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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21FA1C4332F for ; Mon, 6 Dec 2021 11:17:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242295AbhLFLVA convert rfc822-to-8bit (ORCPT ); Mon, 6 Dec 2021 06:21:00 -0500 Received: from gloria.sntech.de ([185.11.138.130]:53836 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234845AbhLFLU6 (ORCPT ); Mon, 6 Dec 2021 06:20:58 -0500 Received: from [77.23.162.171] (helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1muBzU-0003Gp-KA; Mon, 06 Dec 2021 12:17:04 +0100 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: 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 , 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, Alexandre Ghiti Cc: Alexandre ghiti Subject: Re: [PATCH v2 00/10] Introduce sv48 support without relocatable kernel Date: Mon, 06 Dec 2021 12:17:02 +0100 Message-ID: <16228030.BXmPpbjjvJ@diego> In-Reply-To: <3283761f-0506-464b-d351-af8ddecafa9b@ghiti.fr> References: <20210929145113.1935778-1-alexandre.ghiti@canonical.com> <2700575.YIZvDWadBg@diego> <3283761f-0506-464b-d351-af8ddecafa9b@ghiti.fr> MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT Content-Type: text/plain; charset="iso-8859-1" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Montag, 6. Dezember 2021, 11:49:55 CET schrieb Alexandre ghiti: > On 11/25/21 00:29, Heiko Stübner wrote: > > Am Mittwoch, 29. September 2021, 16:51:03 CET schrieb Alexandre Ghiti: > >> 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. > >> > >> Tested on: > >> - qemu rv64 sv39: OK > >> - qemu rv64 sv48: OK > >> - qemu rv64 sv39 + kasan: OK > >> - qemu rv64 sv48 + kasan: OK > >> - qemu rv32: OK > >> - Unmatched: OK > > On a beagleV (which supports only sv39) I've tested both the limit via > > the mmu-type in the devicetree and also that the fallback works when > > I disable the mmu-type in the dt, so > > > > Tested-by: Heiko Stuebner > > > > Thanks Heiko for testing this, unfortunately I could not add this tag to > the latest version as significant changes came up. > > Thanks again for taking the time to test this, No worries, I can repeat that with your new version :-) Heiko > >> > >> > >> Changes in v2: > >> - Rebase onto for-next > >> - Fix KASAN > >> - Fix stack canary > >> - Get completely rid of MAXPHYSMEM configs > >> - Add documentation > >> > >> Alexandre Ghiti (10): > >> 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 > >> > >> Documentation/riscv/vm-layout.rst | 36 ++ > >> arch/riscv/Kconfig | 35 +- > >> 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 | 2 +- > >> arch/riscv/include/asm/page.h | 10 + > >> arch/riscv/include/asm/pgalloc.h | 40 +++ > >> arch/riscv/include/asm/pgtable-64.h | 108 +++++- > >> arch/riscv/include/asm/pgtable.h | 30 +- > >> 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 | 323 +++++++++++++++--- > >> arch/riscv/mm/kasan_init.c | 91 +++-- > >> drivers/firmware/efi/libstub/efi-stub.c | 2 + > >> include/asm-generic/pgalloc.h | 24 +- > >> include/linux/sizes.h | 1 + > >> 21 files changed, 615 insertions(+), 131 deletions(-) > >> > >> > > > > > > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv >