vfio: selftests: Add memcpy chunking to vfio_pci_driver_memcpy()

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Add a chunking loop to vfio_pci_driver_memcpy() so that it breaks up
large memcpy requests into max_memcpy_size-sized chunks. This allows
callers to request any size without worrying about per-driver limits.
The memcpy_start()/memcpy_wait() semantics are unchanged.

Update the test to use 4x max_memcpy_size so it exercises the new
chunking path (4 iterations) while keeping execution fast for drivers
with small DMA transfer sizes.

Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Alex Williamson <alex.williamson@nvidia.com>
Signed-off-by: Rubin Du <rubind@nvidia.com>
Link: https://lore.kernel.org/r/20260609232855.3808971-2-rubind@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>

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Rubin Du 2026-06-09 16:28:52 -07:00 • committed by Alex Williamson

parent a13c140cc2

commit df34ecc525

2 changed files with 26 additions and 10 deletions

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18

tools/testing/selftests/vfio/lib/vfio_pci_driver.c

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18

tools/testing/selftests/vfio/vfio_pci_driver_test.c

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