linux-kernel - Re: [PATCH 21/24] KVM: x86/mmu: Tweak auditing WARN for A/D bits to !PRESENT (was MMIO)

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Date:   Fri, 7 May 2021 01:05:18 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.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, Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH 21/24] KVM: x86/mmu: Tweak auditing WARN for A/D bits to
 !PRESENT (was MMIO)

On Thu, 25 Feb 2021 12:47:46 -0800
Sean Christopherson <seanjc@...gle.com> wrote:

> Tweak the MMU_WARN that guards against weirdness when querying A/D
> status to fire on a !MMU_PRESENT SPTE, as opposed to a MMIO SPTE.
> Attempting to query A/D status on any kind of !MMU_PRESENT SPTE, MMIO
> or otherwise, indicates a KVM bug.  Case in point, several now-fixed
> bugs were identified by enabling this new WARN.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

You made the 1.000.000th commit, congrats!

$ git log --oneline --reverse |sed '1000000!d'
8f366ae6d8c5 KVM: x86/mmu: Tweak auditing WARN for A/D bits to !PRESENT (was MMIO)

Cheers,
-- 
per aspera ad upstream