From patchwork Sun Mar 14 09:10:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 12137225 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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,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 7A93AC433DB for ; Sun, 14 Mar 2021 09:10:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A286764DD7 for ; Sun, 14 Mar 2021 09:10:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A286764DD7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ghiti.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 10D5F6B0006; Sun, 14 Mar 2021 05:10:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E46B6B006E; Sun, 14 Mar 2021 05:10:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F3BBD6B0070; Sun, 14 Mar 2021 05:10:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0038.hostedemail.com [216.40.44.38]) by kanga.kvack.org (Postfix) with ESMTP id DB2E56B0006 for ; Sun, 14 Mar 2021 05:10:37 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 91303181AF5E1 for ; Sun, 14 Mar 2021 09:10:37 +0000 (UTC) X-FDA: 77917909314.22.6F4C848 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) by imf04.hostedemail.com (Postfix) with ESMTP id 74B5313A for ; Sun, 14 Mar 2021 09:10:36 +0000 (UTC) X-Originating-IP: 2.7.49.219 Received: from debian.home (lfbn-lyo-1-457-219.w2-7.abo.wanadoo.fr [2.7.49.219]) (Authenticated sender: alex@ghiti.fr) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id 7201E20002; Sun, 14 Mar 2021 09:10:29 +0000 (UTC) From: Alexandre Ghiti To: Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Arnd Bergmann , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-mm@kvack.org Cc: Alexandre Ghiti Subject: [PATCH v3 0/3] Move kernel mapping outside the linear mapping Date: Sun, 14 Mar 2021 05:10:24 -0400 Message-Id: <20210314091027.21592-1-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Stat-Signature: ata66se1g7hhuyakystcmjh4jnpbjo4w X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 74B5313A Received-SPF: none (ghiti.fr>: No applicable sender policy available) receiver=imf04; identity=mailfrom; envelope-from=""; helo=relay7-d.mail.gandi.net; client-ip=217.70.183.200 X-HE-DKIM-Result: none/none X-HE-Tag: 1615713036-139491 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: I decided to split sv48 support in small series to ease the review. This patchset pushes the kernel mapping (modules and BPF too) to the last 4GB of the 64bit address space, this allows to: - implement relocatable kernel (that will come later in another patchset) that requires to move the kernel mapping out of the linear mapping to avoid to copy the kernel at a different physical address. - have a single kernel that is not relocatable (and then that avoids the performance penalty imposed by PIC kernel) for both sv39 and sv48. The first patch implements this behaviour, the second patch introduces a documentation that describes the virtual address space layout of the 64bit kernel and the last patch is taken from my sv48 series where I simply added the dump of the modules/kernel/BPF mapping. I removed the Reviewed-by on the first patch since it changed enough from last time and deserves a second look. Changes in v3: - Fix broken nommu build as reported by kernel test robot by protecting the kernel mapping only in 64BIT and MMU configs, by reverting the introduction of load_sz_pmd and by not exporting load_sz/load_pa anymore since they were not initialized in nommu config. Changes in v2: - Fix documentation about direct mapping size which is 124GB instead of 126GB. - Fix SPDX missing header in documentation. - Fix another checkpatch warning about EXPORT_SYMBOL which was not directly below variable declaration. Alexandre Ghiti (3): riscv: Move kernel mapping outside of linear mapping Documentation: riscv: Add documentation that describes the VM layout riscv: Prepare ptdump for vm layout dynamic addresses Documentation/riscv/index.rst | 1 + Documentation/riscv/vm-layout.rst | 63 +++++++++++++++++++++++ arch/riscv/boot/loader.lds.S | 3 +- arch/riscv/include/asm/page.h | 17 ++++++- arch/riscv/include/asm/pgtable.h | 37 ++++++++++---- arch/riscv/include/asm/set_memory.h | 1 + arch/riscv/kernel/head.S | 3 +- arch/riscv/kernel/module.c | 6 +-- arch/riscv/kernel/setup.c | 5 ++ arch/riscv/kernel/vmlinux.lds.S | 3 +- arch/riscv/mm/fault.c | 13 +++++ arch/riscv/mm/init.c | 78 ++++++++++++++++++++++------- arch/riscv/mm/kasan_init.c | 9 ++++ arch/riscv/mm/physaddr.c | 2 +- arch/riscv/mm/ptdump.c | 67 ++++++++++++++++++++----- 15 files changed, 258 insertions(+), 50 deletions(-) create mode 100644 Documentation/riscv/vm-layout.rst