[Linaro-mm-sig] Re: [PATCH v5 7/8] vfio: Permit VFIO to work with pinned importers

From: Leon Romanovsky leon@kernel.org Sent: Sunday, January 25, 2026 3:14 AM

From: Leon Romanovsky leonro@nvidia.com

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.

Signed-off-by: Leon Romanovsky leonro@nvidia.com

Reviewed-by: Kevin Tian kevin.tian@intel.com