rte_vhost_enqueue/dequeue_brust thread safely?

Hi, ALL: 
1. for api "rte_vhost_dequeue_burst", is it safely called from muitiple thread/process on 17.11?, just as single-produce multiple consume


2. for api "rte_vhost_enqueue_burst", is it safely called from muitiple thread/process on 17.11? just as multi-produce single consume


3. I find that "The function rte_vhost_enqueue_burst no longer supports concurrent enqueuing packets to the same queue"  from release nodes of dpdk16.07, why not support  this?  perfermance issue or other reasons? 




thanks!