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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jan 2026 15:36:09.9110 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 490cb19a-a7e5-4ec3-4434-08de4ecba5c3 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: SJ1PEPF00001CE8.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8905 X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: AD8A7140008 X-Stat-Signature: apddur73pqc7e851fhjctwx557bxt4g7 X-HE-Tag: 1767886577-825280 X-HE-Meta: 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 r0elNuta FSoklZmATLKCIEwJC9vvH4hhfqbuUPiFgW6oH 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 Linux MM provides interfaces to allow a driver to [un]register device memory not backed by struct page for poison handling through memory_failure. 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] 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 | 116 +++++++++++++++++++++++++++- include/linux/memory-failure.h | 13 +++- 2 files changed, 123 insertions(+), 6 deletions(-) -- 2.34.1