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=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 62BB9C4321D for ; Wed, 15 Aug 2018 17:31:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7573D21502 for ; Wed, 15 Aug 2018 17:31:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7573D21502 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=winds.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730263AbeHOUYu (ORCPT ); Wed, 15 Aug 2018 16:24:50 -0400 Received: from winds.org ([68.75.195.9]:46008 "EHLO winds.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729388AbeHOUYu (ORCPT ); Wed, 15 Aug 2018 16:24:50 -0400 X-Greylist: delayed 442 seconds by postgrey-1.27 at vger.kernel.org; Wed, 15 Aug 2018 16:24:50 EDT Received: by winds.org (Postfix, from userid 100) id A5CE3AAC744; Wed, 15 Aug 2018 13:24:25 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by winds.org (Postfix) with ESMTP id 9A08DAAC73F; Wed, 15 Aug 2018 13:24:25 -0400 (EDT) Date: Wed, 15 Aug 2018 13:24:25 -0400 (EDT) From: Byron Stanoszek To: linux-kernel@vger.kernel.org cc: Greg Kroah-Hartman , Thomas Gleixner Subject: Re: [PATCH 4.18 00/79] 4.18.1-stable review Message-ID: User-Agent: Alpine 2.21 (LNX 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Greg & Thomas, I'd like to report a regression in Linux 4.18.1 regarding the L1TF patches. The kernel no longer thinks I have SMT enabled in the BIOS. This works fine in 4.18.0. Not sure if this matters, but in my particular 4-core system, my third core is broken (core #2). So I must boot using "maxcpus=2" and then online the other cores & SMT threads at startup using: echo 1 > /sys/devices/system/cpu/cpu3/online echo 1 > /sys/devices/system/cpu/cpu4/online echo 1 > /sys/devices/system/cpu/cpu5/online echo 1 > /sys/devices/system/cpu/cpu7/online In 4.18.0, dmesg shows: smpboot: Booting Node 0 Processor 3 APIC 0x6 smpboot: Booting Node 0 Processor 4 APIC 0x1 smpboot: Booting Node 0 Processor 5 APIC 0x3 smpboot: Booting Node 0 Processor 7 APIC 0x7 In 4.18.1, dmesg shows: smpboot: Booting Node 0 Processor 3 APIC 0x6 smpboot: Booting Node 0 Processor 4 APIC 0x1 smpboot: CPU 4 is now offline smpboot: Booting Node 0 Processor 5 APIC 0x3 smpboot: CPU 5 is now offline smpboot: Booting Node 0 Processor 7 APIC 0x7 smpboot: CPU 7 is now offline and I get an "Operation cancelled" error in the shell when trying to online 4, 5, and 7. In 4.18.1, /sys/devices/system/cpu/smt/control says "notsupported". - - - A possible second regression is the following: My CPU normally runs at 3600 MHz. I usually run my CPU at 2800 MHz to keep from overheating under full load (it is a fanless system). I do this by running "echo 1 > /sys/class/thermal/cooling_device5/cur_state", and confirm with "cat /proc/cpuinfo" (shows 2800). This works in 4.18.0 but not in 4.18.1. I get no error from the "echo" command (and the state reads back as "1"), but the CPU remains running at 3600 MHz. Thanks, -Byron