Comment by PunchyHamster

> Given how slow protobufs and grpc is, I wonder if the socket transport would ever be the bottleneck to throughput here.

I think this is supposed to be option for when you want to pass stuff to host quickly without writing another device driver or using other interface rather than replacement for any rpc between VMs. "Being fast" is just a bonus.

For example at our job we use serial port for the communication with VM agent (it's just passing some host info about where VM is running, so our automation system can pick it up), this would be ideal replacement for that.

And as it is "just a socket", stuff like this is pretty easy to setup https://libvirt.org/ssh-proxy.html