linux-kernel - Re: [PATCH V3 1/2] KVM: x86/mmu: Verify shadow walk doesn't terminate early in page faults

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Date:   Fri, 24 Sep 2021 11:33:35 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        kvm@...r.kernel.org
Subject: Re: [PATCH V3 1/2] KVM: x86/mmu: Verify shadow walk doesn't terminate
 early in page faults

On 06/09/21 14:25, Lai Jiangshan wrote:
> Opportunistically use fault->goal-level instead of it.level in
> FNAME(fetch) to further clarify that KVM always installs the leaf SPTE at
> the target level.

This argument will go away when mmu_set_spte starts fishing out the 
level from the kvm_mmu_page role, but it makes a good point for now.

Paolo