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virtio-net: don't dma while vm is stopped

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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>
This commit is contained in:
Michael S. Tsirkin 2010-11-22 19:52:19 +02:00
parent eff06c40d3
commit 9547732304
1 changed files with 3 additions and 0 deletions
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3
hw/virtio-net.c
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@ -424,6 +424,9 @@ static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
static int virtio_net_can_receive(VLANClientState *nc) static int virtio_net_can_receive(VLANClientState *nc)
{ {
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
if (!n->vm_running) {
return 0;
}
if (!virtio_queue_ready(n->rx_vq) || if (!virtio_queue_ready(n->rx_vq) ||
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))