> + push @$cpuFlags , '+cx16' if $conf->{ostype} eq 'win81';
Looking at the qemu source code in qemu/ target-i386/cpu.c:
{
.name = "kvm64",
.level = 5,
.vendor = CPUID_VENDOR_INTEL,
.family = 15,
.model = 6,
.stepping = 1,
/* Missing: CPUID_VME, CPUID_HT */
.features = PPRO_FEATURES |
CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
CPUID_PSE36,
/* Missing: CPUID_EXT_POPCNT, CPUID_EXT_MONITOR */
.ext_features = CPUID_EXT_SSE3 | CPUID_EXT_CX16,
/* Missing: CPUID_EXT2_PDPE1GB, CPUID_EXT2_RDTSCP */
.ext2_features = (PPRO_FEATURES & CPUID_EXT2_AMD_ALIASES) |
CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
/* Missing: CPUID_EXT3_LAHF_LM, CPUID_EXT3_CMP_LEG, CPUID_EXT3_EXTAPIC,
CPUID_EXT3_CR8LEG, CPUID_EXT3_ABM, CPUID_EXT3_SSE4A,
CPUID_EXT3_MISALIGNSSE, CPUID_EXT3_3DNOWPREFETCH,
CPUID_EXT3_OSVW, CPUID_EXT3_IBS, CPUID_EXT3_SVM */
.ext3_features = 0,
.xlevel = 0x80000008,
.model_id = "Common KVM processor"
},
So it seems that CPUID_EXT_CX16 is already set?
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