[PATCH] vhost-user: save features of multiqueues if chardev is closed

["haibinzhang(张海斌)" <haibinzhang@tencent.com>]

Fore-commit(c6beefd674) only saves features of queue0,
this makes wrong features of other queues in multiqueues
situation.
For examples:
  qemu-system-aarch64 ... \
  -chardev socket,id=charnet0,path=/var/run/vhost_sock \
  -netdev vhost-user,chardev=charnet0,queues=2,id=hostnet0 \
  ...
There are two queues in nic assocated with one chardev.
When chardev is reconnected, it is necessary to save and
restore features of all queues.

Signed-of-by: Haibin Zhang <haibinzhang@tencent.com>
---
 net/vhost-user.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/vhost-user.c b/net/vhost-user.c
index 17532daaf3..ffbd94d944 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -226,7 +226,7 @@ static void chr_closed_bh(void *opaque)
     NetClientState *ncs[MAX_QUEUE_NUM];
     NetVhostUserState *s;
     Error *err = NULL;
-    int queues;
+    int queues, i;
 
     queues = qemu_find_net_clients_except(name, ncs,
                                           NET_CLIENT_DRIVER_NIC,
@@ -235,8 +235,12 @@ static void chr_closed_bh(void *opaque)
 
     s = DO_UPCAST(NetVhostUserState, nc, ncs[0]);
 
-    if (s->vhost_net) {
-        s->acked_features = vhost_net_get_acked_features(s->vhost_net);
+    for (i = queues -1; i >= 0; i--) {
+        s = DO_UPCAST(NetVhostUserState, nc, ncs[i]);
+
+        if (s->vhost_net) {
+            s->acked_features = vhost_net_get_acked_features(s->vhost_net);
+        }
     }
 
     qmp_set_link(name, false, &err);
-- 
2.23.0