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=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 0E2F5C433E0 for ; Wed, 6 Jan 2021 16:44:20 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 BD5AD23135 for ; Wed, 6 Jan 2021 16:44:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BD5AD23135 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject: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=Pe5d/Or3s/1FYF7LXdD2SB0Yz0NmjvqFAaKAMkvvX1A=; b=QckcIRVc8YuX2At15hPe51Om5 icZVfVZhXmJ4ODKKVkiDc9cYgjtrenmaFd8r/Z0xWYZhaZQxY5ZgT2XaDO1buqan7e14cDadXPf4I xpKZtKAo8+aNINuW1TqUcem4uAPrgKwkwuEQHbdhobRkWsUJ0Zu1rbAhrCuRBhIxwSxPlgrwmBdRP Rk/pk1o88JOgfQWTyfKRCGgJuYo34eyuWDPphFbWtObT7chCHsSywYEJIqt/r7ZMDeu/ObLNpXxSF gm6V50KHppQt12PbXth5rX+GOuV94Rmu2y0KeHYHtTAmQ6RRpAJZs/iNQzD7SCBR5tKgpJl0jzYtb ndpl/3rvw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kxBtM-0004OG-FG; Wed, 06 Jan 2021 16:42:36 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kxBtI-0004Nn-Sc for linux-arm-kernel@lists.infradead.org; Wed, 06 Jan 2021 16:42:33 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6278423136; Wed, 6 Jan 2021 16:42:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1609951351; bh=wU5/hSQmjyU1JL5g7k1xb3fISw69WCPfgnVr0jjxhhs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=KB/Etz3uNVe37B1mwrZKRmCRVCoOi0NOKAGDgYEEc1nRvfVxtdcyKkSOIoxBgBaT0 8UOHrPDR6ar9ObCfDBiKxsvrUzn7mcKzEgxV8rMYWcOj3iLEwrAaHXmqkqk0IJmW4l +M6yjKY+e8fnYyGUTmfmdiGaSplJCQ9hx9Agj32ETlf2GRPRrU+7Wz5nGBRVdcnc38 BbzjPIY2I05ijo0F02pPQ3wce1nXTbnXlqx0kSXKAIQyficDWUo3pCY/8mSUYHn+6e XfENKLP1WB11W+8PNel4CsC2YxgAPfiz9lrSMLO6tf2R0UCUoH0KpX0BsZn9nszDth 6Y5wgVZs60gjw== Date: Wed, 6 Jan 2021 16:42:26 +0000 From: Will Deacon To: Vincenzo Frascino Subject: Re: [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Message-ID: <20210106164225.GA1916@willie-the-truck> References: <20210106115519.32222-1-vincenzo.frascino@arm.com> <9a78cd4f-838d-0410-62fa-16e4ab921681@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <9a78cd4f-838d-0410-62fa-16e4ab921681@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-20210106_114233_026255_7913B3EE X-CRM114-Status: GOOD ( 25.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Branislav Rankov , Marco Elver , Catalin Marinas , Evgenii Stepanov , Will Deacon , linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, Alexander Potapenko , linux-arm-kernel@lists.infradead.org, Andrey Konovalov , Andrey Ryabinin , Dmitry Vyukov 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 Wed, Jan 06, 2021 at 04:35:29PM +0000, Vincenzo Frascino wrote: > > On 1/6/21 11:55 AM, Vincenzo Frascino wrote: > > This patchset implements the asynchronous mode support for ARMv8.5-A > > Memory Tagging Extension (MTE), which is a debugging feature that allows > > to detect with the help of the architecture the C and C++ programmatic > > memory errors like buffer overflow, use-after-free, use-after-return, etc. > > > > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI > > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any > > subset of its address space that is multiple of a 16 bytes granule. MTE > > is based on a lock-key mechanism where the lock is the tag associated to > > the physical memory and the key is the tag associated to the virtual > > address. > > When MTE is enabled and tags are set for ranges of address space of a task, > > the PE will compare the tag related to the physical memory with the tag > > related to the virtual address (tag check operation). Access to the memory > > is granted only if the two tags match. In case of mismatch the PE will raise > > an exception. > > > > The exception can be handled synchronously or asynchronously. When the > > asynchronous mode is enabled: > > - Upon fault the PE updates the TFSR_EL1 register. > > - The kernel detects the change during one of the following: > > - Context switching > > - Return to user/EL0 > > - Kernel entry from EL1 > > - Kernel exit to EL1 > > - If the register has been updated by the PE the kernel clears it and > > reports the error. > > > > The series contains as well an optimization to mte_assign_mem_tag_range(). > > > > The series is based on linux 5.11-rc2. > > > > To simplify the testing a tree with the new patches on top has been made > > available at [1]. > > > > [1] https://git.gitlab.arm.com/linux-arm/linux-vf.git mte/v10.async > > > > Cc: Catalin Marinas > > Cc: Will Deacon > > Will is not in arm anymore :( Sorry Will... I will fix this in v2. If only you worked for payroll ;) Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel