linux-kernel - [PATCH v1 0/2] Register device memory for poison handling

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Message-ID: <20260108153548.7386-1-ankita@nvidia.com>
Date: Thu, 8 Jan 2026 15:35:46 +0000
From: <ankita@...dia.com>
To: <ankita@...dia.com>, <vsethi@...dia.com>, <jgg@...dia.com>,
	<mochs@...dia.com>, <jgg@...pe.ca>, <skolothumtho@...dia.com>,
	<alex@...zbot.org>, <linmiaohe@...wei.com>, <nao.horiguchi@...il.com>
CC: <cjia@...dia.com>, <zhiw@...dia.com>, <kjaju@...dia.com>,
	<yishaih@...dia.com>, <kevin.tian@...el.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH v1 0/2] Register device memory for poison handling

From: Ankit Agrawal <ankita@...dia.com>

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@...dia.com) and Alex Williamson
(alex@...zbot.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