linux-kernel - Re: [RFC PATCH 24/35] KVM: SVM: Add support for CR8 write traps for an SEV-ES guest

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Date:   Tue, 15 Sep 2020 10:57:46 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [RFC PATCH 24/35] KVM: SVM: Add support for CR8 write traps for
 an SEV-ES guest

On 9/14/20 5:19 PM, Sean Christopherson wrote:
> On Mon, Sep 14, 2020 at 03:15:38PM -0500, Tom Lendacky wrote:
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index 5e5f1e8fed3a..6e445a76b691 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -1109,6 +1109,12 @@ unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
>>  }
>>  EXPORT_SYMBOL_GPL(kvm_get_cr8);
>>  
>> +int kvm_track_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
>> +{
>> +	return kvm_set_cr8(vcpu, cr8);
> 
> I'm guessing this was added to achieve consistency at the SVM call sites.
> With the previously suggested changes, kvm_track_cr8() can simply be
> dropped.

Yup.

Thanks,
Tom

> 
>> +}
>> +EXPORT_SYMBOL_GPL(kvm_track_cr8);
>> +
>>  static void kvm_update_dr0123(struct kvm_vcpu *vcpu)
>>  {
>>  	int i;
>> -- 
>> 2.28.0
>>