linux-kernel - Re: [PATCH v4 2/5] KVM: x86: Extract kvm_update_cpuid_runtime() from kvm_update

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Date:   Thu, 9 Jul 2020 12:55:37 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] KVM: x86: Extract kvm_update_cpuid_runtime() from
 kvm_update_cpuid()

On 09/07/20 06:34, Xiaoyao Li wrote:
> Beside called in kvm_vcpu_ioctl_set_cpuid*(), kvm_update_cpuid() is also
> called 5 places else in x86.c and 1 place else in lapic.c. All those 6
> places only need the part of updating guest CPUIDs (OSXSAVE, OSPKE, APIC,
> KVM_FEATURE_PV_UNHALT, ...) based on the runtime vcpu state, so extract
> them as a separate kvm_update_cpuid_runtime().

I'm not sure KVM_FEATURE_PV_UNHALT counts as one of these, but I guess
it's not a big deal.

Paolo