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Currently whether audio works in virtio mediator or pass-through mode can be determined by checking the device file of vbs_k_audio But before the completion of loading audio virtio-BE module, the device file of /dev/vbs_k_audio doesn't exist. In such case in course of loading UOS, the incorrect work mode is selected for audio device (passthru instead of mediator). This is incorrect Tracked-On: projectacrn/acrn-hypervisor#2247 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Alek Du <alek.du@intel.com>