linux/tools/testing/selftests/vfio, branch master

vfio: selftests: Support DMR and GNR-D DSA devices

2026-03-20T19:54:51Z

Currently, the VFIO DSA driver test only supports the SPR DSA device ID. Attempting to run the test on newer platforms like DMR or GNR-D results in a "No driver found" error, causing the test to be skipped. Refactor dsa_probe() to use a switch statement for checking device IDs. This improves maintainability and makes it easier to add new device IDs in the future. Add the following DSA device IDs to the supported list: PCI_DEVICE_ID_INTEL_DSA_DMR (0x1212) PCI_DEVICE_ID_INTEL_DSA_GNRD (0x11fb) Signed-off-by: Yi Lai Reviewed-by: David Matlack Link: https://lore.kernel.org/r/20260320010930.481380-1-yi1.lai@intel.com Signed-off-by: Alex Williamson

vfio: selftests: Build tests on aarch64

2026-03-20T19:52:16Z

Fix vfio selftests on aarch64, allowing native builds on aarch64 hosts. Reported-by: Matt Evans Closes: https://lore.kernel.org/all/e51b4ff2-13c4-47d4-b781-3dcbd740d274@meta.com/ Fixes: a55d4bbbe644 ("vfio: selftests: only build tests on arm64 and x86_64") Signed-off-by: Ted Logan Reviewed-by: David Matlack Link: https://lore.kernel.org/r/20260319-vfio-selftests-aarch64-v2-1-bb2621c24dc4@fb.com Signed-off-by: Alex Williamson

vfio: selftests: Fix VLA initialisation in vfio_pci_irq_set()

2026-03-19T18:32:08Z

C does not permit an initialiser expression on a variable-length array (C99 Section 6.7.9 constraint: "The type of the entity to be initialized shall not be a variable length array type"). vfio_pci_irq_set() declared: u8 buf[sizeof(struct vfio_irq_set) + sizeof(int) * count] = {}; where `count` is a runtime function parameter, making `buf` a VLA. GCC rejects this with (tried with GCC-9.4.0): error: variable-sized object may not be initialized Fix by removing the `= {}` initialiser and inserting an explicit memset() immediately after the declaration. memset() on a VLA is perfectly legal and achieves the same zero-initialisation on all conforming C implementations. Fixes: 19faf6fd969c ("vfio: selftests: Add a helper library for VFIO selftests") Cc: stable@vger.kernel.org Reviewed-by: Dave Jiang Reviewed-by: David Matlack Signed-off-by: Manish Honap Link: https://lore.kernel.org/r/20260317051402.3725670-1-mhonap@nvidia.com Signed-off-by: Alex Williamson

vfio: selftests: fix crash in vfio_dma_mapping_mmio_test

2026-03-10T17:56:01Z

Remove the __iommu_unmap() call on a region that was never mapped. When __iommu_map() fails (expected for MMIO vaddrs in non-VFIO modes), the region is not added to the dma_regions list, leaving its list_head zero-initialized. If the unmap ioctl returns success, __iommu_unmap() calls list_del_init() on this zeroed node and crashes. This fixes the iommufd_compat_type1 and iommufd_compat_type1v2 test variants. Fixes: 080723f4d4c3 ("vfio: selftests: Add vfio_dma_mapping_mmio_test") Signed-off-by: Alex Mastro Reviewed-by: David Matlack Reviewed-by: Yuan Yao Link: https://lore.kernel.org/r/20260303-fix-mmio-test-v1-1-78b4a9e46a4e@fb.com Signed-off-by: Alex Williamson

vfio: selftests: only build tests on arm64 and x86_64

2026-02-06T22:08:05Z

Only build vfio self-tests on arm64 and x86_64; these are the only architectures where the vfio self-tests are run. Addresses compiler warnings for format and conversions on i386. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202601211830.aBEjmEFD-lkp@intel.com/ Signed-off-by: Ted Logan Reviewed-by: David Matlack Link: https://lore.kernel.org/r/20260202-vfio-selftest-only-64bit-v2-1-9c3ebb37f0f4@fb.com Signed-off-by: Alex Williamson

vfio: selftests: Drop IOMMU mapping size assertions for VFIO_TYPE1_IOMMU

2026-01-19T17:06:30Z

Drop the assertions about IOMMU mappings sizes for VFIO_TYPE1_IOMMU modes (both the VFIO mode and the iommufd compatibility mode). These assertions fail when CONFIG_IOMMUFD_VFIO_CONTAINER is enabled, since iommufd compatibility mode provides different huge page behavior than VFIO for VFIO_TYPE1_IOMMU. VFIO_TYPE1_IOMMU is an old enough interface that it's not worth changing the behavior of VFIO and iommufd to match nor care about the IOMMU mapping sizes. Cc: Jason Gunthorpe Link: https://lore.kernel.org/kvm/20260109143830.176dc279@shazbot.org/ Signed-off-by: David Matlack Link: https://lore.kernel.org/r/20260114211252.2581145-1-dmatlack@google.com Signed-off-by: Alex Williamson

vfio: selftests: Add vfio_dma_mapping_mmio_test

2026-01-19T17:06:30Z

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). Signed-off-by: Alex Mastro Reviewed-by: David Matlack Tested-by: David Matlack Link: https://lore.kernel.org/r/20260114-map-mmio-test-v3-3-44e036d95e64@fb.com Signed-off-by: Alex Williamson

vfio: selftests: Align BAR mmaps for efficient IOMMU mapping

2026-01-19T17:06:30Z

Update vfio_pci_bar_map() to align BAR mmaps for efficient huge page mappings. The manual mmap alignment can be removed once mmap(!MAP_FIXED) on vfio device fds improves to automatically return well-aligned addresses. Also add MADV_HUGEPAGE, which encourages the kernel to use huge pages (e.g. when /sys/kernel/mm/transparent_hugepage/enabled is set to "madvise"). Drop MAP_FILE from mmap(). It is an ignored compatibility flag. Signed-off-by: Alex Mastro Reviewed-by: David Matlack Tested-by: David Matlack Link: https://lore.kernel.org/r/20260114-map-mmio-test-v3-2-44e036d95e64@fb.com Signed-off-by: Alex Williamson

vfio: selftests: Centralize IOMMU mode name definitions

2026-01-19T17:06:29Z

Replace scattered string literals with MODE_* macros in iommu.h. This provides a single source of truth for IOMMU mode name strings. Signed-off-by: Alex Mastro Reviewed-by: David Matlack Tested-by: David Matlack Link: https://lore.kernel.org/r/20260114-map-mmio-test-v3-1-44e036d95e64@fb.com Signed-off-by: Alex Williamson

vfio: selftests: Drop includes

2025-12-23T21:17:13Z

Drop the includes now that (tools/include/linux/types.h) has a definition for __aligned_le64, which is needed by . Including is harmless but causes benign typedef redefinitions. This is not a problem for VFIO selftests but becomes an issue when the VFIO selftests library is built into KVM selftests, since they are built with -std=gnu99 which does not allow typedef redifitions. No functional change intended. Signed-off-by: David Matlack Link: https://lore.kernel.org/r/20251219233818.1965306-3-dmatlack@google.com Signed-off-by: Alex Williamson