - The request payload's *num* field is currently reserved and must be - set to 0. + By default, the back-end must complete all inflight I/O requests for the + specified vring before stopping it. + + If the ``VHOST_USER_PROTOCOL_F_GET_VRING_BASE_INFLIGHT`` protocol feature + has been negotiated, the back-end may stop the vring immediately without + waiting for inflight I/O requests to complete. =20 ``VHOST_USER_SET_VRING_KICK`` :id: 12 diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h index fb89268de2..493fbce8b1 100644 --- a/include/hw/virtio/vhost-user.h +++ b/include/hw/virtio/vhost-user.h @@ -33,6 +33,7 @@ enum VhostUserProtocolFeature { /* Feature 17 reserved for VHOST_USER_PROTOCOL_F_XEN_MMAP. */ VHOST_USER_PROTOCOL_F_SHARED_OBJECT =3D 18, VHOST_USER_PROTOCOL_F_DEVICE_STATE =3D 19, + VHOST_USER_PROTOCOL_F_GET_VRING_BASE_INFLIGHT =3D 20, VHOST_USER_PROTOCOL_F_MAX }; =20 --=20 2.34.1 From nobody Tue Feb 10 17:51:17 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=yandex-team.ru ARC-Seal: i=1; a=rsa-sha256; t=1768218422; cv=none; d=zohomail.com; s=zohoarc; b=NogEiadAfmUWtc7bIVZVC2oPOvCRRGQ5f06utrQyPzI55LQnwroTbhraeG5elNwqs8OIRhxjxtZceNaP+OtTYH/8cobHKPUELk0hZ3UwmkxgJ0xyOFP/L44SHadZhhgv9luR2Y6bnQpIt7eHJ7dZgxe9AOwHHH9mn0ghb1VHu64= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1768218422; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=OuFWa9+MzavqJkI10h1F+5VsTtN4q5muV91G/8fFCZo=; b=bMz/8iW32apalzer4J/Xxz6lVQjLCiVV0FgztsMtc+w11r85szx4EqhfJh3H/BV3+NseiXJSBOkHxRnvB0Xnhqoiq2aJ7bNLgsCAuL9v8jRvLndI4mCLU2HJC0Izi07V3XxVcBvsM5hM+jE/RDb7DSCUlWW6Ek26rJISaiFiCS0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1768218422484871.0778811981544; Mon, 12 Jan 2026 03:47:02 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfGMs-0007VM-Q1; Mon, 12 Jan 2026 06:45:54 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMV-0007Mr-P2; Mon, 12 Jan 2026 06:45:35 -0500 Received: from forwardcorp1b.mail.yandex.net ([2a02:6b8:c02:900:1:45:d181:df01]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMU-0004nB-8E; Mon, 12 Jan 2026 06:45:31 -0500 Received: from mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net [IPv6:2a02:6b8:c24:fa2:0:640:41ee:0]) by forwardcorp1b.mail.yandex.net (Yandex) with ESMTPS id 8BA8B80809; Mon, 12 Jan 2026 14:45:28 +0300 (MSK) Received: from dtalexundeer-nx.yandex.net (unknown [2a02:6bf:803e:400:6fcf:dbb2:9b0:d80b]) by mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id 6jQQPI5AAW20-YNq35SCM; Mon, 12 Jan 2026 14:45:27 +0300 Precedence: bulk X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1768218328; bh=OuFWa9+MzavqJkI10h1F+5VsTtN4q5muV91G/8fFCZo=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=e6wmly16BEbGOQQVRGkU3FvAzTshHnEvmvmYPGhqXXzq45seztlShJTjFGMLp43DB oBlIaBKM6+CQuJp01KpOzQ1UG4EDIp/Xel+SXCpaHk4XoE8/9iKyZJaSR6T4Mdz5AJ 418CWcUJLTEG6Q3XP7OkHcZLis6p6+c7olQEHRgA= Authentication-Results: mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Alexandr Moshkov To: qemu-devel@nongnu.org Cc: "Gonglei (Arei)" , Zhenwei Pi , "Michael S. Tsirkin" , Stefano Garzarella , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Jason Wang , Paolo Bonzini , Fam Zheng , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Stefan Hajnoczi , mzamazal@redhat.com, Peter Xu , Fabiano Rosas , qemu-block@nongnu.org, virtio-fs@lists.linux.dev, "yc-core@yandex-team.ru" , Eric Blake , Markus Armbruster , Alexandr Moshkov Subject: [PATCH v5 3/5] vmstate: introduce VMSTATE_VBUFFER_UINT64 Date: Mon, 12 Jan 2026 16:45:01 +0500 Message-Id: <20260112114503.1174330-4-dtalexundeer@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> References: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a02:6b8:c02:900:1:45:d181:df01; envelope-from=dtalexundeer@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1768218424580158500 Content-Type: text/plain; charset="utf-8" This is an analog of VMSTATE_VBUFFER_UINT32 macro, but for uint64 type. Signed-off-by: Alexandr Moshkov --- include/migration/vmstate.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h index 7f1f1c166a..4c9e212d58 100644 --- a/include/migration/vmstate.h +++ b/include/migration/vmstate.h @@ -707,6 +707,16 @@ extern const VMStateInfo vmstate_info_qlist; .offset =3D offsetof(_state, _field), \ } =20 +#define VMSTATE_VBUFFER_UINT64(_field, _state, _version, _test, _field_siz= e) { \ + .name =3D (stringify(_field)), \ + .version_id =3D (_version), \ + .field_exists =3D (_test), \ + .size_offset =3D vmstate_offset_value(_state, _field_size, uint64_t),\ + .info =3D &vmstate_info_buffer, \ + .flags =3D VMS_VBUFFER | VMS_POINTER, \ + .offset =3D offsetof(_state, _field), \ +} + #define VMSTATE_VBUFFER_ALLOC_UINT32(_field, _state, _version, \ _test, _field_size) { \ .name =3D (stringify(_field)), \ --=20 2.34.1 From nobody Tue Feb 10 17:51:17 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=yandex-team.ru ARC-Seal: i=1; a=rsa-sha256; t=1768218427; cv=none; d=zohomail.com; s=zohoarc; b=WtkDI3QVf04LOvjjVl2TMtC2DuKrTY2vW29L9JeHcs9r92SKgEpsJJiU6yIEen8dTxKpR5MSpQCSkpC4pUY5gbKKDFa5Oo3VIkYcE7yy3J8iOkFue0o/ZK4L+Lzq8bCdOSIKH6Zrr2V4bG2p/ImGERggBilftkWLhp4BW0i42zU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1768218427; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=z8PGdUQGuutXpE5KQ/Zomo9S+sDSgjZY1LOIsQYZrpI=; b=i5WlGZOYjQr7/r2Ci/IWyMf9ietX8X1WtjjjX1qj7GCbaN8Go9AkUMqhMIT/+DdElQ4MjG5nUY9eH4Ycli0TPWPccga33XfCbAH+dZ2KK0Gb/3HLYfCemyFrR1ITB1Q+Nw/7yvaOqsd2dMgd7nF6TTVUvj74f7Zx1z6biv3qLHg= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 176821842757975.75028580306582; Mon, 12 Jan 2026 03:47:07 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vfGMt-0007W3-Cn; Mon, 12 Jan 2026 06:45:55 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMZ-0007NK-9W; Mon, 12 Jan 2026 06:45:35 -0500 Received: from forwardcorp1b.mail.yandex.net ([178.154.239.136]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vfGMX-0004nb-37; Mon, 12 Jan 2026 06:45:34 -0500 Received: from mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net [IPv6:2a02:6b8:c24:fa2:0:640:41ee:0]) by forwardcorp1b.mail.yandex.net (Yandex) with ESMTPS id 35C48885CF; Mon, 12 Jan 2026 14:45:31 +0300 (MSK) Received: from dtalexundeer-nx.yandex.net (unknown [2a02:6bf:803e:400:6fcf:dbb2:9b0:d80b]) by mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id 6jQQPI5AAW20-VkRKLOIh; Mon, 12 Jan 2026 14:45:30 +0300 Precedence: bulk X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1768218330; bh=z8PGdUQGuutXpE5KQ/Zomo9S+sDSgjZY1LOIsQYZrpI=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=LmDKMe3wTln9h3nZBQEMkxhuMIFKR7qr4HlyUdPKEe6IfuuK92TRKLVcWlwYpInw9 +aLgpVgnQTURHmpAJg50T9GPAD0BGargW4gvAMLDgYsHhoWJMPQ7iRBvxSGkhgZJwl 461asNhsmftuDoLYhYScaCvWkXN4s1E/d8j8s4v8= Authentication-Results: mail-nwsmtp-smtp-corp-main-34.sas.yp-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Alexandr Moshkov To: qemu-devel@nongnu.org Cc: "Gonglei (Arei)" , Zhenwei Pi , "Michael S. Tsirkin" , Stefano Garzarella , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Jason Wang , Paolo Bonzini , Fam Zheng , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Stefan Hajnoczi , mzamazal@redhat.com, Peter Xu , Fabiano Rosas , qemu-block@nongnu.org, virtio-fs@lists.linux.dev, "yc-core@yandex-team.ru" , Eric Blake , Markus Armbruster , Alexandr Moshkov Subject: [PATCH v5 4/5] vhost: add vmstate for inflight region with inner buffer Date: Mon, 12 Jan 2026 16:45:02 +0500 Message-Id: <20260112114503.1174330-5-dtalexundeer@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> References: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=178.154.239.136; envelope-from=dtalexundeer@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1768218428407158500 Content-Type: text/plain; charset="utf-8" Prepare for future inflight region migration for vhost-user-blk. We need to migrate size, queue_size, and inner buffer. So firstly it migrate size and queue_size fields, then allocate memory for = buffer with migrated size, then migrate inner buffer itself. Signed-off-by: Alexandr Moshkov --- hw/virtio/vhost.c | 42 +++++++++++++++++++++++++++++++++++++++ include/hw/virtio/vhost.h | 6 ++++++ 2 files changed, 48 insertions(+) diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index c46203eb9c..9a746c9861 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -2028,6 +2028,48 @@ const VMStateDescription vmstate_backend_transfer_vh= ost_inflight =3D { } }; =20 +static int vhost_inflight_buffer_pre_load(void *opaque, Error **errp) +{ + info_report("vhost_inflight_region_buffer_pre_load"); + struct vhost_inflight *inflight =3D opaque; + + int fd =3D -1; + void *addr =3D qemu_memfd_alloc("vhost-inflight", inflight->size, + F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEA= L, + &fd, errp); + if (*errp) { + return -ENOMEM; + } + + inflight->offset =3D 0; + inflight->addr =3D addr; + inflight->fd =3D fd; + + return 0; +} + +const VMStateDescription vmstate_vhost_inflight_region_buffer =3D { + .name =3D "vhost-inflight-region/buffer", + .pre_load_errp =3D vhost_inflight_buffer_pre_load, + .fields =3D (const VMStateField[]) { + VMSTATE_VBUFFER_UINT64(addr, struct vhost_inflight, 0, NULL, size), + VMSTATE_END_OF_LIST() + } +}; + +const VMStateDescription vmstate_vhost_inflight_region =3D { + .name =3D "vhost-inflight-region", + .fields =3D (const VMStateField[]) { + VMSTATE_UINT64(size, struct vhost_inflight), + VMSTATE_UINT16(queue_size, struct vhost_inflight), + VMSTATE_END_OF_LIST() + }, + .subsections =3D (const VMStateDescription * const []) { + &vmstate_vhost_inflight_region_buffer, + NULL + } +}; + const VMStateDescription vmstate_vhost_virtqueue =3D { .name =3D "vhost-virtqueue", .fields =3D (const VMStateField[]) { diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index 13ca2c319f..dd552de91f 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -596,6 +596,12 @@ extern const VMStateDescription vmstate_backend_transf= er_vhost_inflight; vmstate_backend_transfer_vhost_inflight, \ struct vhost_inflight) =20 +extern const VMStateDescription vmstate_vhost_inflight_region; +#define VMSTATE_VHOST_INFLIGHT_REGION(_field, _state) \ + VMSTATE_STRUCT_POINTER(_field, _state, \ + vmstate_vhost_inflight_region, \ + struct vhost_inflight) + extern const VMStateDescription vmstate_vhost_dev; #define VMSTATE_BACKEND_TRANSFER_VHOST(_field, _state) \ VMSTATE_STRUCT(_field, _state, 0, vmstate_vhost_dev, struct vhost_dev) --=20 2.34.1 From nobody Tue Feb 10 17:51:17 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=yandex-team.ru ARC-Seal: i=1; a=rsa-sha256; t=1768218424; cv=none; d=zohomail.com; s=zohoarc; b=eKpOVCkMyJ6LDsQNys2otBlzAx1vgiSFqA+qZFfIf0XqZbw3OyxQ7f8sWXHF4UlXEQ4KRV+Yfkn6SUMWnMnFLl9tU+gMfxhPzt73DsJwWJ3U/m9dh2ldpUbhlTHc0XLaw+sghLHyTrh4+wGmew9XOcL74t575B30UZ8pijqxkkE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1768218424; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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dkim=pass header.i=@yandex-team.ru From: Alexandr Moshkov To: qemu-devel@nongnu.org Cc: "Gonglei (Arei)" , Zhenwei Pi , "Michael S. Tsirkin" , Stefano Garzarella , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Jason Wang , Paolo Bonzini , Fam Zheng , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Stefan Hajnoczi , mzamazal@redhat.com, Peter Xu , Fabiano Rosas , qemu-block@nongnu.org, virtio-fs@lists.linux.dev, "yc-core@yandex-team.ru" , Eric Blake , Markus Armbruster , Alexandr Moshkov Subject: [PATCH v5 5/5] vhost-user-blk: support inter-host inflight migration Date: Mon, 12 Jan 2026 16:45:03 +0500 Message-Id: <20260112114503.1174330-6-dtalexundeer@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> References: <20260112114503.1174330-1-dtalexundeer@yandex-team.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a02:6b8:c02:900:1:45:d181:df01; envelope-from=dtalexundeer@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1768218426595158500 Content-Type: text/plain; charset="utf-8" During inter-host migration, waiting for disk requests to be drained in the vhost-user backend can incur significant downtime. This can be avoided if QEMU migrates the inflight region in vhost-user-blk. Thus, during the qemu migration, with feature flag the vhost-user back-end can immediately stop vrings, so all in-flight requests will be migrated to another host. Signed-off-by: Alexandr Moshkov --- hw/block/vhost-user-blk.c | 28 ++++++++++++++++++++++++++++ include/hw/virtio/vhost-user-blk.h | 1 + 2 files changed, 29 insertions(+) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index a8fd90480a..5e44f6253c 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -656,6 +656,28 @@ static struct vhost_dev *vhost_user_blk_get_vhost(Virt= IODevice *vdev) return &s->dev; } =20 +static bool vhost_user_blk_inflight_needed(void *opaque) +{ + struct VHostUserBlk *s =3D opaque; + + bool inflight_drain =3D vhost_dev_has_feature(&s->dev, + VHOST_USER_PROTOCOL_F_GET_VRING_BASE_INFLIGHT); + + return s->inflight_migration && + inflight_drain && + !migrate_local_vhost_user_blk(); +} + +static const VMStateDescription vmstate_vhost_user_blk_inflight =3D { + .name =3D "vhost-user-blk/inflight", + .version_id =3D 1, + .needed =3D vhost_user_blk_inflight_needed, + .fields =3D (const VMStateField[]) { + VMSTATE_VHOST_INFLIGHT_REGION(inflight, VHostUserBlk), + VMSTATE_END_OF_LIST() + }, +}; + static bool vhost_user_blk_pre_incoming(void *opaque, Error **errp) { VHostUserBlk *s =3D VHOST_USER_BLK(opaque); @@ -678,6 +700,10 @@ static const VMStateDescription vmstate_vhost_user_blk= =3D { VMSTATE_VIRTIO_DEVICE, VMSTATE_END_OF_LIST() }, + .subsections =3D (const VMStateDescription * const []) { + &vmstate_vhost_user_blk_inflight, + NULL + } }; =20 static bool vhost_user_needed(void *opaque) @@ -751,6 +777,8 @@ static const Property vhost_user_blk_properties[] =3D { VIRTIO_BLK_F_WRITE_ZEROES, true), DEFINE_PROP_BOOL("skip-get-vring-base-on-force-shutdown", VHostUserBlk, skip_get_vring_base_on_force_shutdown, false), + DEFINE_PROP_BOOL("inflight-migration", VHostUserBlk, + inflight_migration, false), }; =20 static void vhost_user_blk_class_init(ObjectClass *klass, const void *data) diff --git a/include/hw/virtio/vhost-user-blk.h b/include/hw/virtio/vhost-u= ser-blk.h index b06f55fd6f..e1466e5cf6 100644 --- a/include/hw/virtio/vhost-user-blk.h +++ b/include/hw/virtio/vhost-user-blk.h @@ -52,6 +52,7 @@ struct VHostUserBlk { bool started_vu; =20 bool skip_get_vring_base_on_force_shutdown; + bool inflight_migration; =20 bool incoming_backend; }; --=20 2.34.1