From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 15B4DCCA47C for ; Tue, 12 Jul 2022 11:03:11 +0000 (UTC) Received: from localhost ([::1]:53044 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oBDfa-0002Ry-4H for qemu-devel@archiver.kernel.org; Tue, 12 Jul 2022 07:03:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54264) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oBDd5-0000UC-LL for qemu-devel@nongnu.org; Tue, 12 Jul 2022 07:00:35 -0400 Received: from mail-dm6nam11on20611.outbound.protection.outlook.com ([2a01:111:f400:7eaa::611]:7008 helo=NAM11-DM6-obe.outbound.protection.outlook.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oBDcz-0005cy-FF for qemu-devel@nongnu.org; Tue, 12 Jul 2022 07:00:34 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=e6P0Bybyx9pFpPTA3l6cOX9jPUPz3SMJOQDNJDBA3PUelrNaOFI6agwuUMq+nTKOsmIgBhaE3bHlhWHvMyIza+MZwAYnjtjdTp71ix+EFrAsQ/0IdmFCjKt5cLCcukK+x4F4ORGf/VmXnDNabNCn5mxq+oW3mnlPan+W8vd5NpWVcektD7uVha8NcJuSHlsat7X2+N3ZRRULv7vSSN4aiFbxHkfQnx9esP4BIchzlb9Jv9ilK0iCvda3qVnmRzYnNaxa/zwr4sQBTd7mYPhi10PI4Q6RePoN5OwrBOC84SG0i8fHzK4sSYVLgBidp3512okRrC1fkRCxlRoGLUTOIA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=RDSLChVyNcO39z/ItAalx73ae68buT8/Wzuy+waJFHE=; b=B83E6/vakncveQbTm1ca39rAlnWUU2MFowrDdT8KcFgtxfHQSLip3vlwhhHekgNzpSzOUEDlLxGUWpR/3b97giixbtLg/z9yp8xg8iYATabZH+y2YsfY7e6ZR6seVq7wJdNJEJ8UgdZlXUjsX45kC1AIKtxzhTFZmfQKAO1uFXLvWhTzTQ94r9vxpmgW+BbRNkkcAErZytMqtlMnKvWxDwI/rZPJ7fbpnS2KpD/zCV9PjAq5Cj8IPOIQlu4Uk5OyrzxrTEOmztDNItnISQ144u2sDASsxKz0qJ5BZljMJgnd/vq+4Gx2xNR2+xLkPw+aM6Or8BYwVgoCfKi5OpRM4w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 12.22.5.236) smtp.rcpttodomain=redhat.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=RDSLChVyNcO39z/ItAalx73ae68buT8/Wzuy+waJFHE=; b=GPsH9YBp7NG5r9hSNBTjthLC1x29zDyKDNAmfO0CVxb6iJ6QEuku5hcm7iIt+iQTg6wCUD0ymdQiwRyng4pY3hcufn1kyXKDZZWTMRVXPcMZPylwM78/ElDAwXGL0LmC6GQezuSdTFVMk13g5QFpmVypX+JecWjlyt+JImym+2Ll1leZHCxrrhApEgDKXO9LwWZdIIne5YEVhDJrr//waqxDO7VasKElokHmi2jWW0inpXJpFkVmHqNtPNSqqG5o9Ofh9eq1bbl0VEPJYj+yxRrYcOF1ASwgQLNXXbJXst216d/pmTVOHSMuU2cABeJO+Iks5mZ3ZXmQ/YFA8eX1ig== Received: from MW4PR04CA0329.namprd04.prod.outlook.com (2603:10b6:303:82::34) by MN2PR12MB3629.namprd12.prod.outlook.com (2603:10b6:208:cb::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5417.15; Tue, 12 Jul 2022 10:55:22 +0000 Received: from CO1NAM11FT061.eop-nam11.prod.protection.outlook.com (2603:10b6:303:82:cafe::a0) by MW4PR04CA0329.outlook.office365.com (2603:10b6:303:82::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5417.26 via Frontend Transport; Tue, 12 Jul 2022 10:55:22 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 12.22.5.236) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 12.22.5.236 as permitted sender) receiver=protection.outlook.com; client-ip=12.22.5.236; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (12.22.5.236) by CO1NAM11FT061.mail.protection.outlook.com (10.13.175.200) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.5417.15 via Frontend Transport; Tue, 12 Jul 2022 10:55:22 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by DRHQMAIL109.nvidia.com (10.27.9.19) with Microsoft SMTP Server (TLS) id 15.0.1497.32; Tue, 12 Jul 2022 10:55:21 +0000 Received: from nvidia.com (10.126.230.35) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.26; Tue, 12 Jul 2022 03:55:20 -0700 From: Yajun Wu To: , , , Subject: [PATCH v2 0/2] vhost-user: Support vhost_dev_start Date: Tue, 12 Jul 2022 13:54:59 +0300 Message-ID: <20220712105501.688628-1-yajunw@nvidia.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220629022517.2600911-1-yajunw@nvidia.com> References: <20220629022517.2600911-1-yajunw@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.126.230.35] X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 389e8c47-0bff-42b8-22aa-08da63f504d7 X-MS-TrafficTypeDiagnostic: MN2PR12MB3629:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.236; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:InfoNoRecords; CAT:NONE; SFS:(13230016)(4636009)(136003)(376002)(346002)(39860400002)(396003)(40470700004)(46966006)(36840700001)(7696005)(6666004)(2906002)(86362001)(6286002)(83380400001)(6636002)(8676002)(110136005)(316002)(36756003)(41300700001)(1076003)(70206006)(82310400005)(70586007)(186003)(36860700001)(5660300002)(356005)(8936002)(478600001)(82740400003)(426003)(2616005)(40460700003)(26005)(81166007)(336012)(47076005)(16526019)(966005)(55016003)(40480700001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jul 2022 10:55:22.4598 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 389e8c47-0bff-42b8-22aa-08da63f504d7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[12.22.5.236]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT061.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3629 Received-SPF: softfail client-ip=2a01:111:f400:7eaa::611; envelope-from=yajunw@nvidia.com; helo=NAM11-DM6-obe.outbound.protection.outlook.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The motivation of adding vhost-user vhost_dev_start support is to improve backend configuration speed and reduce live migration VM downtime. Today VQ configuration is issued one by one. For virtio net with multi-queue support, backend needs to update RSS (Receive side scaling) on every rx queue enable. Updating RSS is time-consuming (typical time like 7ms). Implement already defined vhost status and message in the vhost specification [1]. (a) VHOST_USER_PROTOCOL_F_STATUS (b) VHOST_USER_SET_STATUS (c) VHOST_USER_GET_STATUS Send message VHOST_USER_SET_STATUS with VIRTIO_CONFIG_S_DRIVER_OK for device start and reset(0) for device stop. On reception of the DRIVER_OK message, backend can apply the needed setting only once (instead of incremental) and also utilize parallelism on enabling queues. This improves QEMU's live migration downtime with vhost user backend implementation by great margin, specially for the large number of VQs of 64 from 800 msec to 250 msec. Another change is to move the device start routines after finishing all the necessary device and VQ configuration, further aligning to the virtio specification for "device initialization sequence". [1] https://qemu-project.gitlab.io/qemu/interop/vhost-user.html#introduction v2: - add setting status bit VIRTIO_CONFIG_S_FEATURES_OK - avoid adding status bits already set Yajun Wu (2): vhost: Change the sequence of device start vhost-user: Support vhost_dev_start hw/block/vhost-user-blk.c | 18 ++++++---- hw/net/vhost_net.c | 12 +++---- hw/virtio/vhost-user.c | 74 ++++++++++++++++++++++++++++++++++++++- 3 files changed, 90 insertions(+), 14 deletions(-) -- 2.27.0