MSR_IA32_MPERF    595 arch/x86/include/asm/msr-index.h #define MSR_IA32_MPERF			0x000000e7
MSR_IA32_MPERF    826 tools/testing/selftests/kvm/include/x86_64/processor.h #define MSR_IA32_MPERF			0x000000e7