From: DaanDeMeyer on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2817#note_1695...
Note that with a systemd based initrd without dracut it's sufficient to add
"root=<tag> rootfstype=virtiofs rw" to boot from virtiofs (with or
without
initrd if virtiofs is builtin). I haven't had to add anything from dracut to
the initrd to get this working in mkosi. But I guess in this case the virtiofs
module is at least required to pull in the kernel module. Not sure what else
it does.