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vfio: Permit VFIO to work with pinned importers

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Till now VFIO has rejected pinned importers, largely to avoid being used
with the RDMA pinned importer that cannot handle a move_notify() to revoke
access.

Using dma_buf_attach_revocable() it can tell the difference between pinned
importers that support the flow described in dma_buf_invalidate_mappings()
and those that don't.

Thus permit compatible pinned importers.

This is one of two items IOMMUFD requires to remove its private interface
to VFIO's dma-buf.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Alex Williamson <alex@shazbot.org>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20260131-dmabuf-revoke-v7-7-463d956bd527@nvidia.com
This commit is contained in:
Leon Romanovsky 2026-01-31 07:34:17 +02:00 committed by Christian König
parent be6d4c9e9d
commit 6ffe939bf9
1 changed files with 3 additions and 12 deletions
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15
drivers/vfio/pci/vfio_pci_dmabuf.c
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@ -22,16 +22,6 @@ 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)
{
@ -43,6 +33,9 @@ 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;
}
@ -107,8 +100,6 @@ 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,