On Fri, May 23, 2025 at 11:29:53PM +0000, David Matlack wrote: > From: Josh Hilke <jrhi...@google.com> > > 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 <jrhi...@google.com> > [reword commit message, refactor code] > Signed-off-by: David Matlack <dmatl...@google.com> > --- > .../selftests/vfio/vfio_dma_mapping_test.c | 126 +++++++++++++++++- > 1 file changed, 119 insertions(+), 7 deletions(-)
FWIW, I'm thinking to add an iommufd ioctl to report back on the # of PTEs of each page size within a range. This would be after we get the new page table stuff merged. Jason
