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=-1.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS 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 5AD33C282D7 for ; Wed, 30 Jan 2019 15:00:37 +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 0986620870 for ; Wed, 30 Jan 2019 15:00:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="pOf+J0V8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0986620870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-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.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=dbYAJMTGvAtdnnrA9edKh2oH5cfAy70Q9HDHObi8aMI=; b=pOf+J0V8rySM5MrZJ9Y4WmHdf tVv8MJp03I1SWGgRW0bqVQTTW8zWcNaqHJiwuuZtB3sWN2VltZL30IPmiPRefr5cxPO6aZJKYmQfi o89C7fJ9lweTmPQqOThzS2nuOqotK/JVYu9dyYAVu/0c1G1n4jWeddl61Jt7AyRifIA5mmGEStZRu ppkO5iIvg4OBvqer/yIudDbgaTkuKzoAmlBheHE/5aswmJLX3Z9+cXx4lTE90hRUF5Wzd3DH71C26 M4lLV/CND/wm+8CzxwJKvqYRSSjenpgH5W9Cdo7YQyF/T8IGGHFYKrzt0IwXZcDDlgjHtNAYwKqBH wbsyoU8rQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gorLu-0004Sf-NI; Wed, 30 Jan 2019 15:00:34 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gorLs-0004SG-22 for linux-arm-kernel@lists.infradead.org; Wed, 30 Jan 2019 15:00:33 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9CAC7EBD; Wed, 30 Jan 2019 07:00:31 -0800 (PST) Received: from [10.37.9.196] (unknown [10.37.9.196]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D38463F589; Wed, 30 Jan 2019 07:00:29 -0800 (PST) Subject: Re: [PATCH v3 0/1] arm64: Add workaround for Fujitsu A64FX erratum 010001 To: "Zhang, Lei" References: <8898674D84E3B24BA3A2D289B872026A6A2C04E6@G01JPEXMBKW03> From: James Morse Message-ID: Date: Wed, 30 Jan 2019 15:00:28 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <8898674D84E3B24BA3A2D289B872026A6A2C04E6@G01JPEXMBKW03> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190130_070032_280994_EC56B0E6 X-CRM114-Status: GOOD ( 14.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 'Mark Rutland' , 'Catalin Marinas' , "'will.deacon@arm.com'" , "'linux-kernel@vger.kernel.org'" , "'linux-arm-kernel@lists.infradead.org'" Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi! On 01/29/2019 12:29 PM, Zhang, Lei wrote: > On some variants of the Fujitsu-A64FX cores ver(1.0, 1.1), > memory accesses may cause undefined fault (Data abort, DFSC=0b111111). > This problem will be fixed by next version of Fujitsu-A64FX. > > This fault occurs under a specific hardware condition > when a load/store instruction perform an address translation using: > case-1 TTBR0_EL1 with TCR_EL1.NFD0 == 1. > case-2 TTBR0_EL2 with TCR_EL2.NFD0 == 1. > case-3 TTBR1_EL1 with TCR_EL1.NFD1 == 1. > case-4 TTBR1_EL2 with TCR_EL2.NFD1 == 1. > And this fault occurs completely spurious. > > Since TCR_ELx.NFD1 is set to '1' at the kernel in versions > past 4.17, the case-3 or case-4 may happen. e03e61c3173c ("arm64: kaslr: Set TCR_EL1.NFD1 when CONFIG_RANDOMIZE_BASE=y") ? So you'd never see it if you disabled CONFIG_RANDOMIZE_BASE? Thanks, James _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel