I GOT A KVM ZONE 🎉 No rush to buy new hardware 😁 found the missing man page https://github.com/OpenIndiana/pkg5/blob/oi/doc/kvm.md But more tweaking was done Stock #OpenIndiana kvm brands init file ( /usr/lib/brand/kvm/init ) contains static args that NixOS doesn't like ( args.extend ) -no-hpet i deleted that line and #NixOS boots in a #kvm #zone