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Fri, 18 Sep 2026 07:56:16 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SN1PEPF00036F40.mail.protection.outlook.com (10.167.248.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.451.8 via Frontend Transport; Fri, 18 Sep 2026 07:56:16 +0000 Received: from honglei-remote.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49; Fri, 18 Sep 2026 02:56:13 -0500 From: Honglei Huang To: CC: Honglei Huang Subject: [PATCH v8 2/4] drm/virtgpu api: add blob userptr resource Date: Fri, 18 Sep 2026 15:55:58 +0800 Message-ID: <20260918075600.2197253-3-honghuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260918075600.2197253-1-honghuan@amd.com> References: <20260918075600.2197253-1-honghuan@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF00036F40:EE_|PH8PR12MB7229:EE_ X-MS-Office365-Filtering-Correlation-Id: b96b902c-7d9a-4ba3-76b4-08df155a5114 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Ip=[165.204.84.17]; Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF00036F40.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7229 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add a userptr address field so userspace can request a blob backed by an existing process mapping. A non-zero userptr selects that path; probe VIRTGPU_PARAM_USERPTR before using the field. GPU-readonly backing is requested with the virtio CREATE_BLOB wire flag VIRTIO_GPU_BLOB_FLAG_USE_READONLY (also VIRTGPU_BLOB_FLAG_USE_READONLY). The device MUST NOT write such a resource. The guest pins without FOLL_WRITE only when the device advertised VIRTIO_GPU_F_BLOB_READONLY (VIRTGPU_PARAM_BLOB_READONLY). Signed-off-by: Honglei Huang --- include/uapi/drm/virtgpu_drm.h | 13 +++++++++++++ include/uapi/linux/virtio_gpu.h | 6 ++++++ 2 files changed, 19 insertions(+) diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h index 95587e12ae..80f73b3276 100644 --- a/include/uapi/drm/virtgpu_drm.h +++ b/include/uapi/drm/virtgpu_drm.h @@ -99,6 +99,8 @@ struct drm_virtgpu_execbuffer { #define VIRTGPU_PARAM_SUPPORTED_CAPSET_IDs 7 /* Bitmask of supported capability set ids */ #define VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME 8 /* Ability to set debug name from userspace */ #define VIRTGPU_PARAM_BLOB_ALIGNMENT 9 /* Device alignment requirements for blobs */ +#define VIRTGPU_PARAM_USERPTR 10 /* CREATE_BLOB userptr field is supported */ +#define VIRTGPU_PARAM_BLOB_READONLY 11 /* VIRTGPU_BLOB_FLAG_USE_READONLY is honored */ struct drm_virtgpu_getparam { __u64 param; @@ -186,6 +188,10 @@ struct drm_virtgpu_resource_create_blob { #define VIRTGPU_BLOB_FLAG_USE_MAPPABLE 0x0001 #define VIRTGPU_BLOB_FLAG_USE_SHAREABLE 0x0002 #define VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE 0x0004 +/* Wire flag: device MUST NOT write. Guest pins without FOLL_WRITE. + * Rejected unless VIRTGPU_PARAM_BLOB_READONLY is 1. + */ +#define VIRTGPU_BLOB_FLAG_USE_READONLY 0x0008 /* zero is invalid blob_mem */ __u32 blob_mem; __u32 blob_flags; @@ -205,6 +211,13 @@ struct drm_virtgpu_resource_create_blob { #define DRM_VIRTGPU_BLOB_FLAG_HINT_DEFER_MAPPING 0x0001 __u32 blob_hints; __u32 pad2; + + /* + * Guest VA to pin as blob backing. Non-zero selects the userptr + * path and is valid only with VIRTGPU_BLOB_MEM_GUEST. Must be 0 + * otherwise. Probe VIRTGPU_PARAM_USERPTR before using this field. + */ + __u64 userptr; }; #define VIRTGPU_CONTEXT_PARAM_CAPSET_ID 0x0001 diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h index 3d4dfadc9d..33f5332e59 100644 --- a/include/uapi/linux/virtio_gpu.h +++ b/include/uapi/linux/virtio_gpu.h @@ -72,6 +72,10 @@ * must be aligned to that value. */ #define VIRTIO_GPU_F_BLOB_ALIGNMENT 5 +/* + * VIRTIO_GPU_BLOB_FLAG_USE_READONLY + */ +#define VIRTIO_GPU_F_BLOB_READONLY 6 enum virtio_gpu_ctrl_type { VIRTIO_GPU_UNDEFINED = 0, @@ -415,6 +419,8 @@ struct virtio_gpu_resource_create_blob { #define VIRTIO_GPU_BLOB_FLAG_USE_MAPPABLE 0x0001 #define VIRTIO_GPU_BLOB_FLAG_USE_SHAREABLE 0x0002 #define VIRTIO_GPU_BLOB_FLAG_USE_CROSS_DEVICE 0x0004 +/* Device MUST NOT write. Driver may pin read-only guest pages. */ +#define VIRTIO_GPU_BLOB_FLAG_USE_READONLY 0x0008 /* zero is invalid blob mem */ __le32 blob_mem; __le32 blob_flags; -- 2.34.1