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=-8.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 83285C43467 for ; Tue, 13 Oct 2020 18:23:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 39B73215A4 for ; Tue, 13 Oct 2020 18:23:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728307AbgJMSXL (ORCPT ); Tue, 13 Oct 2020 14:23:11 -0400 Received: from mga09.intel.com ([134.134.136.24]:19465 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728103AbgJMSXK (ORCPT ); Tue, 13 Oct 2020 14:23:10 -0400 IronPort-SDR: udyXnqnPbSXl1mM2a8yKkJg3sNEq8k/nrAZbudM8D0AHvb6i6516WkA62u3y21ivvMz0NeDVd8 u8jvvv8xuZFA== X-IronPort-AV: E=McAfee;i="6000,8403,9773"; a="166077870" X-IronPort-AV: E=Sophos;i="5.77,371,1596524400"; d="scan'208";a="166077870" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2020 11:23:09 -0700 IronPort-SDR: y9TXXuh5e1eeoBKQ1hSVopxpD4BEK5Ev5lOHm/BcNe8BcXHU3kk2TbU2myxrXItgFCwaIMq9v9 GN7i39xYdIhQ== X-IronPort-AV: E=Sophos;i="5.77,371,1596524400"; d="scan'208";a="346277003" Received: from murawskx-mobl.amr.corp.intel.com (HELO [10.209.9.29]) ([10.209.9.29]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2020 11:23:09 -0700 Subject: Re: [PATCH RFC V3 3/9] x86/pks: Enable Protection Keys Supervisor (PKS) To: ira.weiny@intel.com, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , Peter Zijlstra Cc: Fenghua Yu , Dan Williams , x86@kernel.org, Dave Hansen , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org References: <20201009194258.3207172-1-ira.weiny@intel.com> <20201009194258.3207172-4-ira.weiny@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201009194258.3207172-4-ira.weiny@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 10/9/20 12:42 PM, ira.weiny@intel.com wrote: > +/* > + * PKS is independent of PKU and either or both may be supported on a CPU. > + * Configure PKS if the cpu supports the feature. > + */ Let's at least be consistent about CPU vs. cpu in a single comment. :) > +static void setup_pks(void) > +{ > + if (!IS_ENABLED(CONFIG_ARCH_HAS_SUPERVISOR_PKEYS)) > + return; > + if (!cpu_feature_enabled(X86_FEATURE_PKS)) > + return; If you put X86_FEATURE_PKS in disabled-features.h, you can get rid of the explicit CONFIG_ check. > + cr4_set_bits(X86_CR4_PKS); > +} > + > /* > * This does the hard work of actually picking apart the CPU stuff... > */ > @@ -1544,6 +1558,7 @@ static void identify_cpu(struct cpuinfo_x86 *c) > > x86_init_rdrand(c); > setup_pku(c); > + setup_pks(); > > /* > * Clear/Set all flags overridden by options, need do it > diff --git a/mm/Kconfig b/mm/Kconfig > index 6c974888f86f..1b9bc004d9bc 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -822,6 +822,8 @@ config ARCH_USES_HIGH_VMA_FLAGS > bool > config ARCH_HAS_PKEYS > bool > +config ARCH_HAS_SUPERVISOR_PKEYS > + bool > > config PERCPU_STATS > bool "Collect percpu memory statistics" >