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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 67723C433E0 for ; Wed, 10 Mar 2021 07:05:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 03BE964F81 for ; Wed, 10 Mar 2021 07:05:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 03BE964F81 Authentication-Results: mail.kernel.org; dmarc=fail (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 6EC9B8D0174; Wed, 10 Mar 2021 02:05:24 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6AEEB8D0148; Wed, 10 Mar 2021 02:05:24 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5647D8D0174; Wed, 10 Mar 2021 02:05:24 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0100.hostedemail.com [216.40.44.100]) by kanga.kvack.org (Postfix) with ESMTP id 3E1A58D0148 for ; Wed, 10 Mar 2021 02:05:24 -0500 (EST) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 3F8C5702 for ; Wed, 10 Mar 2021 07:05:22 +0000 (UTC) X-FDA: 77903078484.22.9EC74E7 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf18.hostedemail.com (Postfix) with ESMTP id 77A3D200038F for ; Wed, 10 Mar 2021 07:05:22 +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 663BB1FB; Tue, 9 Mar 2021 23:05:20 -0800 (PST) Received: from [10.163.67.114] (unknown [10.163.67.114]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B289F3F70D; Tue, 9 Mar 2021 23:05:17 -0800 (PST) Subject: Re: [PATCH] arm64: mte: Map hotplugged memory as Normal Tagged To: Catalin Marinas , linux-arm-kernel@lists.infradead.org Cc: linux-mm@kvack.org, Patrick Daly , Will Deacon , Andrew Morton , Vincenzo Frascino , David Hildenbrand References: <20210309122601.5543-1-catalin.marinas@arm.com> From: Anshuman Khandual Message-ID: Date: Wed, 10 Mar 2021 12:35:53 +0530 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: <20210309122601.5543-1-catalin.marinas@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Stat-Signature: t4bxjpek36iwmdd4q7yf4oeqo3jzndj8 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 77A3D200038F Received-SPF: none (arm.com>: No applicable sender policy available) receiver=imf18; identity=mailfrom; envelope-from=""; helo=foss.arm.com; client-ip=217.140.110.172 X-HE-DKIM-Result: none/none X-HE-Tag: 1615359922-442260 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: On 3/9/21 5:56 PM, Catalin Marinas wrote: > In a system supporting MTE, the linear map must allow reading/writing > allocation tags by setting the memory type as Normal Tagged. Currently, > this is only handled for memory present at boot. Hotplugged memory uses > Normal non-Tagged memory. > > Introduce pgprot_mhp() for hotplugged memory and use it in > add_memory_resource(). The arm64 code maps pgprot_mhp() to > pgprot_tagged(). > > Note that ZONE_DEVICE memory should not be mapped as Tagged and > therefore setting the memory type in arch_add_memory() is not feasible. > > Signed-off-by: Catalin Marinas > Fixes: 0178dc761368 ("arm64: mte: Use Normal Tagged attributes for the linear map") > Reported-by: Patrick Daly > Link: https://lore.kernel.org/r/1614745263-27827-1-git-send-email-pdaly@codeaurora.org > Cc: # 5.10.x > Cc: Will Deacon > Cc: Andrew Morton > Cc: Vincenzo Frascino > Cc: David Hildenbrand Reviewed-by: Anshuman Khandual