linux-kernel - Re: [PATCH v5 12/34] KVM: SVM: Add initial support for a VMGEXIT VMEXIT

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Date:   Tue, 15 Dec 2020 11:16:56 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        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: [PATCH v5 12/34] KVM: SVM: Add initial support for a VMGEXIT
 VMEXIT

On 14/12/20 20:41, Sean Christopherson wrote:
> I agree VMGEXIT should be added to the hot path, it could very well be the most
> common exit reason due to all instruction-based emulation getting funneled
> through VMGEXIT.

Yeah, I was thinking that not many guests will be SEV-ES.  On the other 
hand, it's quite likely to have an SEV-ES guest in your hands once the 
really common non-VMGEXITs have been eliminated.

Paolo