Setting up a shared folder between virtual machine and host

Some quick notes on setting up a shared folder between a host computer and a virtual machine, using Debian 13 for both host and guest. This is great if you're working with untrusted files and want a safe place to work with them. (Another option is something like magic-wormhole , if network access is permitted.) The only really unintuitive thing is the virtiofs "target". I thought this was supposed…