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VFIO fix for v6.19-rc8

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- Fix a gap in the initial VFIO DMABUF implementation where it's
    required to explicitly implement a failing pin callback to prevent
    pinned importers that cannot properly support move_notify.
    (Leon Romanovsky)
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Merge tag 'vfio-v6.19-rc8' of https://github.com/awilliam/linux-vfio

Pull VFIO fix from Alex Williamson:

 - Fix a gap in the initial VFIO DMABUF implementation where it's
   required to explicitly implement a failing pin callback to prevent
   pinned importers that cannot properly support move_notify.
   (Leon Romanovsky)

* tag 'vfio-v6.19-rc8' of https://github.com/awilliam/linux-vfio:
  vfio: Prevent from pinned DMABUF importers to attach to VFIO DMABUF
This commit is contained in:
Linus Torvalds 2026-01-27 10:39:17 -08:00
commit 1f97d9dcf5
1 changed files with 12 additions and 0 deletions
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12
drivers/vfio/pci/vfio_pci_dmabuf.c
View File

@ -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,