linux-kernel - Re: [RFC PATCH 2/6] KVM: X86: Walk shadow page starting with shadow_root

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Message-ID: <YdSvbsb5wt/WURtw@google.com>
Date:   Tue, 4 Jan 2022 20:34:54 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.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>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC PATCH 2/6] KVM: X86: Walk shadow page starting with
 shadow_root_level

On Fri, Dec 10, 2021, Lai Jiangshan wrote:
> From: Lai Jiangshan <laijs@...ux.alibaba.com>
> 
> Walking from the root page of the shadow page table should start with
> the level of the shadow page table: shadow_root_level.
> 
> Also change a small defect in audit_mappings(), it is believed
> that the current walking level is more valuable to print.
> 
> Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
> ---
>  arch/x86/kvm/mmu/mmu_audit.c | 5 ++---

I vote we remove mmu_audit.c.  It has bitrotted horribly, and none of the
current set of KVM developers even knows how to use it effectively.