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Add new IOMMU modes for using iommufd in compatibility mode with VFIO_TYPE1_IOMMU and VFIO_TYPE1v2_IOMMU. In these modes, VFIO selftests will open /dev/iommu and treats it as a container FD (as if it had opened /dev/vfio/vfio) and the kernel translates the container ioctls to iommufd calls transparently. Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20250822212518.4156428-28-dmatlack@google.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>