SYSENTER fix for x86_64 CPUs
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1565 c046a42c-6fe2-441c-8c8c-71466251a162
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kqemu.c
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kqemu.c
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@ -119,13 +119,19 @@ static void kqemu_update_cpuid(CPUState *env)
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critical_features_mask =
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critical_features_mask =
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CPUID_CMOV | CPUID_CX8 |
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CPUID_CMOV | CPUID_CX8 |
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CPUID_FXSR | CPUID_MMX | CPUID_SSE |
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CPUID_FXSR | CPUID_MMX | CPUID_SSE |
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CPUID_SSE2;
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CPUID_SSE2 | CPUID_SEP;
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if (!is_cpuid_supported()) {
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if (!is_cpuid_supported()) {
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features = 0;
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features = 0;
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} else {
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} else {
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cpuid(1, eax, ebx, ecx, edx);
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cpuid(1, eax, ebx, ecx, edx);
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features = edx;
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features = edx;
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}
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}
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#ifdef __x86_64__
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/* NOTE: on x86_64 CPUs, SYSENTER is not supported in
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compatibility mode, so in order to have the best performances
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it is better not to use it */
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features &= ~CPUID_SEP;
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#endif
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env->cpuid_features = (env->cpuid_features & ~critical_features_mask) |
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env->cpuid_features = (env->cpuid_features & ~critical_features_mask) |
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(features & critical_features_mask);
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(features & critical_features_mask);
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/* XXX: we could update more of the target CPUID state so that the
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/* XXX: we could update more of the target CPUID state so that the
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