linux-kernel - Re: [PATCH 0/2] KVM: x86/mmu: .change

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Message-ID: <CABgObfZ7MRShYm79NsH2=WwvTAcaoz5jUSBxPb57KEhotcr_oA@mail.gmail.com>
Date:   Thu, 7 Sep 2023 00:17:12 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Yan Zhao <yan.y.zhao@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] KVM: x86/mmu: .change_pte() optimization in TDP MMU

On Tue, Sep 5, 2023 at 10:18 PM Sean Christopherson <seanjc@...gle.com> wrote:
> Ooh, actually, maybe we could do
>
>         static bool <name_tbd> = !IS_ENABLED(CONFIG_KSM);
>
> and then cross our fingers that that doesn't regress some other funky setups.

It probably breaks gvisor-like setups that use MAP_PRIVATE mmap for
memslots? It would instantly break CoW even if memory is never
written.

Paolo