vhost: fix caching attributes of MMIO regions by setting them explicitly

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[ Upstream commit 5145b27730 ]

Explicitly set non-cached caching attributes for MMIO regions.
Default write-back mode can cause CPU to cache device memory,
causing invalid reads and unpredictable behavior.

Invalid read and write issues were observed on ARM64 when mapping the
notification area to userspace via mmap.

Signed-off-by: Kommula Shiva Shankar <kshankar@marvell.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20260102065703.656255-1-kshankar@marvell.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Kommula Shiva Shankar 2026-01-02 12:27:03 +05:30 • committed by Sasha Levin

parent c45363db0d

commit 2fcdc1ccc2

1 changed files with 1 additions and 0 deletions

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drivers/vhost/vdpa.c

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