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i386/cpu: Clear FEAT_XSAVE_COMP_{LO,HI} when XSAVE is not available
Per Intel SDM vol 1, 13.2, if CPUID.1:ECX.XSAVE[bit 26] is 0, the processor provides no further enumeration through CPUID function 0DH. QEMU does not do this for "-cpu host,-xsave". Backports 19ca8285fcd61a8f60f2f44f789a561e0958e8e6
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@ -5363,6 +5363,8 @@ static void x86_cpu_enable_xsave_components(X86CPU *cpu)
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uint64_t mask;
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if (!(env->features[FEAT_1_ECX] & CPUID_EXT_XSAVE)) {
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env->features[FEAT_XSAVE_COMP_LO] = 0;
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env->features[FEAT_XSAVE_COMP_HI] = 0;
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return;
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}
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