From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751617AbdKUIpg (ORCPT ); Tue, 21 Nov 2017 03:45:36 -0500 Received: from terminus.zytor.com ([65.50.211.136]:37361 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751537AbdKUIpe (ORCPT ); Tue, 21 Nov 2017 03:45:34 -0500 Date: Tue, 21 Nov 2017 00:39:56 -0800 From: tip-bot for Dave Hansen Message-ID: Cc: hpa@zytor.com, dvlasenk@redhat.com, jpoimboe@redhat.com, torvalds@linux-foundation.org, dave.hansen@linux.intel.com, linux-kernel@vger.kernel.org, bp@alien8.de, brgerst@gmail.com, tglx@linutronix.de, luto@kernel.org, peterz@infradead.org, mingo@kernel.org Reply-To: brgerst@gmail.com, bp@alien8.de, tglx@linutronix.de, peterz@infradead.org, luto@kernel.org, mingo@kernel.org, hpa@zytor.com, dvlasenk@redhat.com, jpoimboe@redhat.com, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, dave.hansen@linux.intel.com In-Reply-To: <20171111001228.DC748A10@viggo.jf.intel.com> References: <20171111001228.DC748A10@viggo.jf.intel.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/urgent] x86/pkeys: Update documentation about availability Git-Commit-ID: c51ff2c7fc45da8b18b28c4f15eca5a9975dfb59 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: c51ff2c7fc45da8b18b28c4f15eca5a9975dfb59 Gitweb: https://git.kernel.org/tip/c51ff2c7fc45da8b18b28c4f15eca5a9975dfb59 Author: Dave Hansen AuthorDate: Fri, 10 Nov 2017 16:12:28 -0800 Committer: Ingo Molnar CommitDate: Tue, 21 Nov 2017 09:34:52 +0100 x86/pkeys: Update documentation about availability 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 Acked-by: Thomas Gleixner Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20171111001228.DC748A10@viggo.jf.intel.com Signed-off-by: Ingo Molnar --- Documentation/x86/protection-keys.txt | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/Documentation/x86/protection-keys.txt b/Documentation/x86/protection-keys.txt index fa46dcb..ecb0d2d 100644 --- a/Documentation/x86/protection-keys.txt +++ b/Documentation/x86/protection-keys.txt @@ -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