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=-7.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 9DD47C433E1 for ; Thu, 27 Aug 2020 11:31:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4BF3822B40 for ; Thu, 27 Aug 2020 11:31:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4BF3822B40 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 C91196B0029; Thu, 27 Aug 2020 07:31:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C1A5D6B002B; Thu, 27 Aug 2020 07:31:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B0A958E0008; Thu, 27 Aug 2020 07:31:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0204.hostedemail.com [216.40.44.204]) by kanga.kvack.org (Postfix) with ESMTP id 9C6E96B0029 for ; Thu, 27 Aug 2020 07:31:05 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 5CF1E3D01 for ; Thu, 27 Aug 2020 11:31:05 +0000 (UTC) X-FDA: 77196132090.02.angle66_0e0b3082706c Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin02.hostedemail.com (Postfix) with ESMTP id 2BE7F10097AA2 for ; Thu, 27 Aug 2020 11:31:05 +0000 (UTC) X-HE-Tag: angle66_0e0b3082706c X-Filterd-Recvd-Size: 2640 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf49.hostedemail.com (Postfix) with ESMTP for ; Thu, 27 Aug 2020 11:31:04 +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 F3FAE1045; Thu, 27 Aug 2020 04:31:03 -0700 (PDT) Received: from [192.168.1.190] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E08D53F68F; Thu, 27 Aug 2020 04:31:01 -0700 (PDT) Subject: Re: [PATCH 25/35] kasan: introduce CONFIG_KASAN_HW_TAGS To: Andrey Konovalov , Dmitry Vyukov , Catalin Marinas , kasan-dev@googlegroups.com Cc: Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Elena Petrova , Branislav Rankov , Kevin Brodsky , Will Deacon , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <8a499341bbe4767a4ee1d3b8acb8bd83420ce3a5.1597425745.git.andreyknvl@google.com> From: Vincenzo Frascino Message-ID: Date: Thu, 27 Aug 2020 12:33:15 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <8a499341bbe4767a4ee1d3b8acb8bd83420ce3a5.1597425745.git.andreyknvl@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Rspamd-Queue-Id: 2BE7F10097AA2 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000580, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Andrey, On 8/14/20 6:27 PM, Andrey Konovalov wrote: > +config=C2=B7KASAN_HW_TAGS > +=C2=BB bool=C2=B7"Hardware=C2=B7tag-based=C2=B7mode" > +=C2=BB depends=C2=B7on=C2=B7HAVE_ARCH_KASAN_HW_TAGS > +=C2=BB depends=C2=B7on=C2=B7SLUB > +=C2=BB help > +=C2=BB =C2=B7=C2=B7Enables=C2=B7hardware=C2=B7tag-based=C2=B7KASAN=C2=B7= mode. > + > +=C2=BB =C2=B7=C2=B7This=C2=B7mode=C2=B7requires=C2=B7both=C2=B7Memory=C2= =B7Tagging=C2=B7Extension=C2=B7and=C2=B7Top=C2=B7Byte=C2=B7Ignore > +=C2=BB =C2=B7=C2=B7support=C2=B7by=C2=B7the=C2=B7CPU=C2=B7and=C2=B7the= refore=C2=B7is=C2=B7only=C2=B7supported=C2=B7for=C2=B7modern=C2=B7arm64 > +=C2=BB =C2=B7=C2=B7CPUs=C2=B7(MTE=C2=B7added=C2=B7in=C2=B7ARMv8.5=C2=B7= ISA). > + I do not thing we should make KASAN_HW_TAGS MTE specific especially becau= se it is in the common code (e.g. SPARC ADI might want to implement it in futur= e). Probably would be better to provide some indirection in the generic code = an implement the MTE backend entirely in arch code. Thoughts? --=20 Regards, Vincenzo