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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 AF37AC4360C for ; Fri, 4 Oct 2019 21:57:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E94A222BE for ; Fri, 4 Oct 2019 21:57:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731837AbfJDV5r (ORCPT ); Fri, 4 Oct 2019 17:57:47 -0400 Received: from mga09.intel.com ([134.134.136.24]:5964 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727647AbfJDV42 (ORCPT ); Fri, 4 Oct 2019 17:56:28 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Oct 2019 14:56:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,257,1566889200"; d="scan'208";a="191710652" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.41]) by fmsmga008.fm.intel.com with ESMTP; 04 Oct 2019 14:56:26 -0700 From: Sean Christopherson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, Peter Zijlstra , Arnaldo Carvalho de Melo , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Tony Luck , Tony W Wang-oc Cc: "H. Peter Anvin" , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-edac@vger.kernel.org, Borislav Petkov , Jarkko Sakkinen Subject: [PATCH 02/16] x86/mce: WARN once if IA32_FEATURE_CONTROL MSR is left unlocked Date: Fri, 4 Oct 2019 14:56:01 -0700 Message-Id: <20191004215615.5479-3-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20191004215615.5479-1-sean.j.christopherson@intel.com> References: <20191004215615.5479-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org WARN if the IA32_FEATURE_CONTROL MSR is somehow left unlocked now that CPU initialization unconditionally locks the MSR. Signed-off-by: Sean Christopherson --- arch/x86/kernel/cpu/mce/intel.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c index 88cd9598fa57..1008f14b803b 100644 --- a/arch/x86/kernel/cpu/mce/intel.c +++ b/arch/x86/kernel/cpu/mce/intel.c @@ -117,11 +117,10 @@ static bool lmce_supported(void) * generate a #GP fault. */ rdmsrl(MSR_IA32_FEATURE_CONTROL, tmp); - if ((tmp & (FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_LMCE)) == - (FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_LMCE)) - return true; + if (WARN_ON_ONCE(!(tmp & FEATURE_CONTROL_LOCKED))) + return false; - return false; + return tmp & FEATURE_CONTROL_LMCE; } bool mce_intel_cmci_poll(void) -- 2.22.0