qemu/virtio: mark msi vectors used on load
Usage of msi vectors is controlled by the guest and so needs to be restored on load. Do this for msi vectors used by the virtio device. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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