x86/cpufeatures: Add Architectural PerfMon Extension bit

CPUID.(EAX=07H, ECX=1):EAX[8] indicates whether the Architectural
PerfMon Extension leaf (CPUID leaf 23) is supported.

The "X86_FEATURE_..., word 12" is already mirrored from CPUID
"0x00000007:1 (EAX)". Add X86_FEATURE_ARCH_PERFMON_EXT under the
"word 12" section.

The new Architectural PerfMon Extension leaf (CPUID leaf 23) will be
supported in the perf_events subsystem later.

The feature will not appear in /proc/cpuinfo.

Signed-off-by: Kan Liang <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 61012476d66e0e131939f2146d248e1215b7b152..b64555b68a1473c0060667a8a571108e92104c82 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -312,6 +312,7 @@
 #define X86_FEATURE_AVX_VNNI           (12*32+ 4) /* AVX VNNI instructions */
 #define X86_FEATURE_AVX512_BF16                (12*32+ 5) /* AVX512 BFLOAT16 instructions */
 #define X86_FEATURE_CMPCCXADD           (12*32+ 7) /* "" CMPccXADD instructions */
+#define X86_FEATURE_ARCH_PERFMON_EXT   (12*32+ 8) /* "" Intel Architectural PerfMon Extension */
 #define X86_FEATURE_AMX_FP16           (12*32+21) /* "" AMX fp16 Support */
 #define X86_FEATURE_AVX_IFMA            (12*32+23) /* "" Support for VPMADD52[H,L]UQ */