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Tsirkin" , Saeed Mahameed , , CC: Dragos Tatulea , Parav Pandit , Xuan Zhuo , Subject: [PATCH 03/16] vhost-vdpa: uAPI to get dedicated descriptor group id Date: Tue, 12 Sep 2023 16:01:13 +0300 Message-ID: <20230912130132.561193-4-dtatulea@nvidia.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230912130132.561193-1-dtatulea@nvidia.com> References: <20230912130132.561193-1-dtatulea@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9D9:EE_|IA0PR12MB8375:EE_ X-MS-Office365-Filtering-Correlation-Id: 50b5d8a3-2eac-433d-ec69-08dbb39078ad 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)(136003)(396003)(39860400002)(346002)(376002)(186009)(451199024)(1800799009)(82310400011)(46966006)(40470700004)(36840700001)(41300700001)(316002)(40480700001)(26005)(336012)(426003)(1076003)(70586007)(8936002)(110136005)(2906002)(70206006)(8676002)(4326008)(54906003)(5660300002)(478600001)(6666004)(40460700003)(36756003)(36860700001)(47076005)(2616005)(83380400001)(86362001)(82740400003)(356005)(7636003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Sep 2023 13:02:08.2977 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 50b5d8a3-2eac-433d-ec69-08dbb39078ad 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: CY4PEPF0000E9D9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8375 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