linux-kernel - Re: [PATCH v2 7/7] KVM: VMX: Only context switch some PT MSRs when they exist

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Message-ID: <96d0ff43-9b25-5f07-3fe8-7bd245ce06e4@redhat.com>
Date:   Mon, 18 Oct 2021 17:20:48 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        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 v2 7/7] KVM: VMX: Only context switch some PT MSRs when
 they exist

On 18/10/21 16:04, Xiaoyao Li wrote:
>>
>> If intel_pt_validate_hw_cap is not fast enough, it should be optimized.
>> Something like this:
> 
> If I understand correctly, you mean we don't need to cache the existence 
> with two variable, right?
> 

Yes, exactly.

Paolo