HWP_LOWEST_PERF
min_perf = HWP_LOWEST_PERF(READ_ONCE(cpu->hwp_cap_cached));
(unsigned int)HWP_GUARANTEED_PERF(msr), (unsigned int)HWP_MOSTEFFICIENT_PERF(msr), (unsigned int)HWP_LOWEST_PERF(msr));
cap->lowest = msr_perf_2_ratio(HWP_LOWEST_PERF(msr));