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>
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@ -424,6 +424,9 @@ static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
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static int virtio_net_can_receive(VLANClientState *nc)
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static int virtio_net_can_receive(VLANClientState *nc)
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{
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{
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VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
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VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
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if (!n->vm_running) {
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return 0;
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}
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if (!virtio_queue_ready(n->rx_vq) ||
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if (!virtio_queue_ready(n->rx_vq) ||
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
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