MSR_RING_PERF_LIMIT_REASONS  327 arch/x86/include/asm/msr-index.h #define MSR_RING_PERF_LIMIT_REASONS	0x000006B1
MSR_RING_PERF_LIMIT_REASONS  556 tools/testing/selftests/kvm/include/x86_64/processor.h #define MSR_RING_PERF_LIMIT_REASONS	0x000006B1