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The device memory on NVIDIA Grace based systems are not added to the kernel and are not backed by struct pages. So nvgrace-gpu module which manages the device memory can make use of these interfaces to get the benefit of poison handling. Make nvgrace-gpu register the device memory with the MM on open. Moreover, the stubs are added to accommodate for CONFIG_MEMORY_FAILURE being disabled. Patch 1/2 introduces stubs for CONFIG_MEMORY_FAILURE disabled. Patch 2/2 registers the device memory at the time of open instead of mmap. Note that this is a reposting of an earlier series [1] which is partly (patch 1/3) merged to v6.19-rc4. This one addresses the leftover patching. Many thanks to Jason Gunthorpe (jgg@nvidia.com) and Alex Williamson (alex@shazbot.org) for valuable suggestions. Link: https://lore.kernel.org/all/20251213044708.3610-1-ankita@nvidia.com/ [1] Changelog: v2: - Fixed nit to cleanup nvgrace_gpu_vfio_pci_register_pfn_range (Thanks Jiaqi Yan) Link: https://lore.kernel.org/all/20260108153548.7386-1-ankita@nvidia.com/ [v1] Ankit Agrawal (2): mm: add stubs for PFNMAP memory failure registration functions vfio/nvgrace-gpu: register device memory for poison handling drivers/vfio/pci/nvgrace-gpu/main.c | 113 +++++++++++++++++++++++++++- include/linux/memory-failure.h | 13 +++- 2 files changed, 120 insertions(+), 6 deletions(-) -- 2.34.1