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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham 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 22396C4BA18 for ; Wed, 26 Feb 2020 18:06:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D9F7724656 for ; Wed, 26 Feb 2020 18:06:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D9F7724656 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A3FB26B0092; Wed, 26 Feb 2020 13:06:07 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9C9E86B0093; Wed, 26 Feb 2020 13:06:07 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 81A186B0095; Wed, 26 Feb 2020 13:06:07 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0132.hostedemail.com [216.40.44.132]) by kanga.kvack.org (Postfix) with ESMTP id 67A9E6B0092 for ; Wed, 26 Feb 2020 13:06:07 -0500 (EST) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 47205180AD801 for ; Wed, 26 Feb 2020 18:06:07 +0000 (UTC) X-FDA: 76533057174.16.soap01_35621f07c7733 X-HE-Tag: soap01_35621f07c7733 X-Filterd-Recvd-Size: 3127 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf23.hostedemail.com (Postfix) with ESMTP for ; Wed, 26 Feb 2020 18:06:06 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 668E131B; Wed, 26 Feb 2020 10:06:06 -0800 (PST) Received: from arrakis.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id F03553F881; Wed, 26 Feb 2020 10:06:04 -0800 (PST) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Cc: Will Deacon , Vincenzo Frascino , Szabolcs Nagy , Richard Earnshaw , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne , linux-mm@kvack.org, linux-arch@vger.kernel.org Subject: [PATCH v2 18/19] arm64: mte: Kconfig entry Date: Wed, 26 Feb 2020 18:05:25 +0000 Message-Id: <20200226180526.3272848-19-catalin.marinas@arm.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200226180526.3272848-1-catalin.marinas@arm.com> References: <20200226180526.3272848-1-catalin.marinas@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Vincenzo Frascino Add Memory Tagging Extension support to the arm64 kbuild. Signed-off-by: Vincenzo Frascino Co-developed-by: Catalin Marinas Signed-off-by: Catalin Marinas --- arch/arm64/Kconfig | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 0b30e884e088..ed20f5b0e122 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1541,6 +1541,38 @@ config ARCH_RANDOM =20 endmenu =20 +menu "ARMv8.5 architectural features" + +config ARM64_AS_HAS_MTE + def_bool $(as-instr,.arch armv8.5-a+memtag) + +config ARM64_MTE + bool "Memory Tagging Extension support" + depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI + select ARCH_USES_HIGH_VMA_FLAGS + select ARCH_NO_SWAP + help + Memory Tagging (part of the ARMv8.5 Extensions) provides + architectural support for run-time, always-on detection of + various classes of memory error to aid with software debugging + to eliminate vulnerabilities arising from memory-unsafe + languages. + + This option enables the support for the Memory Tagging + Extension at EL0 (i.e. for userspace). + + Selecting this option allows the feature to be detected at + runtime. Any secondary CPU not implementing this feature will + not be allowed a late bring-up. + + Userspace binaries that want to use this feature must + explicitly opt in. The mechanism for the userspace is + described in: + + Documentation/arm64/memory-tagging-extension.rst. + +endmenu + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y