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,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 21FB3C47095 for ; Wed, 9 Jun 2021 08:56:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0752361183 for ; Wed, 9 Jun 2021 08:56:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233973AbhFII6s (ORCPT ); Wed, 9 Jun 2021 04:58:48 -0400 Received: from foss.arm.com ([217.140.110.172]:53490 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233846AbhFII6p (ORCPT ); Wed, 9 Jun 2021 04:58:45 -0400 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 1DAD811FB; Wed, 9 Jun 2021 01:56:51 -0700 (PDT) Received: from [192.168.1.179] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8AA293F719; Wed, 9 Jun 2021 01:56:48 -0700 (PDT) Subject: Re: [PATCH v14 2/8] arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage() To: Catalin Marinas Cc: Marc Zyngier , Will Deacon , James Morse , Julien Thierry , Suzuki K Poulose , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Dave Martin , Mark Rutland , Thomas Gleixner , qemu-devel@nongnu.org, Juan Quintela , "Dr. David Alan Gilbert" , Richard Henderson , Peter Maydell , Haibo Xu , Andrew Jones References: <20210607110816.25762-1-steven.price@arm.com> <20210607110816.25762-3-steven.price@arm.com> <20210607170714.GA17957@arm.com> From: Steven Price Message-ID: <7a3f14de-211b-94f9-6886-393d233193d5@arm.com> Date: Wed, 9 Jun 2021 09:56:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210607170714.GA17957@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/06/2021 18:07, Catalin Marinas wrote: > On Mon, Jun 07, 2021 at 12:08:10PM +0100, Steven Price wrote: >> From: Catalin Marinas >> >> Currently, on an anonymous page fault, the kernel allocates a zeroed >> page and maps it in user space. If the mapping is tagged (PROT_MTE), >> set_pte_at() additionally clears the tags under a spinlock to avoid a >> race on the page->flags. In order to optimise the lock, clear the page >> tags on allocation in __alloc_zeroed_user_highpage() if the vma flags >> have VM_MTE set. >> >> Signed-off-by: Catalin Marinas >> Signed-off-by: Steven Price > > I think you can drop this patch now that Peter's series has been queued > via the arm64 tree: > > https://lore.kernel.org/r/20210602235230.3928842-4-pcc@google.com > Thanks for the heads up - I hadn't seen that land. I'll drop this patch from the next posting. Steve