vfio: selftests: Validate 2M/1G HugeTLB are mapped as 2M/1G in IOMMU

Update vfio dma mapping test to verify that the IOMMU uses 2M and 1G
mappings when 2M and 1G HugeTLB pages are mapped into a device
respectively.

This validation is done by inspecting the contents of the I/O page
tables via /sys/kernel/debug/iommu/intel/. This validation is skipped if
that directory is not available (i.e. non-Intel IOMMUs).

Signed-off-by: Josh Hilke <jrhilke@google.com>
[reword commit message, refactor code]
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20250822212518.4156428-9-dmatlack@google.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

0 files changed, 0 insertions, 0 deletions