The communication between Cortex-A + Cortex-M processors for Ethos-U NPU

According to the previous discussion for Ethos-U NPU, I know the current communication between Cortex-A and Cortex-M is using the Linux kernel mailbox APIs and virtio/rpmsg are not used. I want to know whether the current codes are sufficient to accomplish the communication between Cortex-A and Cortext-M. Do virtio and rpmsg need to be used?

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