From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754881AbbIPSBp (ORCPT ); Wed, 16 Sep 2015 14:01:45 -0400 Received: from mga09.intel.com ([134.134.136.24]:17283 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752636AbbIPRtJ (ORCPT ); Wed, 16 Sep 2015 13:49:09 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,540,1437462000"; d="scan'208";a="562957978" Subject: [PATCH 18/26] x86, pkeys: add Kconfig prompt to existing config option To: dave@sr71.net Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org From: Dave Hansen Date: Wed, 16 Sep 2015 10:49:09 -0700 References: <20150916174903.E112E464@viggo.jf.intel.com> In-Reply-To: <20150916174903.E112E464@viggo.jf.intel.com> Message-Id: <20150916174909.B4D79DCE@viggo.jf.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I don't have a strong opinion on whether we need this or not. Protection Keys has relatively little code associated with it, and it is not a heavyweight feature to keep enabled. However, I can imagine that folks would still appreciate being able to disable it. Here's the option if folks want it. --- b/arch/x86/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) diff -puN arch/x86/Kconfig~pkeys-40-kconfig-prompt arch/x86/Kconfig --- a/arch/x86/Kconfig~pkeys-40-kconfig-prompt 2015-09-16 10:48:19.287329737 -0700 +++ b/arch/x86/Kconfig 2015-09-16 10:48:19.291329919 -0700 @@ -1696,8 +1696,18 @@ config X86_INTEL_MPX If unsure, say N. config X86_INTEL_MEMORY_PROTECTION_KEYS + prompt "Intel Memory Protection Keys" def_bool y + # Note: only available in 64-bit mode depends on CPU_SUP_INTEL && X86_64 + ---help--- + Memory Protection Keys provides a mechanism for enforcing + page-based protections, but without requiring modification of the + page tables when an application changes protection domains. + + For details, see Documentation/x86/protection-keys.txt + + If unsure, say y. config EFI bool "EFI runtime service support" _