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i386/cpu: Warn about why CPUID_EXT_PDCM is not available

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When user requests PDCM explicitly via "+pdcm" without PMU enabled, emit
a warning to inform the user.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250304052450.465445-3-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li
2025-06-20 13:25:59 +02:00
committed by Paolo Bonzini
parent e68ec29809
commit 00268e0002
1 changed files with 3 additions and 0 deletions
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target/i386/cpu.c
+3
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@@ -8339,6 +8339,9 @@ void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
}
if (!cpu->enable_pmu) {
mark_unavailable_features(cpu, FEAT_1_ECX,
env->user_features[FEAT_1_ECX] & CPUID_EXT_PDCM,
"This feature is not available due to PMU being disabled");
env->features[FEAT_1_ECX] &= ~CPUID_EXT_PDCM;
}