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Till now VFIO has rejected pinned importers, largely to avoid being used with the RDMA pinned importer that cannot handle a move_notify() to revoke access. Using dma_buf_attach_revocable() it can tell the difference between pinned importers that support the flow described in dma_buf_invalidate_mappings() and those that don't. Thus permit compatible pinned importers. This is one of two items IOMMUFD requires to remove its private interface to VFIO's dma-buf. Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Alex Williamson <alex@shazbot.org> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Christian König <christian.koenig@amd.com> Link: https://lore.kernel.org/r/20260131-dmabuf-revoke-v7-7-463d956bd527@nvidia.com