From nobody Wed Feb 11 05:12:03 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