linux-kernel - Re: [PATCH v4 21/25] KVM: VMX: Move LOAD_IA32_PERF_GLOBAL_CTRL errata handling out of setup_vmcs

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Date:   Thu, 28 Jul 2022 22:34:26 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 21/25] KVM: VMX: Move LOAD_IA32_PERF_GLOBAL_CTRL
 errata handling out of setup_vmcs_config()

On Fri, Jul 29, 2022, Paolo Bonzini wrote:
> On 7/22/22 00:56, Sean Christopherson wrote:
> > Except the errata are based on FMS and the FMS exposed to the L1 hypervisor may
> > not be the real FMS.
> > 
> > But that's moot, because they_should_  be fully emulated by KVM anyways; KVM
> > runs L2 with a MSR value modified by perf, not the raw MSR value requested by L1.
> > 
> > Of course KVM screws things up and fails to clear the flag in entry controls...
> > All exit controls are emulated so at least KVM gets those right.
> 
> Can you send this as a separate patch?

Will do.