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=-10.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,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 96CF1C47094 for ; Mon, 7 Jun 2021 17:09:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 5F25360FEF for ; Mon, 7 Jun 2021 17:09:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5F25360FEF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cqm1ECsCo4maFq78n/nBu3Hhm3FvsUsD98GLaAKfh58=; b=3eqxitYGc8ex6i flRwAhoToZDH2KV/63TkCzIKOztTaiauJQxIHJO1e5PsjwJfaT4oAOxFxe0JFTHQov4A9dh7a3uRh eLSWTo3sS0sdfaqe+krx5kyJHocphOFRuNq6LSvS5VhutTmKS8N3tGuOn/n+dK/nmPjRTAGHntEBH KdkXYTpD/gkch16exnhwMiaL+8e+rsx5QMU2DJBKItuEtxrjauMw+x1s3eBm0GLj08xnMuHhpN7oL ur+NOUynDRVeu76sKwxOADVQSCbcgR9Uea1uyJJYblfdfzPxk6Gs3Er6R7WCmX2OqpssEn4vqZs6h 0fEXCsG0vXL3SqCBrbfw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lqIij-004giV-8W; Mon, 07 Jun 2021 17:07:25 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lqIie-004ggE-OZ for linux-arm-kernel@lists.infradead.org; Mon, 07 Jun 2021 17:07:22 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 48E3B6101A; Mon, 7 Jun 2021 17:07:17 +0000 (UTC) Date: Mon, 7 Jun 2021 18:07:14 +0100 From: Catalin Marinas To: Steven Price 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 Subject: Re: [PATCH v14 2/8] arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage() Message-ID: <20210607170714.GA17957@arm.com> References: <20210607110816.25762-1-steven.price@arm.com> <20210607110816.25762-3-steven.price@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210607110816.25762-3-steven.price@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210607_100720_837884_651335F8 X-CRM114-Status: GOOD ( 10.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel