Commit c98fe7c2 authored by Steve Sistare's avatar Steve Sistare Committed by Alex Williamson
Browse files

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.

Signed-off-by: default avatarSteve Sistare <steven.sistare@oracle.com>
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 1048ba83

include/uapi/linux/vfio.h

+8 −0
Original line number Diff line number Diff line
@@ -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[];