linux-kernel - Re: [PATCH v2 4/6] KVM: x86/mmu: Track the number of TDP MMU pages, but not the actual pages

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Message-ID: <Yt8m1xWgwLP1Ecw9@google.com>
Date:   Mon, 25 Jul 2022 23:27:19 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     David Matlack <dmatlack@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yosry Ahmed <yosryahmed@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH v2 4/6] KVM: x86/mmu: Track the number of TDP MMU pages,
 but not the actual pages

On Mon, Jul 25, 2022, David Matlack wrote:
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index 246b69262b93..5c269b2556d6 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1271,6 +1271,9 @@ struct kvm_arch {
> >  	 */
> >  	bool tdp_mmu_enabled;
> >  
> > +	/* The number of TDP MMU pages across all roots. */
> > +	atomic64_t tdp_mmu_pages;
> 
> This is the number of non-root TDP MMU pages, right?

Yes.