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-rw-r--r--include/uapi/linux/vfio.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 87ee4f4cff25..916e444e6f74 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -362,10 +362,14 @@ struct vfio_iommu_type1_dma_map {
#define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13)
/**
- * VFIO_IOMMU_UNMAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 14, struct vfio_dma_unmap)
+ * VFIO_IOMMU_UNMAP_DMA - _IOWR(VFIO_TYPE, VFIO_BASE + 14,
+ * struct vfio_dma_unmap)
*
* Unmap IO virtual addresses using the provided struct vfio_dma_unmap.
- * Caller sets argsz.
+ * Caller sets argsz. The actual unmapped size is returned in the size
+ * field. No guarantee is made to the user that arbitrary unmaps of iova
+ * or size different from those used in the original mapping call will
+ * succeed.
*/
struct vfio_iommu_type1_dma_unmap {
__u32 argsz;

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