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 C7013C47095 for ; Wed, 9 Jun 2021 08:58:13 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 402E361285 for ; Wed, 9 Jun 2021 08:58:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 402E361285 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50924 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lqu2O-0004PW-A4 for qemu-devel@archiver.kernel.org; Wed, 09 Jun 2021 04:58:12 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50936) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lqu1B-00030A-FL for qemu-devel@nongnu.org; Wed, 09 Jun 2021 04:56:57 -0400 Received: from foss.arm.com ([217.140.110.172]:46148) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lqu18-0003tX-54 for qemu-devel@nongnu.org; Wed, 09 Jun 2021 04:56:55 -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 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 Received-SPF: pass client-ip=217.140.110.172; envelope-from=steven.price@arm.com; helo=foss.arm.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Peter Maydell , "Dr. David Alan Gilbert" , Andrew Jones , Haibo Xu , Suzuki K Poulose , qemu-devel@nongnu.org, Marc Zyngier , Juan Quintela , Richard Henderson , linux-kernel@vger.kernel.org, Dave Martin , James Morse , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Will Deacon , kvmarm@lists.cs.columbia.edu, Julien Thierry Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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