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i386/kvm: add a comment explaining why .feat_names are commented out for Hyper-V feature bits

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Hyper-V .feat_names are, unlike hardware features, commented out and it is
not obvious why we do that. Document the current status quo.

Backports commit abd5fc4c862d033a989552914149f01c9476bb16 from qemu
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Vitaly Kuznetsov 2019-01-14 15:02:33 -05:00 committed by Lioncash
parent 2873612479
commit b6cc2c4e06
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7
qemu/target/i386/cpu.c
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@ -1025,6 +1025,13 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
.no_autoenable_flags = ~0U,*/
},
/*
* .feat_names are commented out for Hyper-V enlightenments because we
* don't want to have two different ways for enabling them on QEMU command
* line. Some features (e.g. "hyperv_time", "hyperv_vapic", ...) require
* enabling several feature bits simultaneously, exposing these bits
* individually may just confuse guests.
*/
// FEAT_HYPERV_EAX
{
.type = CPUID_FEATURE_WORD,