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 X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0630C10F11 for ; Wed, 10 Apr 2019 14:56:49 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 6F02C20693 for ; Wed, 10 Apr 2019 14:56:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="aS+iw24r" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6F02C20693 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:To:Subject:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QHrBfzmkg0bKC2FeoGtn4bz2kUfzaNxyQ+DK9uB1EgU=; b=aS+iw24ruHRCrK a9BbophYW2DKmsAVtr6l0Y856sLQrw2/6YgwaNRCnHGuqs35edtZLoTeRRA3nKDhWhT8UkgtfbD/P /fviue0vUgvmntBmMWRg3tZnEa6xtDWSv/hhAwaM8WMZePgbykdTd2a6Gz+lwE70A8Ux7N/gY3y0F fkUaGvIBoU3QOkaT8CevS+j9DFlT/VgROf9Jb9sHttwJE4m74ROcuCHpBzXxM0FIU3SfS5fd9e6M9 04ljJNCwGAKwSnKFk4a0AUFkIEiSJw+p/yIQaIM6TpF5zC+cOrUeT5aQ1goAcUx2ewIJz+9IrL6ob wrm594c5u9m01y5oWKrg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hEEee-0008Ee-C8; Wed, 10 Apr 2019 14:56:48 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hEEea-0008Dq-Fq for linux-arm-kernel@lists.infradead.org; Wed, 10 Apr 2019 14:56:46 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6FA2D374; Wed, 10 Apr 2019 07:56:43 -0700 (PDT) Received: from [10.1.196.69] (e112269-lin.cambridge.arm.com [10.1.196.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id F11813F557; Wed, 10 Apr 2019 07:56:39 -0700 (PDT) Subject: Re: [PATCH v8 00/20] Convert x86 & arm64 to use generic page walk To: linux-mm@kvack.org References: <20190403141627.11664-1-steven.price@arm.com> From: Steven Price Message-ID: <4e804c87-1788-8903-ccc9-55953aa6da36@arm.com> Date: Wed, 10 Apr 2019 15:56:38 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <20190403141627.11664-1-steven.price@arm.com> Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190410_075644_538746_F0285B32 X-CRM114-Status: GOOD ( 26.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Dave Hansen , Arnd Bergmann , Ard Biesheuvel , Peter Zijlstra , Catalin Marinas , x86@kernel.org, Will Deacon , linux-kernel@vger.kernel.org, =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Ingo Molnar , Borislav Petkov , Andy Lutomirski , "H. Peter Anvin" , James Morse , Thomas Gleixner , Andrew Morton , linux-arm-kernel@lists.infradead.org, "Liang, Kan" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi all, Gentle ping: who can take this? Is there anything blocking this series? Thanks, Steve On 03/04/2019 15:16, Steven Price wrote: > Most architectures current have a debugfs file for dumping the kernel > page tables. Currently each architecture has to implement custom > functions for walking the page tables because the generic > walk_page_range() function is unable to walk the page tables used by the > kernel. > > This series extends the capabilities of walk_page_range() so that it can > deal with the page tables of the kernel (which have no VMAs and can > contain larger huge pages than exist for user space). x86 and arm64 are > then converted to make use of walk_page_range() removing the custom page > table walkers. > > To enable a generic page table walker to walk the unusual mappings of > the kernel we need to implement a set of functions which let us know > when the walker has reached the leaf entry. Since arm, powerpc, s390, > sparc and x86 all have p?d_large macros lets standardise on that and > implement those that are missing. > > Potentially future changes could unify the implementations of the > debugfs walkers further, moving the common functionality into common > code. This would require a common way of handling the effective > permissions (currently implemented only for x86) along with a per-arch > way of formatting the page table information for debugfs. One > immediate benefit would be getting the KASAN speed up optimisation in > arm64 (and other arches) which is currently only implemented for x86. > > Also available as a git tree: > git://linux-arm.org/linux-sp.git walk_page_range/v8 > > Changes since v7: > https://lore.kernel.org/lkml/20190328152104.23106-1-steven.price@arm.com/T/ > * Updated commit message in patch 2 to clarify that we rely on the page > tables being walked to be the same page size/depth as the kernel's > (since this confused me earlier today). > > Changes since v6: > https://lore.kernel.org/lkml/20190326162624.20736-1-steven.price@arm.com/T/ > * Split the changes for powerpc. pmd_large() is now added in patch 4 > patch, and pmd_is_leaf() removed in patch 5. > > Changes since v5: > https://lore.kernel.org/lkml/20190321141953.31960-1-steven.price@arm.com/T/ > * Updated comment for struct mm_walk based on Mike Rapoport's > suggestion > > Changes since v4: > https://lore.kernel.org/lkml/20190306155031.4291-1-steven.price@arm.com/T/ > * Correctly force result to a boolean in p?d_large for powerpc. > * Added Acked-bys > * Rebased onto v5.1-rc1 > > Changes since v3: > https://lore.kernel.org/lkml/20190227170608.27963-1-steven.price@arm.com/T/ > * Restored the generic macros, only implement p?d_large() for > architectures that have support for large pages. This also means > adding dummy #defines for architectures that define p?d_large as > static inline to avoid picking up the generic macro. > * Drop the 'depth' argument from pte_hole > * Because we no longer have the depth for holes, we also drop support > in x86 for showing missing pages in debugfs. See discussion below: > https://lore.kernel.org/lkml/26df02dd-c54e-ea91-bdd1-0a4aad3a30ac@arm.com/ > * mips: only define p?d_large when _PAGE_HUGE is defined. > > Changes since v2: > https://lore.kernel.org/lkml/20190221113502.54153-1-steven.price@arm.com/T/ > * Rather than attemping to provide generic macros, actually implement > p?d_large() for each architecture. > > Changes since v1: > https://lore.kernel.org/lkml/20190215170235.23360-1-steven.price@arm.com/T/ > * Added p4d_large() macro > * Comments to explain p?d_large() macro semantics > * Expanded comment for pte_hole() callback to explain mapping between > depth and P?D > * Handle folded page tables at all levels, so depth from pte_hole() > ignores folding at any level (see real_depth() function in > mm/pagewalk.c) > > Steven Price (20): > arc: mm: Add p?d_large() definitions > arm64: mm: Add p?d_large() definitions > mips: mm: Add p?d_large() definitions > powerpc: mm: Add p?d_large() definitions > KVM: PPC: Book3S HV: Remove pmd_is_leaf() > riscv: mm: Add p?d_large() definitions > s390: mm: Add p?d_large() definitions > sparc: mm: Add p?d_large() definitions > x86: mm: Add p?d_large() definitions > mm: Add generic p?d_large() macros > mm: pagewalk: Add p4d_entry() and pgd_entry() > mm: pagewalk: Allow walking without vma > mm: pagewalk: Add test_p?d callbacks > arm64: mm: Convert mm/dump.c to use walk_page_range() > x86: mm: Don't display pages which aren't present in debugfs > x86: mm: Point to struct seq_file from struct pg_state > x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct > x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct > x86: mm: Convert ptdump_walk_pgd_level_core() to take an mm_struct > x86: mm: Convert dump_pagetables to use walk_page_range > > arch/arc/include/asm/pgtable.h | 1 + > arch/arm64/include/asm/pgtable.h | 2 + > arch/arm64/mm/dump.c | 117 +++---- > arch/mips/include/asm/pgtable-64.h | 8 + > arch/powerpc/include/asm/book3s/64/pgtable.h | 30 +- > arch/powerpc/kvm/book3s_64_mmu_radix.c | 12 +- > arch/riscv/include/asm/pgtable-64.h | 7 + > arch/riscv/include/asm/pgtable.h | 7 + > arch/s390/include/asm/pgtable.h | 2 + > arch/sparc/include/asm/pgtable_64.h | 2 + > arch/x86/include/asm/pgtable.h | 10 +- > arch/x86/mm/debug_pagetables.c | 8 +- > arch/x86/mm/dump_pagetables.c | 347 ++++++++++--------- > arch/x86/platform/efi/efi_32.c | 2 +- > arch/x86/platform/efi/efi_64.c | 4 +- > include/asm-generic/pgtable.h | 19 + > include/linux/mm.h | 26 +- > mm/pagewalk.c | 76 +++- > 18 files changed, 407 insertions(+), 273 deletions(-) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel