linux-kernel - Re: [PATCH v8 05/11] KVM: x86/mmu: Rearrange kvm_{test_,}age

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Message-ID: <CAOUHufaKCN0SWk-QVmLG18m-3HH73Z4i-cogDxuXYsS_Tcva6Q@mail.gmail.com>
Date: Tue, 5 Nov 2024 11:46:25 -0700
From: Yu Zhao <yuzhao@...gle.com>
To: James Houghton <jthoughton@...gle.com>
Cc: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	David Matlack <dmatlack@...gle.com>, David Rientjes <rientjes@...gle.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Wei Xu <weixugc@...gle.com>, 
	Axel Rasmussen <axelrasmussen@...gle.com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 05/11] KVM: x86/mmu: Rearrange kvm_{test_,}age_gfn

On Tue, Nov 5, 2024 at 11:43 AM James Houghton <jthoughton@...gle.com> wrote:
>
> Reorder the TDP MMU check to be first for both kvm_test_age_gfn and
> kvm_age_gfn. For kvm_test_age_gfn, this allows us to completely avoid
> needing to grab the MMU lock when the TDP MMU reports that the page is
> young. Do the same for kvm_age_gfn merely for consistency.
>
> Signed-off-by: James Houghton <jthoughton@...gle.com>

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