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

From: Leon Romanovsky leonro@nvidia.com

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

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