MSR_IA32_APERF    596 arch/x86/include/asm/msr-index.h #define MSR_IA32_APERF			0x000000e8
MSR_IA32_APERF    827 tools/testing/selftests/kvm/include/x86_64/processor.h #define MSR_IA32_APERF			0x000000e8