func: static void net_vhost_link_down(VhostUserState *s, bool link_down)
  
  {
  
      s->nc.link_down = link_down;
  
  
  
      if (s->nc.peer) {
  
          s->nc.peer->link_down = link_down;
  
      }
  
  
  
      if (s->nc.info->link_status_changed) {
  
          s->nc.info->link_status_changed(&s->nc);
  
      }
  
  
  
      if (s->nc.peer && s->nc.peer->info->link_status_changed) {
  
          s->nc.peer->info->link_status_changed(s->nc.peer);
  
      }
  
  }
  