[Qemu-devel] [PATCH 4/5] virtio: Don't change "started" flag on virtio_vmstate_change()

[elohimes]

From: Xie Yongji <address@hidden>

We will call virtio_set_status() on virtio_vmstate_change().
The "started" flag should not be changed in this case. Otherwise,
we may get an incorrect value when we set "started" flag but
not set DRIVER_OK in source VM.

Signed-off-by: Xie Yongji <address@hidden>
---
 hw/virtio/virtio.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 8a81374492..9e17293d46 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1162,9 +1162,13 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val)
             }
         }
     }
-    vdev->started = val & VIRTIO_CONFIG_S_DRIVER_OK;
-    if (unlikely(vdev->start_on_kick && vdev->started)) {
-        vdev->start_on_kick = false;
+
+    if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) !=
+        (val & VIRTIO_CONFIG_S_DRIVER_OK)) {
+        vdev->started = val & VIRTIO_CONFIG_S_DRIVER_OK;
+        if (unlikely(vdev->start_on_kick && vdev->started)) {
+            vdev->start_on_kick = false;
+        }
     }
 
     if (k->set_status) {
-- 
2.17.1