From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0D8F123D0 for ; Thu, 16 Nov 2023 11:13:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0AD061595; Thu, 16 Nov 2023 03:14:05 -0800 (PST) Received: from [10.1.35.163] (XHFQ2J9959.cambridge.arm.com [10.1.35.163]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D20143F6C4; Thu, 16 Nov 2023 03:13:15 -0800 (PST) Message-ID: <75e721cb-18c2-4717-bdbe-af346b1deafa@arm.com> Date: Thu, 16 Nov 2023 11:13:14 +0000 Precedence: bulk X-Mailing-List: oe-kbuild-all@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 01/14] mm: Batch-copy PTE ranges during fork() Content-Language: en-GB To: David Hildenbrand , kernel test robot , Catalin Marinas , Will Deacon , Ard Biesheuvel , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Andrew Morton , Anshuman Khandual , Matthew Wilcox , Yu Zhao , Mark Rutland , Kefeng Wang , John Hubbard , Zi Yan Cc: oe-kbuild-all@lists.linux.dev, Linux Memory Management List , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20231115163018.1303287-2-ryan.roberts@arm.com> <202311160516.kHhfmjvl-lkp@intel.com> <4e8d329c-eda6-4ff8-bb56-8924bb4583b2@redhat.com> <930b5f6a-27d9-43da-bf9f-1478c8de1af8@redhat.com> From: Ryan Roberts In-Reply-To: <930b5f6a-27d9-43da-bf9f-1478c8de1af8@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 16/11/2023 11:01, David Hildenbrand wrote: > On 16.11.23 11:36, Ryan Roberts wrote: >> On 16/11/2023 10:12, David Hildenbrand wrote: >>> On 16.11.23 11:07, Ryan Roberts wrote: >>>> Hi All, >>>> >>>> Hoping for some guidance below! >>>> >>>> >>>> On 15/11/2023 21:26, kernel test robot wrote: >>>>> Hi Ryan, >>>>> >>>>> kernel test robot noticed the following build errors: >>>>> >>>>> [auto build test ERROR on akpm-mm/mm-everything] >>>>> [also build test ERROR on linus/master v6.7-rc1 next-20231115] >>>>> [cannot apply to arm64/for-next/core efi/next] >>>>> [If your patch is applied to the wrong git tree, kindly drop us a note. >>>>> And when submitting patch, we suggest to use '--base' as documented in >>>>> https://git-scm.com/docs/git-format-patch#_base_tree_information] >>>>> >>>>> url: >>>>> https://github.com/intel-lab-lkp/linux/commits/Ryan-Roberts/mm-Batch-copy-PTE-ranges-during-fork/20231116-010123 >>>>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git >>>>> mm-everything >>>>> patch link: >>>>> https://lore.kernel.org/r/20231115163018.1303287-2-ryan.roberts%40arm.com >>>>> patch subject: [PATCH v2 01/14] mm: Batch-copy PTE ranges during fork() >>>>> config: arm-randconfig-002-20231116 >>>>> (https://download.01.org/0day-ci/archive/20231116/202311160516.kHhfmjvl-lkp@intel.com/config) >>>>> compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0 >>>>> reproduce (this is a W=1 build): >>>>> (https://download.01.org/0day-ci/archive/20231116/202311160516.kHhfmjvl-lkp@intel.com/reproduce) >>>>> >>>>> If you fix the issue in a separate patch/commit (i.e. not just a new >>>>> version of >>>>> the same patch/commit), kindly add following tags >>>>> | Reported-by: kernel test robot >>>>> | Closes: >>>>> https://lore.kernel.org/oe-kbuild-all/202311160516.kHhfmjvl-lkp@intel.com/ >>>>> >>>>> All errors (new ones prefixed by >>): >>>>> >>>>>      mm/memory.c: In function 'folio_nr_pages_cont_mapped': >>>>>>> mm/memory.c:969:16: error: implicit declaration of function 'pte_pgprot'; >>>>>>> did you mean 'ptep_get'? [-Werror=implicit-function-declaration] >>>>>        969 |         prot = pte_pgprot(pte_mkold(pte_mkclean(ptent))); >>>>>            |                ^~~~~~~~~~ >>>>>            |                ptep_get >>>>>      cc1: some warnings being treated as errors >>>> >>>> It turns out that pte_pgprot() is not universal; its only implemented by >>>> architectures that select CONFIG_HAVE_IOREMAP_PROT (currently arc, arm64, >>>> loongarch, mips, powerpc, s390, sh, x86). >>>> >>>> I'm using it in core-mm to help calculate the number of "contiguously mapped" >>>> pages within a folio (note that's not the same as arm64's notion of >>>> contpte-mapped. I just want to know that there are N physically contiguous >>>> pages >>>> mapped virtually contiguously with the same permissions). And I'm using >>>> pte_pgprot() to extract the permissions for each pte to compare. It's important >>>> that we compare the permissions because just because the pages belongs to the >>>> same folio doesn't imply they are mapped with the same permissions; think >>>> mprotect()ing a sub-range. >>>> >>>> I don't have a great idea for how to fix this - does anyone have any thoughts? >>> >>> KIS :) fork() operates on individual VMAs if I am not daydreaming. >>> >>> Just check for the obvious pte_write()/dirty/ and you'll be fine. >> >> Yes, that seems much simpler! I think we might have to be careful about the uffd >> wp bit too? I think that's it - are there any other exotic bits that might need >> to be considered? > > Good question. Mimicing what the current code already does should be sufficient. > uffd-wp should have the PTE R/O. You can set the contpte bit independent of any > SW bit (uffd-wp, softdirty, ...) I guess, no need to worry about that. > OK thanks. I'll rework for this approach in v3. 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 2EE2BC197A0 for ; Thu, 16 Nov 2023 11:13:55 +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:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Pr2esE25tUqzNhxob5ZFvAkzTgHkOxDP4BHA4pNoIdA=; b=ZMg1xz+FawM9Fm 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usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D20143F6C4; Thu, 16 Nov 2023 03:13:15 -0800 (PST) Message-ID: <75e721cb-18c2-4717-bdbe-af346b1deafa@arm.com> Date: Thu, 16 Nov 2023 11:13:14 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 01/14] mm: Batch-copy PTE ranges during fork() Content-Language: en-GB To: David Hildenbrand , kernel test robot , Catalin Marinas , Will Deacon , Ard Biesheuvel , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Andrew Morton , Anshuman Khandual , Matthew Wilcox , Yu Zhao , Mark Rutland , Kefeng Wang , John Hubbard , Zi Yan Cc: oe-kbuild-all@lists.linux.dev, Linux Memory Management List , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20231115163018.1303287-2-ryan.roberts@arm.com> <202311160516.kHhfmjvl-lkp@intel.com> <4e8d329c-eda6-4ff8-bb56-8924bb4583b2@redhat.com> <930b5f6a-27d9-43da-bf9f-1478c8de1af8@redhat.com> From: Ryan Roberts In-Reply-To: <930b5f6a-27d9-43da-bf9f-1478c8de1af8@redhat.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231116_031323_309068_D06BF4BB X-CRM114-Status: GOOD ( 19.55 ) 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="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMTYvMTEvMjAyMyAxMTowMSwgRGF2aWQgSGlsZGVuYnJhbmQgd3JvdGU6Cj4gT24gMTYuMTEu MjMgMTE6MzYsIFJ5YW4gUm9iZXJ0cyB3cm90ZToKPj4gT24gMTYvMTEvMjAyMyAxMDoxMiwgRGF2 aWQgSGlsZGVuYnJhbmQgd3JvdGU6Cj4+PiBPbiAxNi4xMS4yMyAxMTowNywgUnlhbiBSb2JlcnRz 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