I believe that is intended to setup a special char device for doing 'extra' paravirtualization stuff. It's a communication path for doing copy-n-paste buffers and other things. The target_type=virtio ...

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KVM, the Linux kernel hypervisor, is the up-and-coming enterprise virtualization contender. It’s lean, mean, fast, and runs unmodified guest operating systems with ease. In this crash course we’ll ...

If I understand correctly (your single-paragraph post is IMHO a worse "wall of text" than anything I've ever posted, and I've been justly criticized for such posts), you have dual daisy-chained ...