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i386: Implement pseudo 'hv-avic' ('hv-apicv') enlightenment

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The enlightenment allows to use Hyper-V SynIC with hardware APICv/AVIC
enabled. Normally, Hyper-V SynIC disables these hardware features and
suggests the guest to use paravirtualized AutoEOI feature. Linux-4.15
gains support for conditional APICv/AVIC disablement, the feature
stays on until the guest tries to use AutoEOI feature with SynIC. With
'HV_DEPRECATING_AEOI_RECOMMENDED' bit exposed, modern enough Windows/
Hyper-V versions should follow the recommendation and not use the
(unwanted) feature.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210902093530.345756-7-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-09-02 11:35:28 +02:00 • committed by Paolo Bonzini
parent 050716292a
commit e1f9a8e8c9
5 changed files with 24 additions and 2 deletions
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10
docs/hyperv.txt
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@ -189,7 +189,15 @@ enabled.
Requires: hv-vpindex, hv-synic, hv-time, hv-stimer
3.17. hv-no-nonarch-coresharing=on/off/auto
3.18. hv-avic (hv-apicv)
=======================
The enlightenment allows to use Hyper-V SynIC with hardware APICv/AVIC enabled.
Normally, Hyper-V SynIC disables these hardware feature and suggests the guest
to use paravirtualized AutoEOI feature.
Note: enabling this feature on old hardware (without APICv/AVIC support) may
have negative effect on guest's performace.
3.19. hv-no-nonarch-coresharing=on/off/auto
===========================================
This enlightenment tells guest OS that virtual processors will never share a
physical core unless they are reported as sibling SMT threads. This information