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target-i386: Introduce X86CPU::filtered_features field

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This field will contain the feature bits that were filtered out because
of missing host support.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Eduardo Habkost 2013-05-06 13:20:08 -03:00 committed by Andreas Färber
parent 8e8aba5054
commit 034acf4a58
2 changed files with 9 additions and 3 deletions
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3
target-i386/cpu-qom.h
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@ -65,6 +65,9 @@ typedef struct X86CPU {
/*< public >*/
CPUX86State env;
/* Features that were filtered out because of missing host capabilities */
uint32_t filtered_features[FEATURE_WORDS];
} X86CPU;
static inline X86CPU *x86_env_get_cpu(CPUX86State *env)

9
target-i386/cpu.c
View File

@ -1698,9 +1698,12 @@ static void filter_features_for_kvm(X86CPU *cpu)
for (w = 0; w < FEATURE_WORDS; w++) {
FeatureWordInfo *wi = &feature_word_info[w];
env->features[w] &= kvm_arch_get_supported_cpuid(s, wi->cpuid_eax,
wi->cpuid_ecx,
wi->cpuid_reg);
uint32_t host_feat = kvm_arch_get_supported_cpuid(s, wi->cpuid_eax,
wi->cpuid_ecx,
wi->cpuid_reg);
uint32_t requested_features = env->features[w];
env->features[w] &= host_feat;
cpu->filtered_features[w] = requested_features & ~env->features[w];
}
}
#endif