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This work is a stepping stone toward other forms of virtio-msg.

It leverages work done in prior projects to unblock the kernel work on the common virtio-msg transport layer.

• The virtio-msg-bus level here is not intended for real implementations as it has no advantage over virtio-mmio.

• It also assumes that the device driver side can see all of the memory of the driver sidekernel can put buffers anywhere it chooses to and uses Guest PA in virtqueues.

These items will be addressed in later work.