virtio-net: stop/start bh when appropriate
Avoid sending out packets, and modifying memory, when VM is stopped. Add assert statements to verify this does not happen. Avoid scheduling bh when vhost-net is started. Stop bh when driver disabled bus mastering (we must not access memory after this). Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Tested-by: NJason Wang <jasowang@redhat.com>
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