From patchwork Thu Jun 17 13:17:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 12327863 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=-11.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 5149FC2B9F4 for ; Thu, 17 Jun 2021 13:18:14 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 18BF96100B for ; Thu, 17 Jun 2021 13:18:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 18BF96100B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ghiti.fr Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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: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:In-Reply-To:References: List-Owner; bh=nGA2Ta5pUIK4CI897+6NteIeigG4WrU1AkJrLnK8j/k=; b=GP9DcVTjXsdMKI //1NJoN015MHwi5aVPTOlP5QDbuMbULlXPT9/WtGWls7+t8vCKUTLt3NjWB5LOqh7iSLyM4G9I6Aq NhEaz0pJgEx2jQljuOYVf0izQ5w3o2OJ/zSg3xdurfsP/ilrf+92lzHbJV9hyN6yu5tBQYSd1k825 iZdp8k+vN3sTFmZbwbej7cz9Xpu+jZWNstOWfiraTx+C/SQFpXvBhoVJEzDE4LYTMi7ytIJgu+gOR ZxwrjnD724FEc51Hhl4P7oZj8JCPi+VrQzjWQ8Dmpmml+JLdeHXXQd+Sh+YO3aYjJJKiSYBV3kECR 7kDOqAMETkQD6S5MZAiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ltru8-00AQsN-Uv; Thu, 17 Jun 2021 13:17:56 +0000 Received: from relay1-d.mail.gandi.net ([217.70.183.193]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ltru5-00AQqd-IN for linux-riscv@lists.infradead.org; Thu, 17 Jun 2021 13:17:55 +0000 Received: (Authenticated sender: alex@ghiti.fr) by relay1-d.mail.gandi.net (Postfix) with ESMTPSA id 5BDAD240004; Thu, 17 Jun 2021 13:17:47 +0000 (UTC) From: Alexandre Ghiti To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Christoph Hellwig , Zong Li , Anup Patel , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH v6 0/2] Map the kernel with correct permissions the first time Date: Thu, 17 Jun 2021 15:17:32 +0200 Message-Id: <20210617131734.1923932-1-alex@ghiti.fr> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210617_061753_795738_DFD3CFDC X-CRM114-Status: GOOD ( 10.71 ) 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: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org The kernel permissions are fixed after the kernel page table is created: avoid that by mapping the kernel 'correctly' the first time. Patch 1 introduces a new helper to set kernel mapping permissions while avoiding all the casts when using set_memory_* API. Patch 2 is the bulk of this work and deals with mapping the kernel with the right permissions. Changes in v6: * load_sz was placed in init section but is now used in kernel address conversions macros, so remove this attribute. Changes in v5: * Remove non-relevant commits to this patchset that raised issues * Make load_sz non-static as it is used in kernel address conversions macros * Rebased on top for-next Changes in v4: * Add patch 1 as noted by Jisheng * Changes patch 2 title as suggested by Anup * Add Reviewed-by from Anup Changes in v3: * Add a patch that factorizes kernel address conversions * Add a helper called set_kernel_memory in its own patch, as suggested by Christoph * Prefer IS_ENABLED over #ifdef, as suggested by Christoph * Split overly long lines, as suggested by Christoph * Simplify kernel mapping by mapping ALL text as readonly and taking advantage of already present code that enables write for init text before free_initmem_default. Changes in v2: * Rebased on top of for-next (and "riscv: mm: fix build errors caused by mk_pmd()") * Get rid of protect_kernel_linear_mapping_text_rodata as suggested by Jisheng * Improve code in general compared to previous RFC Alexandre Ghiti (2): riscv: Introduce set_kernel_memory helper riscv: Map the kernel with correct permissions the first time arch/riscv/include/asm/page.h | 13 +++- arch/riscv/include/asm/sections.h | 17 +++++ arch/riscv/include/asm/set_memory.h | 13 ++-- arch/riscv/kernel/setup.c | 11 +-- arch/riscv/mm/init.c | 108 ++++++++++++---------------- arch/riscv/mm/pageattr.c | 10 +++ 6 files changed, 91 insertions(+), 81 deletions(-)