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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46260C00140 for ; Thu, 18 Aug 2022 18:20:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233693AbiHRSUw (ORCPT ); Thu, 18 Aug 2022 14:20:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231651AbiHRSUv (ORCPT ); Thu, 18 Aug 2022 14:20:51 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C23ACE306; Thu, 18 Aug 2022 11:20:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660846851; x=1692382851; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=ULlY3fpvctgrPTNh/dIyRvXpP5N6EgQSL6XrK00sqzY=; b=hvou1AxCNquka03XZa2GztBXvLyI00wmt3bCfLRd/nLeHuZWSEZtQOPc XUbAuxosHHH/MVAm8RqNi/+8kv6XeGgj3A2lHJbibJzkCo1IcpeuTc2Hz EIS72gwmi5LzQfw62rr/hRwuI2FtvpTrvjnvMxqPDQNQzQoppayQnwMf4 nQ6DHDAMJaa654orhG300XbXf3UreMxGrOv0IHLzL90KvMI7cQFm5bthH iuP/amk62gqMYfqEgejNOMU3ZGjIsEGoerXeKyojzinyHfngXPfhECDYe JX+MqAKXUQI9AnrKu496Ye9jIXO2irMKW8E/w7GaDOpjAQasuDOuxxW2z w==; X-IronPort-AV: E=McAfee;i="6500,9779,10443"; a="354573989" X-IronPort-AV: E=Sophos;i="5.93,247,1654585200"; d="scan'208";a="354573989" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2022 11:20:50 -0700 X-IronPort-AV: E=Sophos;i="5.93,247,1654585200"; d="scan'208";a="558638429" Received: from rvmiele-mobl1.amr.corp.intel.com (HELO desk) ([10.209.23.54]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2022 11:20:50 -0700 Date: Thu, 18 Aug 2022 11:20:48 -0700 From: Pawan Gupta To: Borislav Petkov Cc: Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tony.luck@intel.com, antonio.gomez.iglesias@linux.intel.com, Daniel Sneddon , andrew.cooper3@citrix.com, Josh Poimboeuf Subject: Re: [PATCH v2] x86/bugs: Add "unknown" reporting for MMIO Stale Data Message-ID: <20220818182048.lsgtc52g6va376v2@desk> References: <79d2455c75bdbad4e68a3843fe1c1e67826008e6.1659562129.git.pawan.kumar.gupta@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Thu, Aug 18, 2022 at 12:08:24PM +0200, Borislav Petkov wrote: > On Wed, Aug 03, 2022 at 02:41:32PM -0700, Pawan Gupta wrote: > > diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c > > index 6761668100b9..fe3f7e762b80 100644 > > --- a/arch/x86/kernel/cpu/bugs.c > > +++ b/arch/x86/kernel/cpu/bugs.c > > @@ -433,7 +433,8 @@ static void __init mmio_select_mitigation(void) > > u64 ia32_cap; > > > > if (!boot_cpu_has_bug(X86_BUG_MMIO_STALE_DATA) || > > - cpu_mitigations_off()) { > > + boot_cpu_has_bug(X86_BUG_MMIO_UNKNOWN) || > > + cpu_mitigations_off()) { > > mmio_mitigation = MMIO_MITIGATION_OFF; > > return; > > } > > Needs also: > > diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c > index d08c5589fa59..da7c361f47e0 100644 > --- a/arch/x86/kernel/cpu/bugs.c > +++ b/arch/x86/kernel/cpu/bugs.c > @@ -539,6 +539,8 @@ static void __init md_clear_update_mitigation(void) > pr_info("TAA: %s\n", taa_strings[taa_mitigation]); > if (boot_cpu_has_bug(X86_BUG_MMIO_STALE_DATA)) > pr_info("MMIO Stale Data: %s\n", mmio_strings[mmio_mitigation]); > + else if (boot_cpu_has_bug(X86_BUG_MMIO_UNKNOWN)) > + pr_info("MMIO Stale Data: Unknown: No mitigations\n"); > } > > static void __init md_clear_select_mitigation(void) > > I've added it. Thanks