From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DDBEFC05027 for ; Fri, 17 Feb 2023 04:23:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=HNHjkY3lyTPeBuGZf6peGNVhp+U3gg039a0ji+MN8eE=; b=ZErG2NWXbc5yJ0 Jp7vmjzBVLOJiInwqNj5xdkHEhV9HwpyRjEPjUOphYJ3j9jGre+Kuon978mtp92qFJb3/pw/HGFFz MahhOjXwelAW34cHDd8dRBXJ2L59MioPHGtyFHDK9dwGodUbATBsvI7YxeFY0bVekMmgliHm02viB c3pAzXFKu6HDQletU0HZLMA6kZzcDW9HFtoieREgXj7Zbc8d9ywUexj6jMLnysRf09cclQM1pyZNg oIj/mEfLjODoKrCLacsvYLcme8jvUzZGxxYUDVlt1WK5wjupmNKK9gXjtKE8pQJFx9K40WmlbaHYN RsW+Foaq+NsD/SLrStEg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pSsGA-00CeCj-S0; Fri, 17 Feb 2023 04:22:11 +0000 Received: from mail-vs1-xe2d.google.com ([2607:f8b0:4864:20::e2d]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pSsG7-00Ce9d-MH for linux-arm-kernel@lists.infradead.org; Fri, 17 Feb 2023 04:22:09 +0000 Received: by mail-vs1-xe2d.google.com with SMTP id p14so4391389vsn.0 for ; Thu, 16 Feb 2023 20:22:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=DmQBbpAu6B0uYYhxH30aHdK9UMmXNgVHX14jvNOggZk=; b=tJA35Ofvs7OhFLQM4OAO9pyzBvthd1pHbKdaGQcRJ3YavWvQaShc7aTkBnKhHNN/qf 71V0DM19hvtEjOHUzjLR2745KsM8dlyMKcd01CcQ+FwFzC7/bE1MPLr0cth7zPVN5t84 xXJakn3yMkVRExor1tx6+hTzGcDc9X7aMCvaIxvranghfxdnSmz++u5JcY376v30Pvve cbEsgeTf3k8MLOzEzpPng3PoJj+Ma95D9fTXhjgzq7h+2JupaecZZY1EoqYZmXBd2Gl2 pokR2z1r2mqfRnRHTWASeUWMVLlt4NHNRc3gZ0KfBJzISW6RhMZlmTLJmVp6kSJ54cKK 2BCQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=DmQBbpAu6B0uYYhxH30aHdK9UMmXNgVHX14jvNOggZk=; b=hJCiMrYYTz0m7hyVZ9qWvsf5QR9UIfS8si3H85GWrACcSWw/gm+SinUTOmq7On5kZU dovjZju0/8rAvPVVjfz4HxPZQUXdtC4FXCBFRTqS0dwhW7Y8xFju3WmmEwuqmB+RHZXl WGWD1jrkzLYqebDM9w/tVWONhrKpcMRkwPhegttExkr4UFXZH/6IxIojJfGub6M+SIhB EC5P71YdzCHTb4TZ4HuyE/8gnGANMeiJ+GG8Scc9ERfqu2VPBrh1m9hakTLE9Ow5uBzz Fvds2F7GCxIFvq9Nybfi/M4aRBD2zPo3ZGeaOwijgMeNIfuMiaFlmxe3tNCQEuYbjX3o 468w== X-Gm-Message-State: AO0yUKXGxHempAIq5dYg8DsSMRP8bWE5pBDZi3R+khiReDzQGxyMR4tc ieOMQvDs5pKGZdkAv3Y6nauRUhWOQubcOenJA9Audg== X-Google-Smtp-Source: AK7set8pOdWfIt69LFD7Klja37MX4Y0B4AgeZGxYGFzE3TmHzaA3GYFi17QwE/R0IT0jJksQbazWrQ2EJ3TyMlpGcMk= X-Received: by 2002:a67:cf47:0:b0:411:c1a0:c787 with SMTP id f7-20020a67cf47000000b00411c1a0c787mr1602974vsm.26.1676607724287; Thu, 16 Feb 2023 20:22:04 -0800 (PST) MIME-Version: 1.0 References: <20230217041230.2417228-1-yuzhao@google.com> <20230217041230.2417228-4-yuzhao@google.com> In-Reply-To: <20230217041230.2417228-4-yuzhao@google.com> From: Yu Zhao Date: Thu, 16 Feb 2023 21:21:28 -0700 Message-ID: Subject: Re: [PATCH mm-unstable v1 3/5] kvm/arm64: add kvm_arch_test_clear_young() To: Marc Zyngier , Will Deacon Cc: Jonathan Corbet , Michael Larabel , 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 , Paolo Bonzini X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230216_202207_763088_9245F0E0 X-CRM114-Status: GOOD ( 15.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Feb 16, 2023 at 9:12 PM Yu Zhao wrote: > > This patch adds kvm_arch_test_clear_young() for the vast majority of > VMs that are not pKVM and run on hardware that sets the accessed bit > in KVM page tables. > > 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 > --- > arch/arm64/include/asm/kvm_host.h | 7 +++ > arch/arm64/include/asm/kvm_pgtable.h | 8 +++ > arch/arm64/include/asm/stage2_pgtable.h | 43 ++++++++++++++ > arch/arm64/kvm/arm.c | 1 + > arch/arm64/kvm/hyp/pgtable.c | 51 ++-------------- > arch/arm64/kvm/mmu.c | 77 ++++++++++++++++++++++++- > 6 files changed, 141 insertions(+), 46 deletions(-) Adding Marc and Will. Can you please add other interested parties that I've missed? Thanks. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel