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=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 E6A88ECE58C for ; Mon, 7 Oct 2019 15:38:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BB53320640 for ; Mon, 7 Oct 2019 15:38:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728250AbfJGPim (ORCPT ); Mon, 7 Oct 2019 11:38:42 -0400 Received: from foss.arm.com ([217.140.110.172]:38190 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727745AbfJGPim (ORCPT ); Mon, 7 Oct 2019 11:38:42 -0400 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 54128142F; Mon, 7 Oct 2019 08:38:41 -0700 (PDT) Received: from e112269-lin.arm.com (unknown [10.1.197.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BCBE13F6C4; Mon, 7 Oct 2019 08:38:38 -0700 (PDT) From: Steven Price To: linux-mm@kvack.org Cc: Steven Price , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Dave Hansen , Ingo Molnar , James Morse , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Peter Zijlstra , Thomas Gleixner , Will Deacon , x86@kernel.org, "H. Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , "Liang, Kan" , Andrew Morton Subject: [PATCH v11 00/22] Generic page walk and ptdump Date: Mon, 7 Oct 2019 16:38:00 +0100 Message-Id: <20191007153822.16518-1-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Resurrecting this patch set after rebasing onto v5.4-rc1 which includes the change to separate function pointers from iterator data in the mm_walk structure. Many architectures current have a debugfs file for dumping the kernel page tables. Currently each architecture has to implement custom functions for this because the details of walking the page tables used by the kernel are different between architectures. 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). A generic PTDUMP implementation is the implemented making use of the new functionality of walk_page_range() and finally arm64 and x86 are switch to using it, removing the custom 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. After a suggestion from Will Deacon I've chosen the name p?d_leaf() as this (hopefully) describes the purpose (and is a new name so has no historic baggage). Some architectures have p?d_large macros but this is easily confused with "large pages". This series ends with a generic PTDUMP implemention for arm64 and x86. Mostly this is a clean up and there should be very little functional change. The exceptions are: * x86 PTDUMP debugfs output no longer display pages which aren't present (patch 14). * arm64 has the ability to efficiently process KASAN pages (which previously only x86 implemented). This means that the combination of KASAN and DEBUG_WX is now useable. Also available as a git tree: git://linux-arm.org/linux-sp.git walk_page_range/v11 Changes since v10: https://lore.kernel.org/lkml/20190731154603.41797-1-steven.price@arm.com/ * Rebased to v5.4-rc1 - mainly various updates to deal with the splitting out of ops from struct mm_walk. * Deal with PGD_LEVEL_MULT not always being constant on x86. Changes since v9: https://lore.kernel.org/lkml/20190722154210.42799-1-steven.price@arm.com/ * Moved generic macros to first page in the series and explained the macro naming in the commit message. * mips: Moved macros to pgtable.h as they are now valid for both 32 and 64 bit * x86: Dropped patch which changed the debugfs output for x86, instead we have... * new patch adding 'depth' parameter to pte_hole. This is used to provide the necessary information to output lines for 'holes' in the debugfs files * new patch changing arm64 debugfs output to include holes to match x86 * generic ptdump KASAN handling has been simplified and now works with CONFIG_DEBUG_VIRTUAL. Changes since v8: https://lore.kernel.org/lkml/20190403141627.11664-1-steven.price@arm.com/ * Rename from p?d_large() to p?d_leaf() * Dropped patches migrating arm64/x86 custom walkers to walk_page_range() in favour of adding a generic PTDUMP implementation and migrating arm64/x86 to that instead. * Rebased to v5.3-rc1 Steven Price (22): mm: Add generic p?d_leaf() macros arc: mm: Add p?d_leaf() definitions arm: mm: Add p?d_leaf() definitions arm64: mm: Add p?d_leaf() definitions mips: mm: Add p?d_leaf() definitions powerpc: mm: Add p?d_leaf() definitions riscv: mm: Add p?d_leaf() definitions s390: mm: Add p?d_leaf() definitions sparc: mm: Add p?d_leaf() definitions x86: mm: Add p?d_leaf() definitions mm: pagewalk: Add p4d_entry() and pgd_entry() mm: pagewalk: Allow walking without vma mm: pagewalk: Add test_p?d callbacks mm: pagewalk: Add 'depth' parameter to pte_hole 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 mm: Add generic ptdump x86: mm: Convert dump_pagetables to use walk_page_range arm64: mm: Convert mm/dump.c to use walk_page_range() arm64: mm: Display non-present entries in ptdump arch/arc/include/asm/pgtable.h | 1 + arch/arm/include/asm/pgtable-2level.h | 1 + arch/arm/include/asm/pgtable-3level.h | 1 + arch/arm64/Kconfig | 1 + arch/arm64/Kconfig.debug | 19 +- arch/arm64/include/asm/pgtable.h | 2 + arch/arm64/include/asm/ptdump.h | 8 +- arch/arm64/mm/Makefile | 4 +- arch/arm64/mm/dump.c | 142 +++----- arch/arm64/mm/mmu.c | 4 +- arch/arm64/mm/ptdump_debugfs.c | 2 +- arch/mips/include/asm/pgtable.h | 5 + arch/powerpc/include/asm/book3s/64/pgtable.h | 30 +- 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/Kconfig | 1 + arch/x86/Kconfig.debug | 20 +- arch/x86/include/asm/pgtable.h | 10 +- arch/x86/mm/Makefile | 4 +- arch/x86/mm/debug_pagetables.c | 8 +- arch/x86/mm/dump_pagetables.c | 332 +++++-------------- arch/x86/platform/efi/efi_32.c | 2 +- arch/x86/platform/efi/efi_64.c | 4 +- drivers/firmware/efi/arm-runtime.c | 2 +- fs/proc/task_mmu.c | 4 +- include/asm-generic/pgtable.h | 20 ++ include/linux/pagewalk.h | 37 ++- include/linux/ptdump.h | 21 ++ mm/Kconfig.debug | 21 ++ mm/Makefile | 1 + mm/hmm.c | 8 +- mm/migrate.c | 5 +- mm/mincore.c | 1 + mm/pagewalk.c | 107 ++++-- mm/ptdump.c | 150 +++++++++ 37 files changed, 551 insertions(+), 445 deletions(-) create mode 100644 include/linux/ptdump.h create mode 100644 mm/ptdump.c -- 2.20.1