linux-kernel - [PATCH v2 0/3] vfio: selftests: Add MMIO DMA mapping test

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Message-ID: <20260113-map-mmio-test-v2-0-e6d34f09c0bb@fb.com>
Date: Tue, 13 Jan 2026 15:08:35 -0800
From: Alex Mastro <amastro@...com>
To: Alex Williamson <alex@...zbot.org>, David Matlack <dmatlack@...gle.com>,
        Shuah Khan <shuah@...nel.org>
CC: Peter Xu <peterx@...hat.com>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        Jason Gunthorpe
	<jgg@...pe.ca>, Alex Mastro <amastro@...com>
Subject: [PATCH v2 0/3] vfio: selftests: Add MMIO DMA mapping test

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).

To: Alex Williamson <alex@...zbot.org>
To: David Matlack <dmatlack@...gle.com>
To: Shuah Khan <shuah@...nel.org>
Cc: Peter Xu <peterx@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org
Cc: Jason Gunthorpe <jgg@...pe.ca>

Changes in v2:
- Split into patch series
- Factor out mmap_aligned() 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/aWA4GKp5ld92sY6e@devgpu015.cco6.facebook.com

Signed-off-by: Alex Mastro <amastro@...com>
---
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    | 144 +++++++++++++++++++++
 .../testing/selftests/vfio/vfio_dma_mapping_test.c |   2 +-
 8 files changed, 215 insertions(+), 8 deletions(-)
---
base-commit: d721f52e31553a848e0e9947ca15a49c5674aef3
change-id: 20260112-map-mmio-test-b4e4c2d917a9

Best regards,
-- 
Alex Mastro <amastro@...com>