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From: Yu Zhao <yuzhao@google.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	 Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Jonathan Corbet <corbet@lwn.net>,
	Michael Larabel <michael@michaellarabel.com>,
	kvmarm@lists.linux.dev,  kvm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	 linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	 linuxppc-dev@lists.ozlabs.org, x86@kernel.org,
	linux-mm@google.com,  Andrew Morton <akpm@linux-foundation.org>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH mm-unstable v1 4/5] kvm/powerpc: add kvm_arch_test_clear_young()
Date: Thu, 16 Feb 2023 21:24:09 -0700	[thread overview]
Message-ID: <CAOUHufbjbaBtNQX-uSOUQEDoH9nAE0nC7L+ssoPF3WHpQuiwuw@mail.gmail.com> (raw)
In-Reply-To: <20230217041230.2417228-5-yuzhao@google.com>

On Thu, Feb 16, 2023 at 9:12 PM Yu Zhao <yuzhao@google.com> wrote:
>
> This patch adds kvm_arch_test_clear_young() for the vast majority of
> VMs that are not nested and run on hardware with Radix MMU enabled.
>
> It relies on two techniques, RCU and cmpxchg, to safely test and clear
> the accessed bit without taking the MMU lock. The former protects KVM
> page tables from being freed while the latter clears the accessed bit
> atomically against both the hardware and other software page table
> walkers.
>
> Signed-off-by: Yu Zhao <yuzhao@google.com>
> ---
>  arch/powerpc/include/asm/kvm_host.h    | 18 ++++++
>  arch/powerpc/include/asm/kvm_ppc.h     | 14 +----
>  arch/powerpc/kvm/book3s.c              |  7 +++
>  arch/powerpc/kvm/book3s.h              |  2 +
>  arch/powerpc/kvm/book3s_64_mmu_radix.c | 78 +++++++++++++++++++++++++-
>  arch/powerpc/kvm/book3s_hv.c           | 10 ++--
>  6 files changed, 110 insertions(+), 19 deletions(-)

Adding Michael, Nicholas and Christophe.

I'm not sure who I should add for this patch. Can you please add any
interested parties that I've missed?

Thank you.


  reply	other threads:[~2023-02-17  4:24 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-17  4:12 [PATCH mm-unstable v1 0/5] mm/kvm: lockless accessed bit harvest Yu Zhao
2023-02-17  4:12 ` [PATCH mm-unstable v1 1/5] mm/kvm: add mmu_notifier_test_clear_young() Yu Zhao
2023-02-23 17:13   ` Sean Christopherson
2023-02-23 17:40     ` Yu Zhao
2023-02-23 21:12       ` Sean Christopherson
2023-02-23 17:34   ` Sean Christopherson
2023-02-17  4:12 ` [PATCH mm-unstable v1 2/5] kvm/x86: add kvm_arch_test_clear_young() Yu Zhao
2023-02-17  4:19   ` Yu Zhao
2023-02-17 16:27   ` Sean Christopherson
2023-02-23  5:58     ` Yu Zhao
2023-02-23 17:09       ` Sean Christopherson
2023-02-23 17:27         ` Yu Zhao
2023-02-23 18:23           ` Sean Christopherson
2023-02-23 18:34             ` Yu Zhao
2023-02-23 18:47               ` Sean Christopherson
2023-02-23 19:02                 ` Yu Zhao
2023-02-23 19:21                   ` Sean Christopherson
2023-02-23 19:25                     ` Yu Zhao
2023-02-17  4:12 ` [PATCH mm-unstable v1 3/5] kvm/arm64: " Yu Zhao
2023-02-17  4:21   ` Yu Zhao
2023-02-17  9:00     ` Marc Zyngier
2023-02-23  3:58       ` Yu Zhao
2023-02-23  9:03         ` Marc Zyngier
2023-02-23  9:18           ` Yu Zhao
2023-02-17  9:09   ` Oliver Upton
2023-02-17 16:00     ` Sean Christopherson
2023-02-23  5:25       ` Yu Zhao
2023-02-23  4:43     ` Yu Zhao
2023-02-17  4:12 ` [PATCH mm-unstable v1 4/5] kvm/powerpc: " Yu Zhao
2023-02-17  4:24   ` Yu Zhao [this message]
2023-02-17  4:12 ` [PATCH mm-unstable v1 5/5] mm: multi-gen LRU: use mmu_notifier_test_clear_young() Yu Zhao
2023-02-23 17:43   ` Sean Christopherson
2023-02-23 18:08     ` Yu Zhao
2023-02-23 19:11       ` Sean Christopherson
2023-02-23 19:36         ` Yu Zhao
2023-02-23 19:58           ` Sean Christopherson
2023-02-23 20:09             ` Yu Zhao
2023-02-23 20:28               ` Sean Christopherson
2023-02-23 20:48                 ` Yu Zhao

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