hw/virtio: Add flatview update in vhost_user_cleanup()

Qemu will crash on vhost backend unexpected exit and re-connect                                                                          │
in some case due to access released memory.

Signed-off-by: Yuwei Zhang <zhangyuwei.9149@bytedance.com>
Message-Id: <20210830123433.45727-1-zhangyuwei.9149@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 360d9bc040ee0a909d562aed1593e8470d685211..2c8556237fbe924798c6f69ef03e693016cb8337 100644 (file)
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -2480,7 +2480,7 @@ void vhost_user_cleanup(VhostUserState *user)
     if (!user->chr) {
         return;
     }
-
+    memory_region_transaction_begin();
     for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
         if (user->notifier[i].addr) {
             object_unparent(OBJECT(&user->notifier[i].mr));
@@ -2488,6 +2488,7 @@ void vhost_user_cleanup(VhostUserState *user)
             user->notifier[i].addr = NULL;
         }
     }
+    memory_region_transaction_commit();
     user->chr = NULL;
 }