nixos-unstable 8609e821-5ba2-47b4-997d-84ad84b45b53 4194304 4194304 4 hvm /run/libvirt/nix-ovmf/OVMF_CODE.fd /var/lib/libvirt/qemu/nvram/nixos-unstable_VARS.fd destroy restart destroy /run/libvirt/nix-emulators/qemu-system-x86_64