[PULL 22/35] hw/virtio: Add flatview update in vhost_user_cleanup()

[Michael S. Tsirkin]

From: Yuwei Zhang <zhangyuwei.9149@bytedance.com>

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>
---
 hw/virtio/vhost-user.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 360d9bc040..2c8556237f 100644
--- 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;
 }
 
-- 
MST