virtio-pci: implement queue_enabled method
With version 1, we can detect whether a queue is enabled via queue_enabled. Signed-off-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NCindy Lu <lulu@redhat.com> Message-Id: <20200701145538.22333-5-lulu@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Acked-by: NJason Wang <jasowang@redhat.com>
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