From 7625162ca4e7be6359571d98b1c9e983393e9d91 Mon Sep 17 00:00:00 2001
From: aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Thu, 29 Jan 2009 17:02:13 +0000
Subject: [PATCH] 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
---
 hw/virtio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/virtio.c b/hw/virtio.c
index 2e3984e6ed..bb941eda75 100644
--- 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);
 }