KVM: nVMX: Support PERF_GLOBAL_CTRL with enlightened VMCS

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Enlightened VMCS v1 got updated and now includes the required fields
for loading PERF_GLOBAL_CTRL upon VMENTER/VMEXIT features. For KVM on
Hyper-V enablement, KVM can just observe VMX control MSRs and use the
features (with or without eVMCS) when possible.

Hyper-V on KVM is messier as Windows 11 guests fail to boot if the
controls are advertised and a new PV feature flag, CPUID.0x4000000A.EBX
BIT(0), is not set.  Honor the Hyper-V CPUID feature flag to play nice
with Windows guests.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20220830133737.1539624-16-vkuznets@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Vitaly Kuznetsov 2022-08-30 15:37:19 +02:00 • committed by Paolo Bonzini

parent 3ff8a13d41

commit 4da77090b0

4 changed files with 32 additions and 11 deletions

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2

arch/x86/kvm/hyperv.c

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arch/x86/kvm/vmx/evmcs.c

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arch/x86/kvm/vmx/evmcs.h

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arch/x86/kvm/vmx/vmx.c

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