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Mon, 17 Nov 2025 23:44:22 -0800 From: To: , , , , , , , , CC: , , , , , , , , , , , , , , , , Subject: [PATCH v2 0/6] vfio/nvgrace-gpu: Support huge PFNMAP and wait for GPU ready post reset Date: Tue, 18 Nov 2025 07:44:16 +0000 Message-ID: <20251118074422.58081-1-ankita@nvidia.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000AD7B:EE_|DM6PR12MB4314:EE_ X-MS-Office365-Filtering-Correlation-Id: 6223a8d7-d150-4b45-4bff-08de2676529a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700013|1800799024|82310400026|13003099007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?yVpRjWz58SslEVm19vMnReUas1A4Mj8Ib148IvmuXQ5hP2wbPdCVFyZWKvXY?= =?us-ascii?Q?GofNeu2jJev73pagxRZMKCZXw8I2frG2++WJZVjS3f47KnDLsCZMwya+1Hk0?= =?us-ascii?Q?GYaOnxHIKOXCxqpK687tAax9r+U1SQ0q+IjPj45YRPPjC5I7qLhNIeohTMvq?= =?us-ascii?Q?uaNu7CbtqJIoBs4Xe3svF1zvQvXXb4e9L0O0DtY4VRZvUK7WSpdv2GaAOm17?= =?us-ascii?Q?AI6ulrKB5rqbtIxFzEyZQ776qupybqcZrrwVd/ln0TJTMXDq2n3LaLnpZd6+?= =?us-ascii?Q?vDvEaVGnaKRs10ouS7LfnLtgg2uBuRKnbFSLEggpjU2mz3f0zn5Rk6HSPbIS?= =?us-ascii?Q?8Ab1qOg5SO9viGO/vw+MY3NjKoBPh2CaUBYOSLYQ6YPvUsklwzTCY0ufaiCm?= =?us-ascii?Q?8B3yPoPu/S9+Pxm3We6G5vI7C4qcJ6e2qJW8X6pzN8mkhTGcUX9xKLt3J1/3?= =?us-ascii?Q?nYbQmcS/zMoNVuM6hHlng7ZieDCnOCjzQrkmL3oKfnCPWTbhawzDMz3jH0Qa?= =?us-ascii?Q?yD9MlzeBvrXd0AYm3B/er20C2rW7RU/AcAH1OWUoz4IjPw9+UFWSeQQUCeyI?= =?us-ascii?Q?VpANMK4Buvv43UBufna1vQSprmobfMP3QzDpvBUM5GtJMGQjnDg//H5LbGTQ?= =?us-ascii?Q?6VrTS6WUs9EImNb9xs0NfA8TQ9cU1fG1Fi8Y8RQqmy8BGbHE6LgTs0oqta0L?= =?us-ascii?Q?oNxB1+mDTE01YqNlI9AbqHlBZo6lA4LJdtiG7JrzkPrb3+tFrBTh2vwsn8s2?= =?us-ascii?Q?9RPqO/nqZhC9tLTHOam83AjkQaLdF3ldy4sSjUd8ny9dsTSCg5QPOMoI7xqc?= =?us-ascii?Q?8BkyTVDnb2sRhd84/LKnIp1GBRKz5J9bJQgHYaTxCdfVIksTUVzI8WF59tyu?= =?us-ascii?Q?Xgu7xmQ/d22uUyZuYmCd0UZREGtUF7UCbmAVr85VPPMgzajDRKudSLbnsmAu?= =?us-ascii?Q?LvaTM3q5ZKov3CYf5vxIhsjgfhxEsuZk62AW5OgyfbFB0FHISRZ0YY8Wbbw8?= =?us-ascii?Q?b8RQTzX5i6FzLmNFS1iYLvQ2cyez2RkHROabWMXa6oFZngosrHLiRHGf2ibT?= =?us-ascii?Q?sOixsqOMWbGYX1IqCh0lcblkxNWire2ZlOSpkkVRnoDsGFqBtGTQgc7lxqA7?= =?us-ascii?Q?Z1/BgfT3+e0E2+ePWJzW2Qw8KLJEGl0q0piCF6ytQEzFtMHIRAzGjmiJJA2Y?= =?us-ascii?Q?UVQ9hfmiYfX3mQDrHJOBOMkgGGc52CqyoykNEy+wsTz98N5YlPHdGGYzfD4e?= =?us-ascii?Q?E8yiL+p/JniqqyqNEX2rLCOZb4/oeZ7hnz5RW+Chyvs7WmPE6QXv15dEc2nP?= =?us-ascii?Q?PoXL/z1Gqa1rLqOyXYgZuDVZ91NXPQhH6bc1JBcslreyjGu8cLlzlnuYA0pu?= =?us-ascii?Q?WHlk4EJn8xpDwce5res5UnRQP+6f1mCkRVSGekaRc1Uw5G1ZA2GTriMFgeP/?= =?us-ascii?Q?m5QdeB16SL8UjQ8OGktppqBIG+BjbqlCSNL7OStJBF1MrXddpHz1qK50o9Oc?= =?us-ascii?Q?qlphZhwWYH9KjpA2T7p5MhsWsdCbPbaiPSq7X2bU9ycFy4QhVa9Rkd2cNtKb?= =?us-ascii?Q?o2k5XxVPobJwwN5aRbaNJcKP8U7hY/B4akS1BRaI?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(7416014)(376014)(36860700013)(1800799024)(82310400026)(13003099007);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Nov 2025 07:44:36.5521 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6223a8d7-d150-4b45-4bff-08de2676529a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD7B.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4314 From: Ankit Agrawal NVIDIA's Grace based system have large GPU device memory. The device memory is mapped as VM_PFNMAP in the VMM VMA. The nvgrace-gpu module could make use of the huge PFNMAP support added in mm [1]. To achieve this, nvgrace-gpu module is updated to implement huge_fault ops. The implementation establishes mapping according to the order request. Note that if the PFN or the VMA address is unaligned to the order, the mapping fallbacks to the PTE level. Secondly, it is expected that the mapping not be re-established until the GPU is ready post reset. Presence of the mappings during that time could potentially leads to harmless corrected RAS events to be logged if the CPU attempts to do speculative reads on the GPU memory. Wait for the GPU to be ready on the first fault. The GPU readiness can be checked through BAR0 registers as is already being done at the device probe. Patch 1 updates the mapping mechanism to be done through faults. Patch 2 splits the code to map at the various levels. Patch 3 implements support for huge pfnmap. Path 4-6 intercepts reset request and ensures that the GP is ready before re-establishing the mapping after reset. Applied over 6.18-rc6. Link: https://lore.kernel.org/all/20240826204353.2228736-1-peterx@redhat.com/ [1] Changelog: v2: - Fixed build kernel warning - subject text changes - Rebased to 6.18-rc6. Link: https://lore.kernel.org/all/20251117124159.3560-1-ankita@nvidia.com/ [v1] Signed-off-by: Ankit Agrawal Ankit Agrawal (6): vfio/nvgrace-gpu: Use faults to map device memory vfio: export function to map the VMA vfio/nvgrace-gpu: Add support for huge pfnmap vfio: export vfio_find_cap_start vfio/nvgrace-gpu: split the code to wait for GPU ready vfio/nvgrace-gpu: wait for the GPU mem to be ready drivers/vfio/pci/nvgrace-gpu/main.c | 171 ++++++++++++++++++++++------ drivers/vfio/pci/vfio_pci_config.c | 3 +- drivers/vfio/pci/vfio_pci_core.c | 46 +++++--- include/linux/vfio_pci_core.h | 3 + 4 files changed, 169 insertions(+), 54 deletions(-) -- 2.34.1