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Tue, 19 Dec 2023 10:09:10 -0800 From: Dragos Tatulea To: "Michael S . Tsirkin" , Jason Wang , Eugenio Perez Martin , Si-Wei Liu , Saeed Mahameed , Leon Romanovsky , , Gal Pressman CC: Dragos Tatulea , , , Parav Pandit , Xuan Zhuo Subject: [PATCH vhost v4 02/15] vdpa: Add VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND flag Date: Tue, 19 Dec 2023 20:08:45 +0200 Message-ID: <20231219180858.120898-3-dtatulea@nvidia.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231219180858.120898-1-dtatulea@nvidia.com> References: <20231219180858.120898-1-dtatulea@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB72:EE_|DM6PR12MB4546:EE_ X-MS-Office365-Filtering-Correlation-Id: d4e7cc82-c982-4f55-7be0-08dc00bda317 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:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(376002)(396003)(136003)(346002)(39860400002)(230922051799003)(64100799003)(186009)(451199024)(1800799012)(82310400011)(40470700004)(36840700001)(46966006)(36860700001)(7636003)(356005)(40480700001)(47076005)(40460700003)(1076003)(336012)(426003)(83380400001)(2616005)(66574015)(26005)(36756003)(86362001)(82740400003)(6666004)(478600001)(6636002)(316002)(54906003)(110136005)(70586007)(70206006)(4744005)(4326008)(8676002)(8936002)(2906002)(5660300002)(41300700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Dec 2023 18:09:26.2936 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d4e7cc82-c982-4f55-7be0-08dc00bda317 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB72.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4546 The virtio spec doesn't allow changing virtqueue addresses after DRIVER_OK. Some devices do support this operation when the device is suspended. The VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND flag advertises this support as a backend features. Signed-off-by: Dragos Tatulea Suggested-by: Eugenio Pérez --- include/uapi/linux/vhost_types.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h index d7656908f730..aacd067afc89 100644 --- a/include/uapi/linux/vhost_types.h +++ b/include/uapi/linux/vhost_types.h @@ -192,5 +192,9 @@ struct vhost_vdpa_iova_range { #define VHOST_BACKEND_F_DESC_ASID 0x7 /* IOTLB don't flush memory mapping across device reset */ #define VHOST_BACKEND_F_IOTLB_PERSIST 0x8 +/* Device supports changing virtqueue addresses when device is suspended + * and is in state DRIVER_OK. + */ +#define VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND 0x9 #endif -- 2.43.0