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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7781BC433F5 for ; Mon, 6 Dec 2021 11:17:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=D868taToqbGwg43cpsXCv6GvBEx72iD4k5BfR7yiQHc=; b=lnKMyCGBxBVc78 slSbielOR9pOjtoTmOfKtOYR83M/qkNjpxHtTlqExnUfIr0zYm5jx3Cp7HZP2mKZRx3IEdUu9jY3I EqfrNP+p292E1AqMpCIaqOynEQ7AuKp1k5UsFCnzaWKL6PgKsRQLO4bata07/KARyWbOeD2IoL3ub FPZROlJvlEdM5SIcD96YQQTVVgcivjlqaVZheb++r05LUnGu9oy65WfvGToLlFZfI+eGiX/7zLvgl O8jDH1CJWZVVBZ2o93ZQXhVM9c0RLG2URqJiJANaqhevr0g1O5OEkl2ujAST2U+nydDp8Qog8y6a6 MYCG0LkgME7uWzEqdklQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1muBzu-003X9z-84; Mon, 06 Dec 2021 11:17:30 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1muBzr-003X8y-Uh for linux-riscv@lists.infradead.org; Mon, 06 Dec 2021 11:17:29 +0000 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211206_031728_024117_E4CC0763 X-CRM114-Status: GOOD ( 29.27 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Am Montag, 6. Dezember 2021, 11:49:55 CET schrieb Alexandre ghiti: > On 11/25/21 00:29, Heiko St=FCbner 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 allo= ws > >> 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 do= es 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 > = _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv