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vfio: option to unmap all

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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@oracle.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Steve Sistare 2021-01-29 08:54:04 -08:00 committed by Alex Williamson
parent 1048ba83fb
commit c98fe7c2a2
1 changed files with 8 additions and 0 deletions
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8
include/uapi/linux/vfio.h
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@ -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
@ -1102,6 +1105,7 @@ 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
@ -1111,11 +1115,15 @@ 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 cannot 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[];