[PATCH v12 01/25] x86/cpufeatures: Add missing CQM feature dependency
From: Tony Luck
Date: Wed Sep 16 2026 - 19:13:46 EST
The Intel Software Developer's Manual says that software must check that
CPUID(0x7,0x0).EBX[12] (Linux X86_FEATURE_CQM) is set before checking
for monitoring features in CPUID leaf 0xF.
Add the missing dependency of X86_FEATURE_CQM_LLC on X86_FEATURE_CQM.
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
v12:
Drop the X86_FEATURE renames. Just add the missing dependency.
---
arch/x86/kernel/cpu/cpuid-deps.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 99801e844b30..93d45b688f6c 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -67,6 +67,7 @@ static const struct cpuid_dep cpuid_deps[] = {
{ X86_FEATURE_AVX512_4FMAPS, X86_FEATURE_AVX512F },
{ X86_FEATURE_AVX512_VPOPCNTDQ, X86_FEATURE_AVX512F },
{ X86_FEATURE_AVX512_VP2INTERSECT, X86_FEATURE_AVX512VL },
+ { X86_FEATURE_CQM_LLC, X86_FEATURE_CQM },
{ X86_FEATURE_CQM_OCCUP_LLC, X86_FEATURE_CQM_LLC },
{ X86_FEATURE_CQM_MBM_TOTAL, X86_FEATURE_CQM_LLC },
{ X86_FEATURE_CQM_MBM_LOCAL, X86_FEATURE_CQM_LLC },
--
2.55.0