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, 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 B5847C47094 for ; Mon, 7 Jun 2021 17:07:28 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 2759861029 for ; Mon, 7 Jun 2021 17:07:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2759861029 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id B587C4B088; Mon, 7 Jun 2021 13:07:27 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id K2eJfmJO0rH6; Mon, 7 Jun 2021 13:07:23 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C45204A4E5; Mon, 7 Jun 2021 13:07:23 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 95DB249E8C for ; Mon, 7 Jun 2021 13:07:22 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GUyAPdx9+5hN for ; Mon, 7 Jun 2021 13:07:21 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 3A8A840617 for ; Mon, 7 Jun 2021 13:07:21 -0400 (EDT) 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 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) Cc: "Dr. David Alan Gilbert" , qemu-devel@nongnu.org, Marc Zyngier , Juan Quintela , Richard Henderson , linux-kernel@vger.kernel.org, Dave Martin , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Will Deacon , kvmarm@lists.cs.columbia.edu X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu 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 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm