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: NMichael S. Tsirkin <mst@redhat.com> Tested-by: NJason Wang <jasowang@redhat.com>
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