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vhost-vdpa: uAPI to get dedicated descriptor group id

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With _F_DESC_ASID backend feature, the device can now support the
VHOST_VDPA_GET_VRING_DESC_GROUP ioctl, and it may expose the descriptor
table (including avail and used ring) in a different group than the
buffers it contains. This new uAPI will fetch the group ID of the
descriptor table.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20231018171456.1624030-6-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Tested-by: Si-Wei Liu <si-wei.liu@oracle.com>
Tested-by: Lei Yang <leiyang@redhat.com>
This commit is contained in:
Si-Wei Liu 2023-10-18 20:14:43 +03:00 committed by Michael S. Tsirkin
parent 7db0d6027e
commit c8068d9bae
2 changed files with 18 additions and 0 deletions
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10
drivers/vhost/vdpa.c
View File

@ -613,6 +613,16 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
else if (copy_to_user(argp, &s, sizeof(s)))
return -EFAULT;
return 0;
case VHOST_VDPA_GET_VRING_DESC_GROUP:
if (!vhost_vdpa_has_desc_group(v))
return -EOPNOTSUPP;
s.index = idx;
s.num = ops->get_vq_desc_group(vdpa, idx);
if (s.num >= vdpa->ngroups)
return -EIO;
else if (copy_to_user(argp, &s, sizeof(s)))
return -EFAULT;
return 0;
case VHOST_VDPA_SET_GROUP_ASID:
if (copy_from_user(&s, argp, sizeof(s)))
return -EFAULT;

8
include/uapi/linux/vhost.h
View File

@ -219,4 +219,12 @@
*/
#define VHOST_VDPA_RESUME _IO(VHOST_VIRTIO, 0x7E)
/* Get the group for the descriptor table including driver & device areas
* of a virtqueue: read index, write group in num.
* The virtqueue index is stored in the index field of vhost_vring_state.
* The group ID of the descriptor table for this specific virtqueue
* is returned via num field of vhost_vring_state.
*/
#define VHOST_VDPA_GET_VRING_DESC_GROUP _IOWR(VHOST_VIRTIO, 0x7F, \
struct vhost_vring_state)
#endif