whitelist host virtio networking features

This patch is a followup to 8eca6b1b,
fixing crashes when guests with 2.6.25 virtio drivers have saturated
virtio network connections.

https://bugs.edge.launchpad.net/ubuntu/+source/qemu-kvm/+bug/458521

That patch should have been whitelisting *_HOST_* rather than the the
*_GUEST_* features.

I tested this by running an Ubuntu 8.04 Hardy guest (2.6.24 kernel +
2.6.25-virtio driver).  I saturated both the incoming, and outgoing
network connection with nc, seeing sustained 6MB/s up and 6MB/s down
bitrates for ~20 minutes.  Previously, this crashed immediately.  Now,
the guest does not crash and maintains network connectivity throughout
the test.
Signed-off-by: NDustin Kirkland <kirkland@canonical.com>
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/virtio-net.c

@@ -187,10 +187,10 @@ static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
     /* Linux kernel 2.6.25.  It understood MAC (as everyone must),
      * but also these: */
     features |= (1 << VIRTIO_NET_F_MAC);
-    features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
-    features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
-    features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
-    features |= (1 << VIRTIO_NET_F_GUEST_ECN);
+    features |= (1 << VIRTIO_NET_F_CSUM);
+    features |= (1 << VIRTIO_NET_F_HOST_TSO4);
+    features |= (1 << VIRTIO_NET_F_HOST_TSO6);
+    features |= (1 << VIRTIO_NET_F_HOST_ECN);
 
     return features & virtio_net_get_features(vdev);
 }