@@ -801,10 +801,6 @@ typedef struct FeatureWordInfo {
/* If type==MSR_FEATURE_WORD */
struct {
uint32_t index;
- struct { /*CPUID that enumerate this MSR*/
- FeatureWord cpuid_class;
- uint32_t cpuid_flag;
- } cpuid_dep;
} msr;
};
uint32_t tcg_features; /* Feature flags supported by TCG */
@@ -1218,10 +1214,6 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
},
.msr = {
.index = MSR_IA32_ARCH_CAPABILITIES,
- .cpuid_dep = {
- FEAT_7_0_EDX,
- CPUID_7_0_EDX_ARCH_CAPABILITIES
- }
},
},
[FEAT_CORE_CAPABILITY] = {
@@ -1238,14 +1230,30 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
},
.msr = {
.index = MSR_IA32_CORE_CAPABILITY,
- .cpuid_dep = {
- FEAT_7_0_EDX,
- CPUID_7_0_EDX_CORE_CAPABILITY,
- },
},
},
};
+typedef struct FeatureMask {
+ FeatureWord index;
+ uint32_t mask;
+} FeatureMask;
+
+typedef struct FeatureDep {
+ FeatureMask from, to;
+} FeatureDep;
+
+static FeatureDep feature_dependencies[] = {
+ {
+ .from = { FEAT_7_0_EDX, CPUID_7_0_EDX_ARCH_CAPABILITIES },
+ .to = { FEAT_ARCH_CAPABILITIES, ~0u },
+ },
+ {
+ .from = { FEAT_7_0_EDX, CPUID_7_0_EDX_CORE_CAPABILITY },
+ .to = { FEAT_CORE_CAPABILITY, ~0u },
+ },
+};
+
typedef struct X86RegisterInfo32 {
/* Name of register */
const char *name;
@@ -5063,9 +5071,26 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
{
CPUX86State *env = &cpu->env;
FeatureWord w;
+ int i;
GList *l;
Error *local_err = NULL;
+ for (l = plus_features; l; l = l->next) {
+ const char *prop = l->data;
+ object_property_set_bool(OBJECT(cpu), true, prop, &local_err);
+ if (local_err) {
+ goto out;
+ }
+ }
+
+ for (l = minus_features; l; l = l->next) {
+ const char *prop = l->data;
+ object_property_set_bool(OBJECT(cpu), false, prop, &local_err);
+ if (local_err) {
+ goto out;
+ }
+ }
+
/*TODO: Now cpu->max_features doesn't overwrite features
* set using QOM properties, and we can convert
* plus_features & minus_features to global properties
@@ -5083,19 +5108,18 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
}
}
- for (l = plus_features; l; l = l->next) {
- const char *prop = l->data;
- object_property_set_bool(OBJECT(cpu), true, prop, &local_err);
- if (local_err) {
- goto out;
- }
- }
+ for (i = 0; i < ARRAY_SIZE(feature_dependencies); i++) {
+ FeatureDep *d = &feature_dependencies[i];
+ if (!(env->features[d->from.index] & d->from.mask)) {
+ uint32_t unavailable_features = env->features[d->to.index] & d->to.mask;
- for (l = minus_features; l; l = l->next) {
- const char *prop = l->data;
- object_property_set_bool(OBJECT(cpu), false, prop, &local_err);
- if (local_err) {
- goto out;
+ /* Not an error unless the dependent feature was added explicitly. */
+ mark_unavailable_features(cpu, d->to.index,
+ unavailable_features & env->user_features[d->to.index],
+ "This feature depends on other features that were not requested");
+
+ env->user_features[d->to.index] |= unavailable_features;
+ env->features[d->to.index] &= ~unavailable_features;
}
}
Sometimes a CPU feature does not make sense unless another is present. In the case of VMX features, KVM does not even allow setting the VMX controls to some invalid combinations. Therefore, this patch adds a generic mechanism that looks for bits that the user explicitly cleared, and uses them to remove other bits from the expanded CPU definition. If these dependent bits were also explicitly *set* by the user, this will be a warning for "-cpu check" and an error for "-cpu enforce". If not, then the dependent bits are cleared silently, for convenience. With VMX features, this will be used so that for example "-cpu host,-rdrand" will also hide support for RDRAND exiting. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- target/i386/cpu.c | 72 ++++++++++++++++++++++++++++++++++++------------------- 1 file changed, 48 insertions(+), 24 deletions(-)