the primary API realization.
Signed-off-by: NPeng Hao <peng.hao2@zte.com.cn>
Reviewed-by: NEduardo Habkost <ehabkost@redhat.com>
Message-Id: <1539795177-21038-3-git-send-email-peng.hao2@zte.com.cn>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>