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target-i386: Remove SSE4a from qemu64 CPU model

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SSE4a is not available in any Intel CPU, and we want to make the default
CPU runnable in most hosts, so it doesn't make sense to enable it by
default in KVM mode.

We should eventually have all features supported by TCG enabled by
default in TCG mode, but as we don't have a good mechanism today to
ensure we have different defaults in KVM and TCG mode, disable SSE4a in
the qemu64 CPU model entirely.

Backports commit 0909ad24b2769368716c85f79fbb995dbb7041a9 from qemu
This commit is contained in:
Eduardo Habkost 2018-02-17 15:31:48 -05:00 committed by Lioncash
parent 3907ea1a3b
commit d108029fb3
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1 changed files with 1 additions and 1 deletions
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qemu/target-i386/cpu.c
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@ -684,7 +684,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
// FEAT_8000_0001_ECX
CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM |
CPUID_EXT3_ABM | CPUID_EXT3_SSE4A,
CPUID_EXT3_ABM,
},
},
{