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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.

• This bus implementation relies on any response being available immediately after sending, which is only possible in a trap and emulate environment

• It also assumes that the driver side kernel can put buffers anywhere it chooses to and uses Guest PA in virtqueues.

These items will be addressed in later work.