nixos-unstable d15ce739-f03e-4685-a67b-c836dc4d68d0 8388608 8388608 2 hvm /usr/share/OVMF/OVMF_CODE_4M.fd /var/lib/libvirt/qemu/nvram/nixos-unstable_VARS.fd destroy restart destroy /usr/bin/qemu-system-x86_64