vduse: fix compat handling for VDUSE_IOTLB_GET_FD/VDUSE_VQ_GET_INFO

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These two ioctls are incompatible on 32-bit x86 userspace, because
the data structures are shorter than they are on 64-bit.

Add a proper .compat_ioctl handler for x86 that reads the structures
with the smaller padding before calling the internal handlers. On
all other architectures, CONFIG_COMPAT_FOR_U64_ALIGNMENT is disabled
and no special handling is required.

Fixes: ad146355bf ("vduse: Support querying information of IOVA regions")
Fixes: c8a6153b6c ("vduse: Introduce VDUSE - vDPA Device in Userspace")
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260213154051.4172275-1-arnd@kernel.org>

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Arnd Bergmann 2026-02-13 16:40:46 +01:00 • committed by Michael S. Tsirkin

parent ec6177dfe9

commit 455a2a1af9

1 changed files with 122 additions and 1 deletions

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drivers/vdpa/vdpa_user/vduse_dev.c

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