linux-kernel - Re: [PATCH] KVM: Wrap kvm_{gfn,hva}

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Date:   Mon, 31 Jul 2023 14:35:29 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Huacai Chen <chenhuacai@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: Wrap kvm_{gfn,hva}_range.pte in a per-action union

On Fri, Jul 28, 2023 at 6:41 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Wrap kvm_{gfn,hva}_range.pte in a union so that future notifier events can
> pass event specific information up and down the stack without needing to
> constantly expand and churn the APIs.  Lockless aging of SPTEs will pass
> around a bitmap, and support for memory attributes will pass around the
> new attributes for the range.
>
> Add a "KVM_NO_ARG" placeholder to simplify handling events without an
> argument (creating a dummy union variable is midly annoying).
>
> Opportunstically drop explicit zero-initialization of the "pte" field, as
> omitting the field (now a union) has the same effect.
>
> Cc: Yu Zhao <yuzhao@...gle.com>
> Link: https://lore.kernel.org/all/CAOUHufagkd2Jk3_HrVoFFptRXM=hX2CV8f+M-dka-hJU4bP8kw@mail.gmail.com
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Acked-by: Yu Zhao <yuzhao@...gle.com>