vhost: introduce vhost_backend_get_vq_index method
Minusing the idx with the base(dev->vq_index) for vhost-kernel, and then adding it back for vhost-user doesn't seem right. Here introduces a new method vhost_backend_get_vq_index() for getting the right vq index for following vhost messages calls. Suggested-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NYuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: NJason Wang <jasowang@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NYuanhan Liu <yuanhan.liu@linux.intel.com> Tested-by: NMarcel Apfelbaum <marcel@redhat.com>
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