vfio: option to unmap all

For the UNMAP_DMA ioctl, delete all mappings if VFIO_DMA_UNMAP_FLAG_ALL is set. Define the corresponding VFIO_UNMAP_ALL extension.

Steve Sistare committed 5 years ago

Commit c98fe7c1 parent 1048ba81 file · +8 −0Browse files

Showing the changes to include/uapi (1 of 1 file). Show all

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include/uapi/linux/vfio.h+8−0

@@ -46,6 +46,9 @@ · 45 unmodified lines
46	46	*/
47	47	#define VFIO_NOIOMMU_IOMMU 8
48	48
	49	+/* Supports VFIO_DMA_UNMAP_FLAG_ALL */
	50	+#define VFIO_UNMAP_ALL 9
	51	+
49	52	/*
50	53	* The IOCTL interface is designed for extensibility by embedding the
51	54	* structure length (argsz) and flags into structures passed between
@@ -1102,6 +1105,7 @@ struct vfio_bitmap { · 1050 unmodified lines
1102	1105	* field. No guarantee is made to the user that arbitrary unmaps of iova
1103	1106	* or size different from those used in the original mapping call will
1104	1107	* succeed.
	1108	+ *
1105	1109	* VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP should be set to get the dirty bitmap
1106	1110	* before unmapping IO virtual addresses. When this flag is set, the user must
1107	1111	* provide a struct vfio_bitmap in data[]. User must provide zero-allocated
@@ -1111,11 +1115,15 @@ struct vfio_bitmap { · 3 unmodified lines
1111	1115	* indicates that the page at that offset from iova is dirty. A Bitmap of the
1112	1116	* pages in the range of unmapped size is returned in the user-provided
1113	1117	* vfio_bitmap.data.
	1118	+ *
	1119	+ * If flags & VFIO_DMA_UNMAP_FLAG_ALL, unmap all addresses. iova and size
	1120	+ * must be 0. This cannot be combined with the get-dirty-bitmap flag.
1114	1121	*/
1115	1122	struct vfio_iommu_type1_dma_unmap {
1116	1123	__u32 argsz;
1117	1124	__u32 flags;
1118	1125	#define VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP (1 << 0)
	1126	+#define VFIO_DMA_UNMAP_FLAG_ALL (1 << 1)
1119	1127	__u64 iova; /* IO virtual address */
1120	1128	__u64 size; /* Size of mapping (bytes) */
1121	1129	__u8 data[];