linux-kernel - Re: [PATCH v6 03/11] KVM: arm64: Relax locking for kvm_test_age_gfn and kvm_age

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Message-ID: <ZtEW5Iym5QsJbONM@linux.dev>
Date: Thu, 29 Aug 2024 17:48:36 -0700
From: Oliver Upton <oliver.upton@...ux.dev>
To: James Houghton <jthoughton@...gle.com>
Cc: Yu Zhao <yuzhao@...gle.com>, Sean Christopherson <seanjc@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Ankit Agrawal <ankita@...dia.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	David Matlack <dmatlack@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	James Morse <james.morse@....com>, Jason Gunthorpe <jgg@...pe.ca>,
	Jonathan Corbet <corbet@....net>, Marc Zyngier <maz@...nel.org>,
	Raghavendra Rao Ananta <rananta@...gle.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Shaoqin Huang <shahuang@...hat.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Wei Xu <weixugc@...gle.com>, Will Deacon <will@...nel.org>,
	Zenghui Yu <yuzenghui@...wei.com>, kvmarm@...ts.linux.dev,
	kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v6 03/11] KVM: arm64: Relax locking for kvm_test_age_gfn
 and kvm_age_gfn

On Thu, Aug 29, 2024 at 05:33:00PM -0700, James Houghton wrote:
> On Mon, Aug 19, 2024 at 1:42 PM Oliver Upton <oliver.upton@...ux.dev> wrote:
> > Asking since you had a setup / data earlier on when you were carrying
> > the series. Hopefully with supportive data we can get arm64 to opt-in
> > to HAVE_KVM_MMU_NOTIFIER_YOUNG_FAST_ONLY as well.
> 
> I'll keep trying some other approaches I can take for getting similar
> testing that Yu had; it is somewhat difficult for me to reproduce
> those tests (and it really shouldn't be.... sorry).

No need to apologize. Getting good test hardware for arm64 is a complete
chore. Sure would love a functional workstation with cores from this
decade...

> I think it makes most sense for me to drop the arm64 patch for now and
> re-propose it (or something stronger) alongside enabling aging. Does
> that sound ok?

I'm a bit disappointed that we haven't gotten forward progress on the
arm64 patches, but I also recognize this is the direction of travel as
the x86 patches are shaping up.

So yeah, I'm OK with it, but I'd love to get the arm64 side sorted out
soon while the context is still fresh.

-- 
Thanks,
Oliver