From patchwork Mon Jan 4 17:56:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 59148 Delivered-To: patch@linaro.org Received: by 10.112.130.2 with SMTP id oa2csp5503573lbb; Mon, 4 Jan 2016 10:00:00 -0800 (PST) X-Received: by 10.98.68.68 with SMTP id r65mr79435751pfa.108.1451930400593; Mon, 04 Jan 2016 10:00:00 -0800 (PST) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [2001:1868:205::9]) by mx.google.com with ESMTPS id kz6si18064973pab.18.2016.01.04.10.00.00 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 04 Jan 2016 10:00:00 -0800 (PST) Received-SPF: pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aG9PC-0002U3-5A; Mon, 04 Jan 2016 17:58:54 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aG9Oq-00025K-QH for linux-arm-kernel@lists.infradead.org; Mon, 04 Jan 2016 17:58:34 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 79ED44FA; Mon, 4 Jan 2016 09:57:43 -0800 (PST) Received: from leverpostej.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C05AA3F246; Mon, 4 Jan 2016 09:58:13 -0800 (PST) From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Subject: [PATCHv2 05/18] arm64: unmap idmap earlier Date: Mon, 4 Jan 2016 17:56:38 +0000 Message-Id: <1451930211-22460-6-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1451930211-22460-1-git-send-email-mark.rutland@arm.com> References: <1451930211-22460-1-git-send-email-mark.rutland@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160104_095833_119263_B48A2802 X-CRM114-Status: UNSURE ( 8.80 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [217.140.101.70 listed in list.dnswl.org] -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, lorenzo.pieralisi@arm.com, arnd@arndb.de, ard.biesheuvel@linaro.org, catalin.marinas@arm.com, will.deacon@arm.com, jeremy.linton@arm.com, ryabinin.a.a@gmail.com, labbott@fedoraproject.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org During boot we leave the idmap in place until paging_init, as we previously had to wait for the zero page to become allocated and accessible. Now that we have a statically-allocated zero page, we can uninstall the idmap much earlier in the boot process, making it far eaier to spot accidental use of physical addresses. This also brings the cold boot path in line with the secondary boot path. Signed-off-by: Mark Rutland Cc: Ard Biesheuvel Cc: Catalin Marinas Cc: Jeremy Linton Cc: Laura Abbott Cc: Will Deacon --- arch/arm64/kernel/setup.c | 6 ++++++ arch/arm64/mm/mmu.c | 6 ------ 2 files changed, 6 insertions(+), 6 deletions(-) -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index f6621ba..cfed56f 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -314,6 +314,12 @@ void __init setup_arch(char **cmdline_p) */ local_async_enable(); + /* + * TTBR0 is only used for the identity mapping at this stage. Make it + * point to zero page to avoid speculatively fetching new entries. + */ + cpu_uninstall_idmap(); + efi_init(); arm64_memblock_init(); diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index e85a719..c3ea9df 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -463,12 +463,6 @@ void __init paging_init(void) fixup_executable(); bootmem_init(); - - /* - * TTBR0 is only used for the identity mapping at this stage. Make it - * point to zero page to avoid speculatively fetching new entries. - */ - cpu_uninstall_idmap(); } /*