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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 43DD3C43218 for ; Thu, 25 Apr 2019 17:11:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A481A2084F for ; Thu, 25 Apr 2019 17:11:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728151AbfDYRL3 (ORCPT ); Thu, 25 Apr 2019 13:11:29 -0400 Received: from mout.kundenserver.de ([212.227.17.24]:43263 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726026AbfDYRL3 (ORCPT ); Thu, 25 Apr 2019 13:11:29 -0400 Received: from oxbaltgw05.schlund.de ([172.19.246.11]) by mrelayeu.kundenserver.de (mreue108 [213.165.67.113]) with ESMTPSA (Nemesis) id 1MD9Ox-1hSCLR1rYP-009AJI; Thu, 25 Apr 2019 19:11:12 +0200 Date: Thu, 25 Apr 2019 19:11:11 +0200 (CEST) From: Stefan Wahren To: Jeremy Linton , linux-arm-kernel@lists.infradead.org Cc: mlangsdo@redhat.com, suzuki.poulose@arm.com, marc.zyngier@arm.com, catalin.marinas@arm.com, julien.thierry@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, Andre.Przywara@arm.com, Dave.Martin@arm.com, shankerd@codeaurora.org Message-ID: <1375455768.808427.1556212271639@email.ionos.de> In-Reply-To: <20190415212129.1112-10-jeremy.linton@arm.com> References: <20190415212129.1112-1-jeremy.linton@arm.com> <20190415212129.1112-10-jeremy.linton@arm.com> Subject: Re: [v8 09/10] arm64: add sysfs vulnerability show for speculative store bypass MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Priority: 3 Importance: Medium X-Mailer: Open-Xchange Mailer v7.8.4-Rev54 X-Originating-Client: open-xchange-appsuite X-Provags-ID: V03:K1:EiwVhB3XXpe5Oux+q614hCOdrvLuQGrnO8GGL3/xbZcxZB66jeP 2XUTmYwWTClu/ijBWkfrNG9zxOszrtmhgX6tooI+bv1jOIgOvGerroF0Nc/HUjAHBgcbY8b Gs9YLOy3WfZwhjyfueGlniJIoshi/IYxp1voAnZkVGVwnuK26T7SAY6c4lJq7nNpFK3Cq9z Z2s+fNc/AlZxykK+Y8DIg== X-UI-Out-Filterresults: notjunk:1;V03:K0:1lppWUuFHUA=:PffeInm+yTx1FG9of4fjBs Av09yqD3QH6snduQEbdiil+BWZuOvSzOgIArXW32O1Hh/uOgyLUFXT18vJwv9RTPkslw7MAIQ x6FNU9zrq+/Lssc/+Be4nbBVq61W+mcdBWY3xkkM15/DPKEHvW9IlrXotvsccA0PcwkaGuwm9 l7enK/8pqG8dy+UptK5uvurJazcEWxIyhb0/rAwZK6o9bYO0vuzo9hDb+wI5boD1WHo3jOg03 Bo1smk0tMmXbwxjBrE4+BnpHor3rzDIWv0E7X0Y1Wjx3vqwxlgnNsiwdXkOsR9kieLNKzCplH 6ktRDM3Uy9+NdeiPoyPTxDAciJn9yfO+FqirhqjNZElcNIGQ6hrnKeY0xA26Kd10HTbBBAk80 iLXSmdzGGJ1fGGulVgeWOGzvVuqCeiZVkouJVaQWADrSFYbCe4C+sAo7wSoXC5H3H2GfAsDqk 2W3vbso7pLY2DVH52BpG7uWX0LJAbTBsZ9xq4KWbgpK9vjT/MyAM4dVlLI/sdu4BiavW9bHAb dKk695/QTNV96cP1M7ZomqzNc8AnMP6YQCtRd9omUw574/c78FkdX17HceyYVSjkDJ916Fs17 hzc7Yt5QJOgp67nlBsNVf+7J/NsoiUMhLN37vqzoqPjsD5zLP3ozKcmKnZGshSrCeL/5oApbm 5ArfqR1XsTCjZtRaIp4i3FCoZaf9NNQKPke5RUj3pkFaRfCrDcXyhPyo7X/tP5RzK1aP5WMKE 0iLIZYyYtbMV1PdAPvPXCV4mIsBbUZnrNv12C103RWpeTfPMB7aV7knZEi8= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Jeremy Linton hat am 15. April 2019 um 23:21 geschrieben: > > > Return status based on ssbd_state and __ssb_safe. If the > mitigation is disabled, or the firmware isn't responding then > return the expected machine state based on a whitelist of known > good cores. > > Given a heterogeneous machine, the overall machine vulnerability > defaults to safe but is reset to unsafe when we miss the whitelist > and the firmware doesn't explicitly tell us the core is safe. > In order to make that work we delay transitioning to vulnerable > until we know the firmware isn't responding to avoid a case > where we miss the whitelist, but the firmware goes ahead and > reports the core is not vulnerable. If all the cores in the > machine have SSBS, then __ssb_safe will remain true. > > Signed-off-by: Jeremy Linton Tested-by: Stefan Wahren on a Raspberry Pi 3 B