target/i386: pass X86CPU to x86_cpu_get_supported_feature_word

This allows modifying the bits in "-cpu max"/"-cpu host" depending on
the guest CPU vendor (which, at least by default, is the host vendor in
the case of KVM).

For example, machine check architecture differs between Intel and AMD,
and bits from AMD should be dropped when configuring the guest for
an Intel model.

Cc: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: John Allen <john.allen@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 4c2e6f3a71e9ee2a58fe39beccff633a9bef0041..4364cb0f8e3eea5f289da7f9c60fa6a692bbc818 100644 (file)
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6035,8 +6035,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 
 #endif /* !CONFIG_USER_ONLY */
 
-uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
-                                            bool migratable_only)
+uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w)
 {
     FeatureWordInfo *wi = &feature_word_info[w];
     uint64_t r = 0;
@@ -6078,7 +6077,7 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
         r &= ~unavail;
     }
 #endif
-    if (migratable_only) {
+    if (cpu && cpu->migratable) {
         r &= x86_cpu_get_migratable_flags(w);
     }
     return r;
@@ -7371,7 +7370,7 @@ void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
              * by the user.
              */
             env->features[w] |=
-                x86_cpu_get_supported_feature_word(w, cpu->migratable) &
+                x86_cpu_get_supported_feature_word(cpu, w) &
                 ~env->user_features[w] &
                 ~feature_word_info[w].no_autoenable_flags;
         }
@@ -7497,7 +7496,7 @@ static void x86_cpu_filter_features(X86CPU *cpu, bool verbose)
 
     for (w = 0; w < FEATURE_WORDS; w++) {
         uint64_t host_feat =
-            x86_cpu_get_supported_feature_word(w, false);
+            x86_cpu_get_supported_feature_word(NULL, w);
         uint64_t requested_features = env->features[w];
         uint64_t unavailable_features = requested_features & ~host_feat;
         mark_unavailable_features(cpu, w, unavailable_features, prefix);
@@ -7617,7 +7616,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
         env->features[FEAT_PERF_CAPABILITIES] & PERF_CAP_LBR_FMT;
     if (requested_lbr_fmt && kvm_enabled()) {
         uint64_t host_perf_cap =
-            x86_cpu_get_supported_feature_word(FEAT_PERF_CAPABILITIES, false);
+            x86_cpu_get_supported_feature_word(NULL, FEAT_PERF_CAPABILITIES);
         unsigned host_lbr_fmt = host_perf_cap & PERF_CAP_LBR_FMT;
 
         if (!cpu->enable_pmu) {

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 29daf370485732dc8584f6c5343a419b1fab883d..9bea7142bf4b270940068ea8cb9d58fcd489c1ff 100644 (file)
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -666,8 +666,7 @@ typedef enum FeatureWord {
 } FeatureWord;
 
 typedef uint64_t FeatureWordArray[FEATURE_WORDS];
-uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
-                                            bool migratable_only);
+uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w);
 
 /* cpuid_features bits */
 #define CPUID_FP87 (1U << 0)

diff --git a/target/i386/kvm/kvm-cpu.c b/target/i386/kvm/kvm-cpu.c
index d57a68a301e6507845c68b2e193eb1b7ef771da9..6bf8dcfc607d90c68c10bed008814f9ffbf719d4 100644 (file)
--- a/target/i386/kvm/kvm-cpu.c
+++ b/target/i386/kvm/kvm-cpu.c
@@ -143,7 +143,7 @@ static void kvm_cpu_xsave_init(void)
         if (!esa->size) {
             continue;
         }
-        if ((x86_cpu_get_supported_feature_word(esa->feature, false) & esa->bits)
+        if ((x86_cpu_get_supported_feature_word(NULL, esa->feature) & esa->bits)
             != esa->bits) {
             continue;
         }