Commit 61ceaf23 authored by Leon Romanovsky's avatar Leon Romanovsky Committed by Alex Williamson
Browse files

vfio: Prevent from pinned DMABUF importers to attach to VFIO DMABUF 



Some pinned importers, such as non-ODP RDMA ones, cannot invalidate their
mappings and therefore must be prevented from attaching to this exporter.

Fixes: 5d74781e ("vfio/pci: Add dma-buf export support for MMIO regions")
Signed-off-by: default avatarLeon Romanovsky <leonro@nvidia.com>
Reviewed-by: default avatarPranjal Shrivastava <praan@google.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20260121-vfio-add-pin-v1-1-4e04916b17f1@nvidia.com


Signed-off-by: default avatarAlex Williamson <alex@shazbot.org>
parent 24d479d2

drivers/vfio/pci/vfio_pci_dmabuf.c

+12 −0
Original line number Diff line number Diff line
@@ -20,6 +20,16 @@ struct vfio_pci_dma_buf { 
	u8 revoked : 1;

};



static int vfio_pci_dma_buf_pin(struct dma_buf_attachment *attachment)

{

	return -EOPNOTSUPP;

}



static void vfio_pci_dma_buf_unpin(struct dma_buf_attachment *attachment)

{

	/* Do nothing */

}



static int vfio_pci_dma_buf_attach(struct dma_buf *dmabuf,

				   struct dma_buf_attachment *attachment)

{
@@ -76,6 +86,8 @@ static void vfio_pci_dma_buf_release(struct dma_buf *dmabuf) 
}



static const struct dma_buf_ops vfio_pci_dmabuf_ops = {

	.pin = vfio_pci_dma_buf_pin,

	.unpin = vfio_pci_dma_buf_unpin,

	.attach = vfio_pci_dma_buf_attach,

	.map_dma_buf = vfio_pci_dma_buf_map,

	.unmap_dma_buf = vfio_pci_dma_buf_unmap,