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Tue, 13 Oct 2020 18:23:10 +0000 (UTC) IronPort-SDR: ePn+AQ2fJsFHkMlVkrcECzVm6kgI5Fxs8bTll8mUqlkq2K2jgO2ZMh5VU5d3oSn3YfqQWzsPRV 2zSOL0slMlSA== X-IronPort-AV: E=McAfee;i="6000,8403,9773"; a="145824279" X-IronPort-AV: E=Sophos;i="5.77,371,1596524400"; d="scan'208";a="145824279" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.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: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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) > =20 > x86_init_rdrand(c); > setup_pku(c); > + setup_pks(); > =20 > /* > * 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 > =20 > config PERCPU_STATS > bool "Collect percpu memory statistics" >=20