diff options
| author | Leon Romanovsky <leonro@nvidia.com> | 2026-01-21 17:45:02 +0200 |
|---|---|---|
| committer | Alex Williamson <alex@shazbot.org> | 2026-01-23 08:47:48 -0700 |
| commit | 61ceaf236115f20f4fdd7cf60f883ada1063349a (patch) | |
| tree | 9472815d3211e292c4664d9650f83d0216d5d17d | |
| parent | 24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7 (diff) | |
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: 5d74781ebc86 ("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>
| -rw-r--r-- | drivers/vfio/pci/vfio_pci_dmabuf.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c index d4d0f7d08c53..4be4a85005cb 100644 --- a/drivers/vfio/pci/vfio_pci_dmabuf.c +++ b/drivers/vfio/pci/vfio_pci_dmabuf.c @@ -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, |