[Qemu-devel] [PATCH] virtio: don't call device on !vm_running

[Qemu-devel] [PATCH] virtio: don't call device on !vm_running

[Michael S. Tsirkin]

On vm stop, virtio changes vm_running state
too soon, so callbacks can get envoked with
vm_running = false;

Cc: qemu-stable@nongnu.org
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 5c98180..ac22238 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1108,7 +1108,10 @@ static void virtio_vmstate_change(void *opaque, int running, RunState state)
     BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
     bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
-    vdev->vm_running = running;
+
+    if (running) {
+        vdev->vm_running = running;
+    }
 
     if (backend_run) {
         virtio_set_status(vdev, vdev->status);
@@ -1121,6 +1124,10 @@ static void virtio_vmstate_change(void *opaque, int running, RunState state)
     if (!backend_run) {
         virtio_set_status(vdev, vdev->status);
     }
+
+    if (!running) {
+        vdev->vm_running = running;
+    }
 }
 
 void virtio_init(VirtIODevice *vdev, const char *name,
-- 
MST

Re: [Qemu-devel] [PATCH] virtio: don't call device on !vm_running

[Stefan Hajnoczi]

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On Thu, Sep 04, 2014 at 01:32:54PM +0300, Michael S. Tsirkin wrote:
> On vm stop, virtio changes vm_running state
> too soon, so callbacks can get envoked with
> vm_running = false;
> 
> Cc: qemu-stable@nongnu.org
> Cc: Jason Wang <jasowang@redhat.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  hw/virtio/virtio.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Thanks, applied to my net tree:
https://github.com/stefanha/qemu/commits/net

Stefan

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