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Add a new IOMMU mode for using iommufd directly. In this mode userspace opens /dev/iommu and binds it to a device FD acquired through /dev/vfio/devices/vfioX. Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20250822212518.4156428-29-dmatlack@google.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>