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Sat, 7 Dec 2024 04:51:08 -0600 From: Julia Zhang To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , , , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , CC: Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , Daniel Vetter , Chen Jiqian , Huang Rui , Penny Zheng , Zhu Lingshan , Anthony PERARD , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Jan Beulich , Paul Durrant , Julia Zhang Subject: [PATCH 0/3] virtgpu: check if P2P is possiable or not Date: Sat, 7 Dec 2024 18:50:20 +0800 Message-ID: <20241207105023.542399-1-julia.zhang@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF0000013D:EE_|BY5PR12MB4148:EE_ X-MS-Office365-Filtering-Correlation-Id: e51dea4b-ee44-41df-ebbf-08dd16ad11c8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|82310400026|7416014|376014|921020; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2024 10:51:13.9074 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e51dea4b-ee44-41df-ebbf-08dd16ad11c8 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF0000013D.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4148 To implement dGPU prime feature, virtgpu needs to import/export buffer between virtio iGPU and passthrough dGPU. Before that, virtgpu should check if P2P is possible or not. But calling function pci_p2pdma_distance in guest VM will only get virtual p2pdma_distance instead of real physical p2pdma_distance. So this series introduce an implementation of virtgpu device_attach callback to get p2pdma_distance. And also adds a new virtgpu command to pass PCI notations from guest to host and a new xen privcmd to get physical p2pdma_distance according to the PCI notations in host. Julia Zhang (3): xen:get p2pdma_distance virtgpu: get p2pdma_distance drm/virtio: Implement device_attach drivers/gpu/drm/virtio/virtgpu_drv.h | 17 ++++++++ drivers/gpu/drm/virtio/virtgpu_prime.c | 59 +++++++++++++++++++++++++- drivers/gpu/drm/virtio/virtgpu_vq.c | 53 +++++++++++++++++++++++ drivers/xen/privcmd.c | 42 ++++++++++++++++++ include/uapi/linux/virtio_gpu.h | 19 +++++++++ include/uapi/xen/privcmd.h | 12 ++++++ 6 files changed, 201 insertions(+), 1 deletion(-) -- 2.34.1