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i386/kvm: add support for Direct Mode for Hyper-V synthetic timers

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Hyper-V on KVM can only use Synthetic timers with Direct Mode (opting for
an interrupt instead of VMBus message). This new capability is only
announced in KVM_GET_SUPPORTED_HV_CPUID.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20190517141924.19024-10-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2019-05-17 16:19:24 +02:00 • committed by Paolo Bonzini
parent 8caba36db5
commit 128531d9e1
5 changed files with 23 additions and 0 deletions
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10
docs/hyperv.txt
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@ -174,6 +174,16 @@ without the feature to find out if enabling it is beneficial.
Requires: hv-vapic
3.17. hv-stimer-direct
=======================
Hyper-V specification allows synthetic timer operation in two modes: "classic",
when expiration event is delivered as SynIC message and "direct", when the event
is delivered via normal interrupt. It is known that nested Hyper-V can only
use synthetic timers in direct mode and thus 'hv-stimer-direct' needs to be
enabled.
Requires: hv-vpindex, hv-synic, hv-time, hv-stimer
4. Development features
========================