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vduse: Support registering userspace memory for IOVA regions

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Introduce two ioctls: VDUSE_IOTLB_REG_UMEM and
VDUSE_IOTLB_DEREG_UMEM to support registering
and de-registering userspace memory for IOVA
regions.

Now it only supports registering userspace memory
for bounce buffer region in virtio-vdpa case.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220803045523.23851-5-xieyongji@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xie Yongji 2022-08-03 12:55:22 +08:00 • committed by Michael S. Tsirkin
parent 6c77ed2288
commit 79a463be9e
2 changed files with 164 additions and 0 deletions
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23
include/uapi/linux/vduse.h
View file

@ -210,6 +210,29 @@ struct vduse_vq_eventfd {
*/
#define VDUSE_VQ_INJECT_IRQ _IOW(VDUSE_BASE, 0x17, __u32)
/**
* struct vduse_iova_umem - userspace memory configuration for one IOVA region
* @uaddr: start address of userspace memory, it must be aligned to page size
* @iova: start of the IOVA region
* @size: size of the IOVA region
* @reserved: for future use, needs to be initialized to zero
*
* Structure used by VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM
* ioctls to register/de-register userspace memory for IOVA regions
*/
struct vduse_iova_umem {
__u64 uaddr;
__u64 iova;
__u64 size;
__u64 reserved[3];
};
/* Register userspace memory for IOVA regions */
#define VDUSE_IOTLB_REG_UMEM _IOW(VDUSE_BASE, 0x18, struct vduse_iova_umem)
/* De-register the userspace memory. Caller should set iova and size field. */
#define VDUSE_IOTLB_DEREG_UMEM _IOW(VDUSE_BASE, 0x19, struct vduse_iova_umem)
/* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */
/**