win11 a7b3c8d1-4e2f-5a6b-9c0d-1e2f3a4b5c6d 16 16 8 hvm /run/libvirt/nix-ovmf/edk2-x86_64-secure-code.fd /var/lib/libvirt/qemu/nvram/win11_VARS.fd destroy restart preserve /run/libvirt/nix-emulators/qemu-system-x86_64