Don't notify virtio devices before S_DRIVER_OK (Mark McLoughlin)

Current Linux guests oops if the host notifies of a
config change before a driver has been bound to the
device.

It's pretty pointless for us to do notify of config
changes before status is S_DRIVER_OK anyway, so let's
just not do it.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6471 c046a42c-6fe2-441c-8c8c-71466251a162

diff --git a/hw/virtio.c b/hw/virtio.c
index 2e3984e6edfa2fc2459408cecda8769a2d0d9553..bb941eda7555bc370c4401995c447b4fb7d04e0d 100644 (file)
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -738,6 +738,9 @@ void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
 
 void virtio_notify_config(VirtIODevice *vdev)
 {
+    if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
+        return;
+
     vdev->isr |= 0x03;
     virtio_update_irq(vdev);
 }