linux-kernel - Re: [PATCH v3 0/3] vfio: selftests: Add MMIO DMA mapping test

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Message-ID: <20260119133828.62b1150a@shazbot.org>
Date: Mon, 19 Jan 2026 13:38:28 -0700
From: Alex Williamson <alex@...zbot.org>
To: Alex Mastro <amastro@...com>
Cc: David Matlack <dmatlack@...gle.com>, Shuah Khan <shuah@...nel.org>,
 Peter Xu <peterx@...hat.com>, <linux-kernel@...r.kernel.org>,
 <kvm@...r.kernel.org>, <linux-kselftest@...r.kernel.org>, Jason Gunthorpe
 <jgg@...pe.ca>
Subject: Re: [PATCH v3 0/3] vfio: selftests: Add MMIO DMA mapping test

On Wed, 14 Jan 2026 10:57:15 -0800
Alex Mastro <amastro@...com> wrote:

> 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/20260113-map-mmio-test-v2-0-e6d34f09c0bb@fb.com
> 
> 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-v1-1-0cec5e9ec89b@fb.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    | 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,

Applied to vfio next branch for v6.20/7.0.  Thanks,

Alex