Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19C3CC433EF for ; Mon, 6 Dec 2021 11:08:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242233AbhLFLL6 (ORCPT ); Mon, 6 Dec 2021 06:11:58 -0500 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:51225 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236157AbhLFLLz (ORCPT ); Mon, 6 Dec 2021 06:11:55 -0500 Received: (Authenticated sender: alex@ghiti.fr) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id ECAD0E0018; Mon, 6 Dec 2021 11:08:19 +0000 (UTC) Message-ID: Date: Mon, 6 Dec 2021 12:08:19 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.1 Subject: Re: [PATCH v3 00/13] Introduce sv48 support without relocatable kernel Content-Language: en-US To: Alexandre Ghiti , Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Zong Li , Anup Patel , Atish Patra , Christoph Hellwig , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Ard Biesheuvel , Arnd Bergmann , Kees Cook , Guo Ren , Heinrich Schuchardt , Mayuresh Chitale , panqinglin2020@iscas.ac.cn, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org References: <20211206104657.433304-1-alexandre.ghiti@canonical.com> From: Alexandre ghiti In-Reply-To: <20211206104657.433304-1-alexandre.ghiti@canonical.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org And I messed Atish address, I was pretty sure I could recall it without checking, I guess I'm wrong :) Sorry for the noise, Alex On 12/6/21 11:46, Alexandre Ghiti wrote: > * Please note notable changes in memory layouts and kasan population * > > This patchset allows to have a single kernel for sv39 and sv48 without > being relocatable. > > The idea comes from Arnd Bergmann who suggested to do the same as x86, > that is mapping the kernel to the end of the address space, which allows > the kernel to be linked at the same address for both sv39 and sv48 and > then does not require to be relocated at runtime. > > This implements sv48 support at runtime. The kernel will try to > boot with 4-level page table and will fallback to 3-level if the HW does not > support it. Folding the 4th level into a 3-level page table has almost no > cost at runtime. > > Note that kasan region had to be moved to the end of the address space > since its location must be known at compile-time and then be valid for > both sv39 and sv48 (and sv57 that is coming). > > Tested on: > - qemu rv64 sv39: OK > - qemu rv64 sv48: OK > - qemu rv64 sv39 + kasan: OK > - qemu rv64 sv48 + kasan: OK > - qemu rv32: OK > > Changes in v3: > - Fix SZ_1T, thanks to Atish > - Fix warning create_pud_mapping, thanks to Atish > - Fix k210 nommu build, thanks to Atish > - Fix wrong rebase as noted by Samuel > - * Downgrade to sv39 is only possible if !KASAN (see commit changelog) * > - * Move KASAN next to the kernel: virtual layouts changed and kasan population * > > Changes in v2: > - Rebase onto for-next > - Fix KASAN > - Fix stack canary > - Get completely rid of MAXPHYSMEM configs > - Add documentation > > Alexandre Ghiti (13): > riscv: Move KASAN mapping next to the kernel mapping > riscv: Split early kasan mapping to prepare sv48 introduction > riscv: Introduce functions to switch pt_ops > riscv: Allow to dynamically define VA_BITS > riscv: Get rid of MAXPHYSMEM configs > asm-generic: Prepare for riscv use of pud_alloc_one and pud_free > riscv: Implement sv48 support > riscv: Use pgtable_l4_enabled to output mmu_type in cpuinfo > riscv: Explicit comment about user virtual address space size > riscv: Improve virtual kernel memory layout dump > Documentation: riscv: Add sv48 description to VM layout > riscv: Initialize thread pointer before calling C functions > riscv: Allow user to downgrade to sv39 when hw supports sv48 if !KASAN > > Documentation/riscv/vm-layout.rst | 48 ++- > arch/riscv/Kconfig | 37 +- > arch/riscv/configs/nommu_k210_defconfig | 1 - > .../riscv/configs/nommu_k210_sdcard_defconfig | 1 - > arch/riscv/configs/nommu_virt_defconfig | 1 - > arch/riscv/include/asm/csr.h | 3 +- > arch/riscv/include/asm/fixmap.h | 1 > arch/riscv/include/asm/kasan.h | 11 +- > arch/riscv/include/asm/page.h | 20 +- > arch/riscv/include/asm/pgalloc.h | 40 ++ > arch/riscv/include/asm/pgtable-64.h | 108 ++++- > arch/riscv/include/asm/pgtable.h | 47 +- > arch/riscv/include/asm/sparsemem.h | 6 +- > arch/riscv/kernel/cpu.c | 23 +- > arch/riscv/kernel/head.S | 4 +- > arch/riscv/mm/context.c | 4 +- > arch/riscv/mm/init.c | 408 ++++++++++++++---- > arch/riscv/mm/kasan_init.c | 250 ++++++++--- > drivers/firmware/efi/libstub/efi-stub.c | 2 > drivers/pci/controller/pci-xgene.c | 2 +- > include/asm-generic/pgalloc.h | 24 +- > include/linux/sizes.h | 1 > 22 files changed, 833 insertions(+), 209 deletions(-) > > -- > 2.32.0 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv