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x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=gmail.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755938AbeCHNea (ORCPT ); Thu, 8 Mar 2018 08:34:30 -0500 Received: from mail-wm0-f65.google.com ([74.125.82.65]:53077 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755936AbeCHNeC (ORCPT ); Thu, 8 Mar 2018 08:34:02 -0500 X-Google-Smtp-Source: AG47ELubRx/ztiMbpRUumXS2CEOEPCOkdaRfezsNPah4dbcqKeUHtm75HzKd2I/f4LRRZjbUiRg4Uw== Subject: Re: [PATCH 00/45] arm Spectre fix backport review for LTS 4.9 To: =?UTF-8?Q?Pali_Roh=c3=a1r?= , Pavel Machek Cc: Alex Shi , sre@kernel.org, linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org, aaro.koskinen@iki.fi, patrikbachan@gmail.com, serge@hallyn.com, abcloriens@gmail.com, clayton@craftyguy.net, martijn@brixit.nl, sakari.ailus@linux.intel.com, =?UTF-8?Q?Filip_Matijevi=c4=87?= , Marc Zyngier , Will Deacon , Ard Biesheuvel , Catalin Marinas , stable@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <1519908862-11425-1-git-send-email-alex.shi@linaro.org> <20180308122715.GB21514@amd> <20180308132139.apabmgw4magrp3d7@pali> From: Ivaylo Dimitrov Message-ID: <36c7b85a-dadb-6e05-6c19-58c6ff6ae728@gmail.com> Date: Thu, 8 Mar 2018 15:33:58 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180308132139.apabmgw4magrp3d7@pali> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Hi, On 8.03.2018 15:21, Pali Rohár wrote: > On Thursday 08 March 2018 13:27:15 Pavel Machek wrote: >> Hi! >> >>> Resent without non-upstream patches. >>> >>> This backport patchset fixed the spectre issue, it's original branch: >>> https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=kpti >>> A few dependency or fixingpatches are also picked up, if they are necessary >>> and no functional changes. >>> >>> No bug found from kernelci.org and lkft testing. It also could be gotten from: >>> >>> git://git.linaro.org/kernel/linux-linaro-stable.git v4.9-spectre-upstream-only >>> >>> Comments are appreciated! >> >> Not entirely related to this patched, but... I have few older ARM >> boards here, and Nokia N9000 I really care about. >> >> AFAICT Meltdown is arm64 only? > > IIRC ARMv7 is not affected by meltdown. > >> Spectre affects the older boards, too, right? Was there any work done >> on that? cpuinfo says "ARMv7" for N900. > > I remember that I saw some spectre patches for ARMv7 on LKML. > > In general for ARMv7 it is problematic as mitigation needs to change IBE > bit which is not possible on OMAP HS devices. But for Nokia N900 there > is special code which do it via smc instruction (function > rx51_secure_update_aux_cr(), see also nokia_n900_legacy_init()). > I *think* N900 should be safe from spectre attack as a side effect of thumb2 errata (430973) workaround (BTB is flushed on every context switch), but don't quote me on that one, lets more knowledgeable than me to confirm first. Ivo