/usr/sbin/cpuperf-perfcntr is in xen-utils-common 4.4.0-0ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/sbin/../lib/xen-common/bin/xen-utils-wrapper
/usr/sbin/../lib/xen-common/bin/xen-utils-wrapper