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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 A3001C43458 for ; Wed, 15 Jul 2020 17:10:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 597AB2065F for ; Wed, 15 Jul 2020 17:10:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 597AB2065F 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 9727F6B0005; Wed, 15 Jul 2020 13:09:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7E57B6B0007; Wed, 15 Jul 2020 13:09:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 611B36B0008; Wed, 15 Jul 2020 13:09:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0188.hostedemail.com [216.40.44.188]) by kanga.kvack.org (Postfix) with ESMTP id 40A576B0005 for ; Wed, 15 Jul 2020 13:09:58 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 00C362C8B for ; Wed, 15 Jul 2020 17:09:58 +0000 (UTC) X-FDA: 77040947676.18.knee37_280298326efb Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id CA27E100ED9DE for ; Wed, 15 Jul 2020 17:09:57 +0000 (UTC) X-HE-Tag: knee37_280298326efb X-Filterd-Recvd-Size: 3773 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf25.hostedemail.com (Postfix) with ESMTP for ; Wed, 15 Jul 2020 17:09:57 +0000 (UTC) Received: from localhost.localdomain (unknown [95.146.230.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BD73B2065E; Wed, 15 Jul 2020 17:09:54 +0000 (UTC) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, Will Deacon , Dave P Martin , Vincenzo Frascino , Szabolcs Nagy , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne , Andrew Morton Subject: [PATCH v7 28/29] arm64: mte: Kconfig entry Date: Wed, 15 Jul 2020 18:08:43 +0100 Message-Id: <20200715170844.30064-29-catalin.marinas@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200715170844.30064-1-catalin.marinas@arm.com> References: <20200715170844.30064-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: CA27E100ED9DE X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 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 Cc: Will Deacon --- Notes: v7: - Binutils gained initial support for MTE in 2.32.0. However, a late architecture addition (LDGM/STGM) is only supported in the newer 2.32.x and 2.33 versions. Change the AS_HAS_MTE option to also chec= k for stgm in addition to .arch armv8.5-a+memtag. =20 v6: - Remove select ARCH_USES_PG_ARCH_2, no longer defined. =20 v5: - Remove duplicate ARMv8.5 menu entry. =20 v4: - select ARCH_USES_PG_ARCH_2. - remove ARCH_NO_SWAP. - default y. arch/arm64/Kconfig | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 66dc41fd49f2..32ceff21acc1 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1664,6 +1664,37 @@ config ARCH_RANDOM provides a high bandwidth, cryptographically secure hardware random number generator. =20 +config ARM64_AS_HAS_MTE + # Binutils gained initial support for MTE in 2.32.0. However, a + # late architecture addition (LDGM/STGM) is only supported in + # the newer 2.32.x and 2.33 versions. + def_bool $(as-instr,.arch armv8.5-a+memtag\nstgm xzr$(comma)[x0]) + +config ARM64_MTE + bool "Memory Tagging Extension support" + default y + depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI + select ARCH_USES_HIGH_VMA_FLAGS + 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 =20 config ARM64_SVE