/usr/lib/linux-tools/4.4.0-1021-kvm/x86_energy_perf_policy is in linux-tools-4.4.0-1021-kvm 4.4.0-1021.26.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.4.0-1021-kvm/../../linux-kvm-tools-4.4.0-1021/x86_energy_perf_policy