CMT, MBM and CAT are configured using Model Specific Registers (MSRs)
to measure last level cache occupancy, set up the class of service masks and
manage the association of the cores/logical threads to a class of service.
The software executes in user space, and access to the MSRs is
obtained through a standard Linux* interface. The virtual file system
provides an interface to read and write the MSR registers but
it requires root privileges.