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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-12-21 15:16:04 +0100 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2019-01-14 12:28:44 -0200 |
| commit | abd5fc4c862d033a989552914149f01c9476bb16 (patch) | |
| tree | ea941b6b2a3ceff404d1a95261b5f312013801e6 /target/i386/cpu.c | |
| parent | 258fe08bd341d2e230676228307294e41f33002c (diff) | |
| download | focaccia-qemu-abd5fc4c862d033a989552914149f01c9476bb16.tar.gz focaccia-qemu-abd5fc4c862d033a989552914149f01c9476bb16.zip | |
i386/kvm: add a comment explaining why .feat_names are commented out for Hyper-V feature bits
Hyper-V .feat_names are, unlike hardware features, commented out and it is not obvious why we do that. Document the current status quo. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20181221141604.16935-1-vkuznets@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'target/i386/cpu.c')
| -rw-r--r-- | target/i386/cpu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 3ece83696e..2f5412592d 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -929,6 +929,13 @@ 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, .feat_names = { |