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

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

Fixes: 5d74781ebc ("vfio/pci: Add dma-buf export support for MMIO regions")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20260121-vfio-add-pin-v1-1-4e04916b17f1@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
This commit is contained in:
Leon Romanovsky 2026-01-21 17:45:02 +02:00 • committed by Alex Williamson
parent 24d479d26b
commit 61ceaf2361
1 changed files with 12 additions and 0 deletions
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12
drivers/vfio/pci/vfio_pci_dmabuf.c
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@ -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,