From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754879AbdL1RvB (ORCPT ); Thu, 28 Dec 2017 12:51:01 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:58918 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754346AbdL1RN7 (ORCPT ); Thu, 28 Dec 2017 12:13:59 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Ingo Molnar" , "Thomas Gleixner" , "Linus Torvalds" , "Peter Zijlstra" , "Tony Luck" , "Borislav Petkov" Date: Thu, 28 Dec 2017 17:05:44 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 125/204] x86/microcode/intel: Disable late loading on model 79 In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.52-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Borislav Petkov commit 723f2828a98c8ca19842042f418fb30dd8cfc0f7 upstream. Blacklist Broadwell X model 79 for late loading due to an erratum. Signed-off-by: Borislav Petkov Acked-by: Tony Luck Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20171018111225.25635-1-bp@alien8.de Signed-off-by: Ingo Molnar [bwh: Backported to 3.16: substitute literal value for INTEL_FAM6_BROADWELL_X] Signed-off-by: Ben Hutchings --- --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -267,6 +267,18 @@ static int get_ucode_fw(void *to, const return 0; } +static bool is_blacklisted(unsigned int cpu) +{ + struct cpuinfo_x86 *c = &cpu_data(cpu); + + if (c->x86 == 6 && c->x86_model == 0x4F) { + pr_err_once("late loading on model 79 is disabled.\n"); + return true; + } + + return false; +} + static enum ucode_state request_microcode_fw(int cpu, struct device *device, bool refresh_fw) { @@ -275,6 +287,9 @@ static enum ucode_state request_microcod const struct firmware *firmware; enum ucode_state ret; + if (is_blacklisted(cpu)) + return UCODE_NFOUND; + sprintf(name, "intel-ucode/%02x-%02x-%02x", c->x86, c->x86_model, c->x86_mask); @@ -299,6 +314,9 @@ static int get_ucode_user(void *to, cons static enum ucode_state request_microcode_user(int cpu, const void __user *buf, size_t size) { + if (is_blacklisted(cpu)) + return UCODE_NFOUND; + return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user); }