Re: [PATCH 0/2] vfio: selftests: Fix MMIO test failures in iommufd compat mode

[David Matlack]

On Thu, Mar 19, 2026 at 9:03 PM Yi Lai <yi1.lai@xxxxxxxxx> wrote:
>
> This series fixes two issues in the vfio_dma_mapping_mmio_test selftest when
> running in iommufd compat mode.
>
> The first patch fixes a segmentation fault caused by an uninitialized list head
> when __iommu_map() fails (as expected for MMIO regions in iommufd).
>
> The second patch fixes a test assertion failure by aligning the check for the
> __iommu_unmap() return value based on the iommufd mode (native vs. compat).

Alex Mastro also sent a fix for these issues here:

  https://lore.kernel.org/kvm/20260303-fix-mmio-test-v1-1-78b4a9e46a4e@xxxxxx/

Can you take a look and see if it looks ok to you? I think I prefer
Alex's fix. We shouldn't even be calling __iommu_unmap() after
__iommu_map() fails.