vfio: trivially use __aligned_u64 for ioctl structs

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u64 alignment behaves differently depending on the architecture and so
<uapi/linux/types.h> offers __aligned_u64 to achieve consistent behavior
in kernel<->userspace ABIs.

There are structs in <uapi/linux/vfio.h> that can trivially be updated
to __aligned_u64 because the struct sizes are multiples of 8 bytes.
There is no change in memory layout on any CPU architecture and
therefore this change is safe.

The commits that follow this one handle the trickier cases where
explanation about ABI breakage is necessary.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://lore.kernel.org/r/20230918205617.1478722-2-stefanha@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Stefan Hajnoczi 2023-09-18 16:56:15 -04:00 • committed by Alex Williamson

parent 8a97ab9b8b

commit 2f8d25fa8a

1 changed files with 9 additions and 9 deletions

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include/uapi/linux/vfio.h

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