MSR_IA32_PERFCTR0   57 arch/x86/include/asm/msr-index.h #define MSR_IA32_PERFCTR0		0x000000c1
MSR_IA32_PERFCTR0  375 tools/testing/selftests/kvm/include/x86_64/processor.h #define MSR_IA32_PERFCTR0		0x000000c1