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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 83BA3C52D7C for ; Wed, 21 Aug 2024 11:29:04 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Wpkcb0nP6z2yQn; Wed, 21 Aug 2024 21:29:03 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=Huawei.com Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=185.176.79.56 Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=huawei.com (client-ip=185.176.79.56; helo=frasgout.his.huawei.com; envelope-from=jonathan.cameron@huawei.com; receiver=lists.ozlabs.org) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4WpkcY2w3Pz2yPj for ; Wed, 21 Aug 2024 21:28:56 +1000 (AEST) Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4WpkXm5yH7z6D9Bh; Wed, 21 Aug 2024 19:25:44 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id A576D140B18; Wed, 21 Aug 2024 19:28:50 +0800 (CST) Received: from localhost (10.203.177.66) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Wed, 21 Aug 2024 12:28:49 +0100 Date: Wed, 21 Aug 2024 12:28:48 +0100 From: Jonathan Cameron To: Tong Tiangen CC: Mark Rutland , Catalin Marinas , Will Deacon , Andrew Morton , James Morse , "Robin Murphy" , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Michael Ellerman , Nicholas Piggin , Andrey Ryabinin , Alexander Potapenko , Christophe Leroy , Aneesh Kumar K.V , "Naveen N. Rao" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , , "H. Peter Anvin" , , , , , , Guohanjun Subject: Re: [PATCH v12 4/6] arm64: support copy_mc_[user]_highpage() Message-ID: <20240821122848.00004047@Huawei.com> In-Reply-To: <8257d76b-c700-89a6-0e29-f194d2e1cd61@huawei.com> References: <20240528085915.1955987-1-tongtiangen@huawei.com> <20240528085915.1955987-5-tongtiangen@huawei.com> <20240819125601.0000687b@Huawei.com> <8257d76b-c700-89a6-0e29-f194d2e1cd61@huawei.com> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.203.177.66] X-ClientProxiedBy: lhrpeml500005.china.huawei.com (7.191.163.240) To lhrpeml500005.china.huawei.com (7.191.163.240) On Tue, 20 Aug 2024 11:02:05 +0800 Tong Tiangen wrote: > =E5=9C=A8 2024/8/19 19:56, Jonathan Cameron =E5=86=99=E9=81=93: > > On Tue, 28 May 2024 16:59:13 +0800 > > Tong Tiangen wrote: > > =20 > >> Currently, many scenarios that can tolerate memory errors when copying= page > >> have been supported in the kernel[1~5], all of which are implemented by > >> copy_mc_[user]_highpage(). arm64 should also support this mechanism. > >> > >> Due to mte, arm64 needs to have its own copy_mc_[user]_highpage() > >> architecture implementation, macros __HAVE_ARCH_COPY_MC_HIGHPAGE and > >> __HAVE_ARCH_COPY_MC_USER_HIGHPAGE have been added to control it. > >> > >> Add new helper copy_mc_page() which provide a page copy implementation= with > >> hardware memory error safe. The code logic of copy_mc_page() is the sa= me as > >> copy_page(), the main difference is that the ldp insn of copy_mc_page() > >> contains the fixup type EX_TYPE_KACCESS_ERR_ZERO_ME_SAFE, therefore, t= he > >> main logic is extracted to copy_page_template.S. > >> > >> [1] commit d302c2398ba2 ("mm, hwpoison: when copy-on-write hits poison= , take page offline") > >> [2] commit 1cb9dc4b475c ("mm: hwpoison: support recovery from HugePage= copy-on-write faults") > >> [3] commit 6b970599e807 ("mm: hwpoison: support recovery from ksm_migh= t_need_to_copy()") > >> [4] commit 98c76c9f1ef7 ("mm/khugepaged: recover from poisoned anonymo= us memory") > >> [5] commit 12904d953364 ("mm/khugepaged: recover from poisoned file-ba= cked memory") > >> > >> Signed-off-by: Tong Tiangen =20 > > Trivial stuff inline. > >=20 > > Jonathan =20 >=20 > I'm sorry, I may not have understood what you meant. Where is the better > place to do inline? :) Oops. All I meant was: My comments are inline - as in within the patch later in the email.