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    Subject[PATCH vhost 04/16] vhost-vdpa: uAPI to get dedicated descriptor group id
    Date
    From: Si-Wei Liu <si-wei.liu@oracle.com>

    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>
    ---
    drivers/vhost/vdpa.c | 10 ++++++++++
    include/uapi/linux/vhost.h | 8 ++++++++
    2 files changed, 18 insertions(+)

    diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
    index 2f21798a37ee..851535f57b95 100644
    --- a/drivers/vhost/vdpa.c
    +++ b/drivers/vhost/vdpa.c
    @@ -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;
    diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
    index f5c48b61ab62..649560c685f1 100644
    --- a/include/uapi/linux/vhost.h
    +++ b/include/uapi/linux/vhost.h
    @@ -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
    --
    2.41.0
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