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

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Date:   Thu, 17 Aug 2023 17:08:36 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        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>
Cc:     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, Yu Zhao <yuzhao@...gle.com>
Subject: Re: [PATCH] KVM: Wrap kvm_{gfn,hva}_range.pte in a per-action union

On Fri, 28 Jul 2023 17:41:44 -0700, Sean Christopherson 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).
> 
> [...]

Applied to kvm-x86 generic, with KVM_MMU_NOTIFIER_NO_ARG as suggested by Oliver.

[1/1] KVM: Wrap kvm_{gfn,hva}_range.pte in a per-action union
      https://github.com/kvm-x86/linux/commit/3e1efe2b67d3

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes