From patchwork Sat Mar 13 09:25:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 12136799 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 ED076C433E0 for ; Sat, 13 Mar 2021 14:34:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7B31E64DF1 for ; Sat, 13 Mar 2021 14:34:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7B31E64DF1 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 9114C6B006E; Sat, 13 Mar 2021 09:34:49 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 8E7FB6B0072; Sat, 13 Mar 2021 09:34:49 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7FE0B6B0073; Sat, 13 Mar 2021 09:34:49 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0111.hostedemail.com [216.40.44.111]) by kanga.kvack.org (Postfix) with ESMTP id 6554F6B006E for ; Sat, 13 Mar 2021 09:34:49 -0500 (EST) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 259668248076 for ; Sat, 13 Mar 2021 14:34:49 +0000 (UTC) X-FDA: 77915097498.18.CCFA28A Received: from relay5-d.mail.gandi.net (relay5-d.mail.gandi.net [217.70.183.197]) by imf03.hostedemail.com (Postfix) with ESMTP id A4CDDC185B20 for ; Sat, 13 Mar 2021 09:25:15 +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 relay5-d.mail.gandi.net (Postfix) with ESMTPSA id 32F551C0003; Sat, 13 Mar 2021 09:25:10 +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 v2 0/3] Move kernel mapping outside the linear mapping Date: Sat, 13 Mar 2021 04:25:06 -0500 Message-Id: <20210313092509.4918-1-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Stat-Signature: wrmd98yp7h1sfad9kamj3r84hg5r1bcn X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: A4CDDC185B20 Received-SPF: none (ghiti.fr>: No applicable sender policy available) receiver=imf03; identity=mailfrom; envelope-from=""; helo=relay5-d.mail.gandi.net; client-ip=217.70.183.197 X-HE-DKIM-Result: none/none X-HE-Tag: 1615627515-384866 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 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 | 18 ++++++- 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 | 3 ++ arch/riscv/kernel/vmlinux.lds.S | 3 +- arch/riscv/mm/fault.c | 13 +++++ arch/riscv/mm/init.c | 83 +++++++++++++++++++++++------ arch/riscv/mm/kasan_init.c | 9 ++++ arch/riscv/mm/physaddr.c | 2 +- arch/riscv/mm/ptdump.c | 67 ++++++++++++++++++----- 15 files changed, 262 insertions(+), 50 deletions(-) create mode 100644 Documentation/riscv/vm-layout.rst