[PATCH v4 8/8] vfio: Validate dma-buf revocation semantics

[Leon Romanovsky]

From: Leon Romanovsky <leonro@xxxxxxxxxx>

Use the new dma_buf_attach_revocable() helper to restrict attachments to
importers that support mapping invalidation.

Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
---
 drivers/vfio/pci/vfio_pci_dmabuf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c
index 5fceefc40e27..85056a5a3faf 100644
--- a/drivers/vfio/pci/vfio_pci_dmabuf.c
+++ b/drivers/vfio/pci/vfio_pci_dmabuf.c
@@ -31,6 +31,9 @@ static int vfio_pci_dma_buf_attach(struct dma_buf *dmabuf,
 	if (priv->revoked)
 		return -ENODEV;
 
+	if (!dma_buf_attach_revocable(attachment))
+		return -EOPNOTSUPP;
+
 	return 0;
 }
 

-- 
2.52.0