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-rw-r--r--target/i386/cpu.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index e89d9fa894..2d3b8d5dea 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1139,6 +1139,22 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
             .index = MSR_IA32_CORE_CAPABILITY,
         },
     },
+    [FEAT_PERF_CAPABILITIES] = {
+        .type = MSR_FEATURE_WORD,
+        .feat_names = {
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, "full-width-write", NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+        },
+        .msr = {
+            .index = MSR_IA32_PERF_CAPABILITIES,
+        },
+    },
 
     [FEAT_VMX_PROCBASED_CTLS] = {
         .type = MSR_FEATURE_WORD,
@@ -1317,6 +1333,10 @@ static FeatureDep feature_dependencies[] = {
         .to = { FEAT_CORE_CAPABILITY,       ~0ull },
     },
     {
+        .from = { FEAT_1_ECX,             CPUID_EXT_PDCM },
+        .to = { FEAT_PERF_CAPABILITIES,       ~0ull },
+    },
+    {
         .from = { FEAT_1_ECX,               CPUID_EXT_VMX },
         .to = { FEAT_VMX_PROCBASED_CTLS,    ~0ull },
     },
@@ -5488,6 +5508,9 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
             *ebx |= (cs->nr_cores * cs->nr_threads) << 16;
             *edx |= CPUID_HT;
         }
+        if (!cpu->enable_pmu) {
+            *ecx &= ~CPUID_EXT_PDCM;
+        }
         break;
     case 2:
         /* cache info: needed for Pentium Pro compatibility */