virtio-net: don't dma while vm is stopped
DMA into memory while VM is stopped makes it
hard to debug migration (consequitive saves
result in different files).
Fixing this completely is a large effort,
this patch does this for virtio-net.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Jason Wang <jasowang@redhat.com>
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 1d61f19..43a2b3d 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -424,6 +424,9 @@
static int virtio_net_can_receive(VLANClientState *nc)
{
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
+ if (!n->vm_running) {
+ return 0;
+ }
if (!virtio_queue_ready(n->rx_vq) ||
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))