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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2025 14:19:41.4433 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 104b4566-318d-453c-9d90-08de149ab444 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: SJ1PEPF00002326.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV9PR12MB9760 X-Rspamd-Server: rspam01 X-Stat-Signature: xgf69e8emq3qnpkz4ig638fjkto1kpjm X-Rspam-User: X-Rspamd-Queue-Id: E9A44A0006 X-HE-Tag: 1761488386-195016 X-HE-Meta: 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 9BNzOAo8 d5FOpD+0qToBEigAQ4ieSZ6bPdMe9sonxvJH5gykjOcJrYP9qAf1uUjUHVIwYhjd2M16iuHjLfe6QsAThw3NOJiP4GaDQfiqtPmqkmZeDwQ4EL0+hAXxmdvStlKVjGUMVobvT18HV/P9/bCvD5nxmIfKonIVHa8HRi99chKXfF8KJyRWWao/QU3ySxFRPsdz1F/qljhoCmP98qt/lBRvqonyr5lODJDq/vZyqYauChLG77HpuOsq5xw5b+dsxt3RyK+JDtjQwTLJNPJ9qXaeKEIluYLPhDF7AMAkqiP5h2r1y9Lh81YRG+7wG9W+1WnmLHXmsQf7t72V0NrXp7FaZovIedeSWkcuD4BNZRsvZTsAydl217jIqLjM6Rj08d4avkbgpBCVx7tiZeVYmDcktnw3+axaaxaTG8BiXPoUWztNRTGs= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ankit Agrawal The nvgrace-gpu-vfio-pci module [1] maps the device memory to the user VA (Qemu) using remap_pfn_range() without adding the memory to the kernel. The device memory pages are not backed by struct page. The previous patch implements the mechanism to handle ECC/poison on memory page without struct page. This new mechanism is being used here. The module registers its memory region and the address_space with the kernel MM for ECC handling using the register_pfn_address_space() registration API exposed by the kernel. Link: https://lore.kernel.org/all/20240220115055.23546-1-ankita@nvidia.com/ [1] Signed-off-by: Ankit Agrawal --- drivers/vfio/pci/nvgrace-gpu/main.c | 45 ++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/pci/nvgrace-gpu/main.c b/drivers/vfio/pci/nvgrace-gpu/main.c index d95761dcdd58..80b3ed63c682 100644 --- a/drivers/vfio/pci/nvgrace-gpu/main.c +++ b/drivers/vfio/pci/nvgrace-gpu/main.c @@ -8,6 +8,10 @@ #include #include +#ifdef CONFIG_MEMORY_FAILURE +#include +#endif + /* * The device memory usable to the workloads running in the VM is cached * and showcased as a 64b device BAR (comprising of BAR4 and BAR5 region) @@ -47,6 +51,9 @@ struct mem_region { void *memaddr; void __iomem *ioaddr; }; /* Base virtual address of the region */ +#ifdef CONFIG_MEMORY_FAILURE + struct pfn_address_space pfn_address_space; +#endif }; struct nvgrace_gpu_pci_core_device { @@ -60,6 +67,28 @@ struct nvgrace_gpu_pci_core_device { bool has_mig_hw_bug; }; +#ifdef CONFIG_MEMORY_FAILURE + +static int +nvgrace_gpu_vfio_pci_register_pfn_range(struct mem_region *region, + struct vm_area_struct *vma) +{ + unsigned long nr_pages; + int ret = 0; + + nr_pages = region->memlength >> PAGE_SHIFT; + + region->pfn_address_space.node.start = vma->vm_pgoff; + region->pfn_address_space.node.last = vma->vm_pgoff + nr_pages - 1; + region->pfn_address_space.mapping = vma->vm_file->f_mapping; + + ret = register_pfn_address_space(®ion->pfn_address_space); + + return ret; +} + +#endif + static void nvgrace_gpu_init_fake_bar_emu_regs(struct vfio_device *core_vdev) { struct nvgrace_gpu_pci_core_device *nvdev = @@ -127,6 +156,13 @@ static void nvgrace_gpu_close_device(struct vfio_device *core_vdev) mutex_destroy(&nvdev->remap_lock); +#ifdef CONFIG_MEMORY_FAILURE + if (nvdev->resmem.memlength) + unregister_pfn_address_space(&nvdev->resmem.pfn_address_space); + + unregister_pfn_address_space(&nvdev->usemem.pfn_address_space); +#endif + vfio_pci_core_close_device(core_vdev); } @@ -202,7 +238,14 @@ static int nvgrace_gpu_mmap(struct vfio_device *core_vdev, vma->vm_pgoff = start_pfn; - return 0; +#ifdef CONFIG_MEMORY_FAILURE + if (nvdev->resmem.memlength && index == VFIO_PCI_BAR2_REGION_INDEX) + ret = nvgrace_gpu_vfio_pci_register_pfn_range(&nvdev->resmem, vma); + else if (index == VFIO_PCI_BAR4_REGION_INDEX) + ret = nvgrace_gpu_vfio_pci_register_pfn_range(&nvdev->usemem, vma); +#endif + + return ret; } static long -- 2.34.1