Re: [PATCH v5 03/26] x86/hyperv: Update 'struct hv_enlightened_vmcs' definition

[Sean Christopherson]

On Mon, Aug 22, 2022, Vitaly Kuznetsov wrote:
> So I reached out to Microsoft and their answer was that for all these new
> eVMCS fields (including *PerfGlobalCtrl) observing architectural VMX
> MSRs should be enough. *PerfGlobalCtrl case is special because of Win11
> bug (if we expose the feature in VMX feature MSRs but don't set
> CPUID.0x4000000A.EBX BIT(0) it just doesn't boot).

Does this mean that KVM-on-HyperV needs to avoid using the PERF_GLOBAL_CTRL fields
when the bit is not set?