linux-kernel - Re: [FYI PATCH] Revert "KVM: x86/mmu: Zap only TDP MMU leafs in kvm_zap_gfn

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Date:   Fri, 25 Mar 2022 12:21:28 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [FYI PATCH] Revert "KVM: x86/mmu: Zap only TDP MMU leafs in
 kvm_zap_gfn_range()"

On 3/25/22 00:57, Sean Christopherson wrote:
> Can I have 1-2 weeks to try and root cause and fix the underlying issue before
> sending reverts to Linus?  I really don't want to paper over a TLB flushing bug
> or an off-by-one bug, and I really, really don't want to end up with another
> scenario where KVM zaps everything just because.

Well, too late...  I didn't want to send a pull request that was broken, 
and Mingwei provided a convincing reason for the breakage.

Paolo