From patchwork Fri Jun 16 08:50:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 10880 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp1184302vqr; Fri, 16 Jun 2023 02:01:36 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ4Ih3kfD2XL1xRrEyGsEcd2Fu9LW2531lqWbATcazpkScSE+z83WyF0f/EynL/lJDioBdab X-Received: by 2002:a17:90a:f018:b0:25c:a96:93ca with SMTP id bt24-20020a17090af01800b0025c0a9693camr9562022pjb.15.1686906095746; Fri, 16 Jun 2023 02:01:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1686906095; cv=none; d=google.com; s=arc-20160816; b=E+m8pUNE2lPiOwrTuM7mFbqlfvuFlQ9XqNsxlshkvhDmZxj/XV+G8eMjxj2OH5p1v+ 5dbxnqv4TFy7/YxvEPCLjRYNT3lzFf/QEg1J7oAJNGOB3A1t5HhTT73qyNqnqP8+bC9X eV2zWoDclwzJ2OUdt3Pg9X0N2e4M6KN7LavKQ0Spcm+egY5qrkQSkashh1wI8T5JCl0t PfskpToKNS10fSDxtqnpjGtZfJCmgPLImCKPyS34zTDyh3zkQaFTJZqAzIKtAeYy4G30 nkg9sJhBXFNt2zXquQmHler+Wy39WkgRRkLrfy2tqqsDUwNcsG6z8+8vBugf4BiLYjir qXFQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from:dkim-signature; bh=PyArw1CsytcyuLj9NhzGD3K7alpxHiZOAmwqGwptScM=; b=nVzoj5GALmhWouqg+UcyUFFmTnQfzKYwxoAwZRDNfwnsPp/N8CCv6h52Uba3HrafuQ oaGV6glBkq0WmpUvA8B/cDJIUX+cH1jCp+VWuq0D5QIvtTnGekEq/QOoD24XJNaAWZah rSWfPGLjAG1Q4rT389fpBbDb623NtPLpdr/zAlvNrR9AxENY4SRY9C8yosGQypUkgb3o n0KnFk9/8Pe223krZ6p4lIXydH10HlF6NZdXw7oPQ54O+PWS8B901hMn/Wf/VGO4oPO0 OOsi0NcNbP/wmQALTG26+WzVJ+C0sIfKgnIcHv4ukAopwehZ+pClm+NS7m6o37sUJrK2 ra+g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=ck0ec7mn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id w67-20020a636246000000b0053fb7d0fa78si14982600pgb.812.2023.06.16.02.01.22; Fri, 16 Jun 2023 02:01:35 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=ck0ec7mn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243515AbjFPIvD (ORCPT + 99 others); Fri, 16 Jun 2023 04:51:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230505AbjFPIvB (ORCPT ); Fri, 16 Jun 2023 04:51:01 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 091B71FEC; Fri, 16 Jun 2023 01:51:00 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8B018623BF; Fri, 16 Jun 2023 08:50:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D119C433C0; Fri, 16 Jun 2023 08:50:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686905458; bh=UifOGBhwjuFfbJuOcG7ahrWbKbx6ngB0ASSIbVF4SDg=; h=From:To:Cc:Subject:Date:From; b=ck0ec7mnOXOJHNfyR0Cuz10mDHrTJaqzBdkJJzGI4J5mxsDw+S1o8grrhlLF0PRRJ Blj2mY565pFuuPac9zqDUVIJhp2GAgrXs6ZInsTC/6pWhSlWp11aHMJNQn9eODGEeh VSvFVRn4+rUIJbQbY7eRV1WOekMqiki5eGyfHIlx8ZQ2xx8xQp/apWKMDOp78uimel sukig/TwDMPtoPPprD/GNVQGbNgwIMeqg0FWBqqu8wfvHogW2g7+TEtlFT4sJSL93V o47E4rKDkN2DN+bQ/ziUVnSQt1N7BfNFA4zob4IPcJj+QLlo2BCg+LbIduSrfniXxn WV2mvb8jIG0NA== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Michael Ellerman , Mike Rapoport , Nadav Amit , "Naveen N. Rao" , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v2 00/12] mm: jit/text allocator Date: Fri, 16 Jun 2023 11:50:26 +0300 Message-Id: <20230616085038.4121892-1-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768849246369839897?= X-GMAIL-MSGID: =?utf-8?q?1768849246369839897?= From: "Mike Rapoport (IBM)" Hi, module_alloc() is used everywhere as a mean to allocate memory for code. Beside being semantically wrong, this unnecessarily ties all subsystmes that need to allocate code, such as ftrace, kprobes and BPF to modules and puts the burden of code allocation to the modules code. Several architectures override module_alloc() because of various constraints where the executable memory can be located and this causes additional obstacles for improvements of code allocation. A centralized infrastructure for code allocation allows allocations of executable memory as ROX, and future optimizations such as caching large pages for better iTLB performance and providing sub-page allocations for users that only need small jit code snippets. Rick Edgecombe proposed perm_alloc extension to vmalloc [1] and Song Liu proposed execmem_alloc [2], but both these approaches were targeting BPF allocations and lacked the ground work to abstract executable allocations and split them from the modules core. Thomas Gleixner's suggested to express module allocation restrictions and requirements as struct mod_alloc_type_params [3] that would define ranges, protections and other parameters for different types of allocations used by modules and following that suggestion Song separated allocations of different types in modules (commit ac3b43283923 ("module: replace module_layout with module_memory")) and posted "Type aware module allocator" set [4]. I liked the idea of parametrising code allocation requirements as a structure, but I believe the original proposal and Song's module allocator were too module centric, so I came up with these patches. This set splits code allocation from modules by introducing execmem_text_alloc(), execmem_data_alloc(), execmem_free(), jit_text_alloc() and jit_free() APIs, replaces call sites of module_alloc() and module_memfree() with the new APIs and implements core text and related allocation in a central place. Instead of architecture specific overrides for module_alloc(), the architectures that require non-default behaviour for text allocation must fill execmem_alloc_params structure and implement execmem_arch_params() that returns a pointer to that structure. If an architecture does not implement execmem_arch_params(), the defaults compatible with the current modules::module_alloc() are used. The intended semantics of the new APIs is that execmem APIs should be used to allocate memory that must reside close to the kernel image because of addressing mode restrictions, e.g modules on many architectures or dynamic ftrace trampolines on x86. The jit APIs are intended for users that can place code anywhere in vmalloc area, like kprobes on most architectures and BPF on arm/arm64. While two distinct API cover the major cases, there is still might be need for arch-specific overrides for some of the usecases. For example, riscv uses a dedicated range for BPF allocations in order to be able to use relative addressing, but for kprobes riscv can use the entire vmalloc area. For such overrides we might introduce jit_text_alloc variant that gets start + end parameters to restrict the range like Mark Rutland suggested and then use that variant in arch override. The new infrastructure allows decoupling of kprobes and ftrace from modules, and most importantly it paves the way for ROX allocations for executable memory. For now I've dropped patches that enable ROX allocations on x86 because with them modprobe takes ten times more. To make modprobe fast with ROX allocations more work is required to text poking infrastructure, but this work is not a prerequisite for this series. [1] https://lore.kernel.org/lkml/20201120202426.18009-1-rick.p.edgecombe@intel.com/ [2] https://lore.kernel.org/all/20221107223921.3451913-1-song@kernel.org/ [3] https://lore.kernel.org/all/87v8mndy3y.ffs@tglx/ [4] https://lore.kernel.org/all/20230526051529.3387103-1-song@kernel.org v2 changes: * Separate "module" and "others" allocations with execmem_text_alloc() and jit_text_alloc() * Drop ROX entablement on x86 * Add ack for nios2 changes, thanks Dinh Nguyen v1: https://lore.kernel.org/all/20230601101257.530867-1-rppt@kernel.org Mike Rapoport (IBM) (12): nios2: define virtual address space for modules mm: introduce execmem_text_alloc() and jit_text_alloc() mm/execmem, arch: convert simple overrides of module_alloc to execmem mm/execmem, arch: convert remaining overrides of module_alloc to execmem modules, execmem: drop module_alloc mm/execmem: introduce execmem_data_alloc() arm64, execmem: extend execmem_params for generated code definitions riscv: extend execmem_params for kprobes allocations powerpc: extend execmem_params for kprobes allocations arch: make execmem setup available regardless of CONFIG_MODULES x86/ftrace: enable dynamic ftrace without CONFIG_MODULES kprobes: remove dependcy on CONFIG_MODULES arch/Kconfig | 2 +- arch/arm/kernel/module.c | 32 ------ arch/arm/mm/init.c | 36 ++++++ arch/arm64/include/asm/memory.h | 8 ++ arch/arm64/include/asm/module.h | 6 - arch/arm64/kernel/kaslr.c | 3 +- arch/arm64/kernel/module.c | 47 -------- arch/arm64/kernel/probes/kprobes.c | 7 -- arch/arm64/mm/init.c | 56 +++++++++ arch/loongarch/kernel/module.c | 6 - arch/loongarch/mm/init.c | 20 ++++ arch/mips/kernel/module.c | 10 +- arch/mips/mm/init.c | 19 ++++ arch/nios2/include/asm/pgtable.h | 5 +- arch/nios2/kernel/module.c | 28 +++-- arch/parisc/kernel/module.c | 12 +- arch/parisc/mm/init.c | 22 +++- arch/powerpc/kernel/kprobes.c | 16 +-- arch/powerpc/kernel/module.c | 37 ------ arch/powerpc/mm/mem.c | 59 ++++++++++ arch/riscv/kernel/module.c | 10 -- arch/riscv/kernel/probes/kprobes.c | 10 -- arch/riscv/mm/init.c | 34 ++++++ arch/s390/kernel/ftrace.c | 4 +- arch/s390/kernel/kprobes.c | 4 +- arch/s390/kernel/module.c | 42 +------ arch/s390/mm/init.c | 41 +++++++ arch/sparc/kernel/module.c | 33 +----- arch/sparc/mm/Makefile | 2 + arch/sparc/mm/execmem.c | 25 ++++ arch/sparc/net/bpf_jit_comp_32.c | 8 +- arch/x86/Kconfig | 1 + arch/x86/kernel/ftrace.c | 16 +-- arch/x86/kernel/kprobes/core.c | 4 +- arch/x86/kernel/module.c | 51 --------- arch/x86/mm/init.c | 54 +++++++++ include/linux/execmem.h | 155 +++++++++++++++++++++++++ include/linux/moduleloader.h | 15 --- kernel/bpf/core.c | 14 +-- kernel/kprobes.c | 51 +++++---- kernel/module/Kconfig | 1 + kernel/module/main.c | 45 ++------ kernel/trace/trace_kprobe.c | 11 ++ mm/Kconfig | 3 + mm/Makefile | 1 + mm/execmem.c | 177 +++++++++++++++++++++++++++++ mm/mm_init.c | 2 + 47 files changed, 813 insertions(+), 432 deletions(-) create mode 100644 arch/sparc/mm/execmem.c create mode 100644 include/linux/execmem.h create mode 100644 mm/execmem.c base-commit: 44c026a73be8038f03dbdeef028b642880cf1511