From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755863AbcGHQcT (ORCPT ); Fri, 8 Jul 2016 12:32:19 -0400 Received: from www.sr71.net ([198.145.64.142]:47341 "EHLO blackbird.sr71.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755395AbcGHQcK (ORCPT ); Fri, 8 Jul 2016 12:32:10 -0400 Subject: Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls To: Ingo Molnar References: <20160707124719.3F04C882@viggo.jf.intel.com> <20160707124728.C1116BB1@viggo.jf.intel.com> <20160707144508.GZ11498@techsingularity.net> <577E924C.6010406@sr71.net> <20160708071810.GA27457@gmail.com> Cc: Mel Gorman , linux-kernel@vger.kernel.org, x86@kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, dave.hansen@linux.intel.com, arnd@arndb.de, hughd@google.com, viro@zeniv.linux.org.uk From: Dave Hansen Message-ID: <577FD587.6050101@sr71.net> Date: Fri, 8 Jul 2016 09:32:07 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <20160708071810.GA27457@gmail.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/08/2016 12:18 AM, Ingo Molnar wrote: > So the question is, what is user-space going to do? Do any glibc > patches exist? How are the user-space library side APIs going to look > like? My goal at the moment is to get folks enabled to the point that they can start modifying apps to use pkeys without having to patch their kernels. I don't have confidence that we can design good high-level userspace interfaces without seeing some real apps try to use the low-level ones and seeing how they struggle. I had some glibc code to do the pkey alloc/free operations, but those aren't necessary if we're doing it in the kernel. Other than getting the syscall wrappers in place, I don't have any immediate plans to do anything in glibc. Was there something you were expecting to see?