For the UNMAP_DMA ioctl, delete all mappings if VFIO_DMA_UNMAP_FLAG_ALL
is set. Define the corresponding VFIO_UNMAP_ALL extension.
Signed-off-by: Steve Sistare <steven.sistare@xxxxxxxxxx>
---
include/uapi/linux/vfio.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 9204705..55578b6 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -46,6 +46,9 @@
*/
#define VFIO_NOIOMMU_IOMMU 8
+/* Supports VFIO_DMA_UNMAP_FLAG_ALL */
+#define VFIO_UNMAP_ALL 9
+
/*
* The IOCTL interface is designed for extensibility by embedding the
* structure length (argsz) and flags into structures passed between
@@ -1074,6 +1077,7 @@ struct vfio_bitmap {
* 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.
+ *
* VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP should be set to get the dirty bitmap
* before unmapping IO virtual addresses. When this flag is set, the user must
* provide a struct vfio_bitmap in data[]. User must provide zero-allocated
@@ -1083,11 +1087,15 @@ struct vfio_bitmap {
* indicates that the page at that offset from iova is dirty. A Bitmap of the
* pages in the range of unmapped size is returned in the user-provided
* vfio_bitmap.data.
+ *
+ * If flags & VFIO_DMA_UNMAP_FLAG_ALL, unmap all addresses. iova and size
+ * must be 0. This may not be combined with the get-dirty-bitmap flag.
*/
struct vfio_iommu_type1_dma_unmap {
__u32 argsz;
__u32 flags;
#define VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP (1 << 0)
+#define VFIO_DMA_UNMAP_FLAG_ALL (1 << 1)
__u64 iova; /* IO virtual address */
__u64 size; /* Size of mapping (bytes) */
__u8 data[];
--
1.8.3.1
