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i386/kvm: expose HV_CPUID_ENLIGHTMENT_INFO.EAX and HV_CPUID_NESTED_FEATURES.EAX as feature words

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It was found that QMP users of QEMU (e.g. libvirt) may need
HV_CPUID_ENLIGHTMENT_INFO.EAX/HV_CPUID_NESTED_FEATURES.EAX information. In
particular, 'hv_tlbflush' and 'hv_evmcs' enlightenments are only exposed in
HV_CPUID_ENLIGHTMENT_INFO.EAX.

HV_CPUID_NESTED_FEATURES.EAX is exposed for two reasons: convenience
(we don't need to export it from hyperv_handle_properties() and as
future-proof for Enlightened MSR-Bitmap, PV EPT invalidation and
direct virtual flush features.

Backports commit a2b107dbbd342ff2077aa5af705efaf68c375459 from qemu
This commit is contained in:
Vitaly Kuznetsov 2019-01-14 15:01:00 -05:00 committed by Lioncash
parent 3eb700bec7
commit 2873612479
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 34 additions and 0 deletions
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32
qemu/target/i386/cpu.c
View file

@ -1079,6 +1079,38 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
},
.cpuid = { .eax = 0x40000003, .reg = R_EDX, },
},
// FEAT_HV_RECOMM_EAX
{
.type = CPUID_FEATURE_WORD,
.feat_names = {
NULL /* hv_recommend_pv_as_switch */,
NULL /* hv_recommend_pv_tlbflush_local */,
NULL /* hv_recommend_pv_tlbflush_remote */,
NULL /* hv_recommend_msr_apic_access */,
NULL /* hv_recommend_msr_reset */,
NULL /* hv_recommend_relaxed_timing */,
NULL /* hv_recommend_dma_remapping */,
NULL /* hv_recommend_int_remapping */,
NULL /* hv_recommend_x2apic_msrs */,
NULL /* hv_recommend_autoeoi_deprecation */,
NULL /* hv_recommend_pv_ipi */,
NULL /* hv_recommend_ex_hypercalls */,
NULL /* hv_hypervisor_is_nested */,
NULL /* hv_recommend_int_mbec */,
NULL /* hv_recommend_evmcs */,
NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
},
.cpuid = { .eax = 0x40000004, .reg = R_EAX, },
},
// FEAT_HV_NESTED_EAX
{
.type = CPUID_FEATURE_WORD,
.cpuid = { .eax = 0x4000000A, .reg = R_EAX, },
},
// FEAT_SVM
{
.type = CPUID_FEATURE_WORD,

2
qemu/target/i386/cpu.h
View file

@ -476,6 +476,8 @@ typedef enum FeatureWord {
FEAT_HYPERV_EAX, /* CPUID[4000_0003].EAX */
FEAT_HYPERV_EBX, /* CPUID[4000_0003].EBX */
FEAT_HYPERV_EDX, /* CPUID[4000_0003].EDX */
FEAT_HV_RECOMM_EAX, /* CPUID[4000_0004].EAX */
FEAT_HV_NESTED_EAX, /* CPUID[4000_000A].EAX */
FEAT_SVM, /* CPUID[8000_000A].EDX */
FEAT_XSAVE, /* CPUID[EAX=0xd,ECX=1].EAX */
FEAT_6_EAX, /* CPUID[6].EAX */