Test IOMMU mapping the BAR mmaps created during vfio_pci_device_setup(). All IOMMU modes are tested: vfio_type1 variants are expected to succeed, while non-type1 modes are expected to fail. iommufd compat mode can be updated to expect success once kernel support lands. Native iommufd will not support mapping vaddrs backed by MMIO (it will support dma-buf based MMIO mapping instead).
Changes in v3: - Rename mmap_aligned() to mmap_reserve() - Reorder variable declarations for reverse-fir-tree style - Update patch 2 commit message to mention MADV_HUGEPAGE and MAP_FILE - Move BAR size check into map_partial_bar test only - Link to v2: https://lore.kernel.org/r/[email protected] Changes in v2: - Split into patch series - Factor out mmap_reserve() for vaddr alignment - Align BAR mmaps to improve hugepage IOMMU mapping efficiency - Centralize MODE_* string definitions - Add is_power_of_2() assertion for BAR size - Simplify align calculation to min(size, 1G) - Add map_bar_misaligned test case - Link to v1: https://lore.kernel.org/all/20260107-scratch-amastro-vfio-dma-mapping-mmio-test-v1-1-0cec5e9ec...@fb.com Signed-off-by: Alex Mastro <[email protected]> --- Alex Mastro (3): vfio: selftests: Centralize IOMMU mode name definitions vfio: selftests: Align BAR mmaps for efficient IOMMU mapping vfio: selftests: Add vfio_dma_mapping_mmio_test tools/testing/selftests/vfio/Makefile | 1 + tools/testing/selftests/vfio/lib/include/libvfio.h | 9 ++ .../selftests/vfio/lib/include/libvfio/iommu.h | 6 + tools/testing/selftests/vfio/lib/iommu.c | 12 +- tools/testing/selftests/vfio/lib/libvfio.c | 25 ++++ tools/testing/selftests/vfio/lib/vfio_pci_device.c | 24 +++- .../selftests/vfio/vfio_dma_mapping_mmio_test.c | 143 +++++++++++++++++++++ .../testing/selftests/vfio/vfio_dma_mapping_test.c | 2 +- 8 files changed, 214 insertions(+), 8 deletions(-) --- base-commit: d721f52e31553a848e0e9947ca15a49c5674aef3 change-id: 20260112-map-mmio-test-b4e4c2d917a9 Best regards, -- Alex Mastro <[email protected]>
