From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753997AbdKITNF (ORCPT ); Thu, 9 Nov 2017 14:13:05 -0500 Received: from mga04.intel.com ([192.55.52.120]:47661 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752622AbdKITNE (ORCPT ); Thu, 9 Nov 2017 14:13:04 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,370,1505804400"; d="scan'208";a="3137071" Subject: [PATCH] x86, pkeys: update documentation about availability To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, dave.hansen@linux.intel.com From: Dave Hansen Date: Thu, 09 Nov 2017 11:12:49 -0800 Message-Id: <20171109191249.B63E9BDB@viggo.jf.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Hansen Now that CPUs that implement Memory Protection Keys are publicly available we can be a bit less oblique about where it is available. Signed-off-by: Dave Hansen --- b/Documentation/x86/protection-keys.txt | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff -puN Documentation/x86/protection-keys.txt~pkeys-update Documentation/x86/protection-keys.txt --- a/Documentation/x86/protection-keys.txt~pkeys-update 2017-11-09 10:36:53.381467202 -0800 +++ b/Documentation/x86/protection-keys.txt 2017-11-09 10:43:15.527466249 -0800 @@ -1,5 +1,10 @@ -Memory Protection Keys for Userspace (PKU aka PKEYs) is a CPU feature -which will be found on future Intel CPUs. +Memory Protection Keys for Userspace (PKU aka PKEYs) is a feature +which is found on Intel's Skylake "Scalable Processor" Server CPUs. +It will be avalable in future non-server parts. + +For anyone wishing to test or use this feature, it is available in +Amazon's EC2 C5 instances and is known to work there using an Ubuntu +17.04 image. Memory Protection Keys provides a mechanism for enforcing page-based protections, but without requiring modification of the page tables _