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Tsirkin" , Jason Wang , Eugenio Perez Martin , Si-Wei Liu , Saeed Mahameed , Leon Romanovsky , CC: Dragos Tatulea , , , Parav Pandit , Xuan Zhuo Subject: [PATCH vhost v3 04/16] vhost-vdpa: uAPI to get dedicated descriptor group id Date: Mon, 9 Oct 2023 14:23:49 +0300 Message-ID: <20231009112401.1060447-5-dtatulea@nvidia.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231009112401.1060447-1-dtatulea@nvidia.com> References: <20231009112401.1060447-1-dtatulea@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECDB:EE_|PH7PR12MB8013:EE_ X-MS-Office365-Filtering-Correlation-Id: 4e323531-6119-4d64-0a55-08dbc8ba59f6 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)(186009)(82310400011)(1800799009)(451199024)(64100799003)(36840700001)(40470700004)(46966006)(40480700001)(40460700003)(36860700001)(478600001)(47076005)(6666004)(110136005)(8936002)(5660300002)(8676002)(4326008)(41300700001)(70586007)(70206006)(2616005)(54906003)(83380400001)(336012)(426003)(26005)(1076003)(86362001)(316002)(2906002)(7636003)(36756003)(356005)(82740400003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Oct 2023 11:24:49.9794 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4e323531-6119-4d64-0a55-08dbc8ba59f6 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: MN1PEPF0000ECDB.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB8013 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Si-Wei Liu With _F_DESC_ASID backend feature, the device can now support the VHOST_VDPA_GET_VRING_DESC_GROUP ioctl, and it may expose the descriptor table (including avail and used ring) in a different group than the buffers it contains. This new uAPI will fetch the group ID of the descriptor table. Signed-off-by: Si-Wei Liu Acked-by: Eugenio Pérez Acked-by: Jason Wang --- drivers/vhost/vdpa.c | 10 ++++++++++ include/uapi/linux/vhost.h | 8 ++++++++ 2 files changed, 18 insertions(+) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 2f21798a37ee..851535f57b95 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -613,6 +613,16 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, else if (copy_to_user(argp, &s, sizeof(s))) return -EFAULT; return 0; + case VHOST_VDPA_GET_VRING_DESC_GROUP: + if (!vhost_vdpa_has_desc_group(v)) + return -EOPNOTSUPP; + s.index = idx; + s.num = ops->get_vq_desc_group(vdpa, idx); + if (s.num >= vdpa->ngroups) + return -EIO; + else if (copy_to_user(argp, &s, sizeof(s))) + return -EFAULT; + return 0; case VHOST_VDPA_SET_GROUP_ASID: if (copy_from_user(&s, argp, sizeof(s))) return -EFAULT; diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index f5c48b61ab62..649560c685f1 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -219,4 +219,12 @@ */ #define VHOST_VDPA_RESUME _IO(VHOST_VIRTIO, 0x7E) +/* Get the group for the descriptor table including driver & device areas + * of a virtqueue: read index, write group in num. + * The virtqueue index is stored in the index field of vhost_vring_state. + * The group ID of the descriptor table for this specific virtqueue + * is returned via num field of vhost_vring_state. + */ +#define VHOST_VDPA_GET_VRING_DESC_GROUP _IOWR(VHOST_VIRTIO, 0x7F, \ + struct vhost_vring_state) #endif