linux-kernel - Re: [RFC PATCH 3/6] KVM: Define kvm_flush_remote_tlbs

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Date:   Mon, 9 Jan 2023 15:45:30 -0800
From:   David Matlack <dmatlack@...gle.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
Cc:     Oliver Upton <oupton@...gle.com>, Marc Zyngier <maz@...nel.org>,
        Ricardo Koller <ricarkol@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 3/6] KVM: Define kvm_flush_remote_tlbs_range

On Mon, Jan 9, 2023 at 3:41 PM David Matlack <dmatlack@...gle.com> wrote:
>
> On Mon, Jan 09, 2023 at 09:53:44PM +0000, Raghavendra Rao Ananta wrote:
> > +{
> > +     kvm_flush_remote_tlbs(kvm);
> > +}
>
> FYI I also proposed a common kvm_flush_remote_tlbs() in my Common MMU
> series [1].
>
> Could I interest you in grabbing patches 29-33 from that series, which
> has the same end result (common kvm_flush_remote_tlbs_range()) but also
> hooks up the KVM/x86 range-based flushing, and folding them into this
> series?
>
> [1] https://lore.kernel.org/kvm/20221208193857.4090582-33-dmatlack@google.com/

(Also they make kvm_arch_flush_remote_tlbs_memslot() common so you
don't need the ARM-specific implementation in patch 4.)

>
> >  #endif
> >
> >  static void kvm_flush_shadow_all(struct kvm *kvm)
> > @@ -637,7 +642,7 @@ static __always_inline int __kvm_handle_hva_range(struct kvm *kvm,
> >       }
> >
> >       if (range->flush_on_ret && ret)
> > -             kvm_flush_remote_tlbs(kvm);
> > +             kvm_flush_remote_tlbs_range(kvm, range->start, range->end - 1);
> >
> >       if (locked) {
> >               KVM_MMU_UNLOCK(kvm);
> > --
> > 2.39.0.314.g84b9a713c41-goog
> >