linux-kernel - Re: [PATCH v4 2/5] KVM: x86: Move CPUID.(EAX=0x12,ECX=1) mangling to __kvm_update_cpuid

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Date:   Fri, 21 Jan 2022 19:13:32 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] KVM: x86: Move CPUID.(EAX=0x12,ECX=1) mangling to
 __kvm_update_cpuid_runtime()

On 1/21/22 14:28, Vitaly Kuznetsov wrote:
> To support comparing CPUID data update with what's already set for a vCPU
> all mangling needs to happen in __kvm_update_cpuid_runtime(), before
> 'vcpu->arch.cpuid_entries' is updated. CPUID.(EAX=0x12,ECX=1) is currently
> being mangled in kvm_vcpu_after_set_cpuid(), move it to
> __kvm_update_cpuid_runtime(). Split off cpuid_get_supported_xcr0() helper
> as 'vcpu->arch.guest_supported_xcr0' update needs (logically) to stay in
> kvm_vcpu_after_set_cpuid().
> 
> No functional change intended.

Since v3 is already on its way to Linus, I'll merge this patch next week.

Paolo