Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756022AbdGKWJV (ORCPT ); Tue, 11 Jul 2017 18:09:21 -0400 Received: from gate.crashing.org ([63.228.1.57]:34939 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752619AbdGKWJT (ORCPT ); Tue, 11 Jul 2017 18:09:19 -0400 Message-ID: <1499808649.2865.31.camel@kernel.crashing.org> Subject: Re: [RFC v5 00/38] powerpc: Memory Protection Keys From: Benjamin Herrenschmidt To: Ram Pai , Michal Hocko Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, paulus@samba.org, mpe@ellerman.id.au, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com, arnd@arndb.de, akpm@linux-foundation.org, corbet@lwn.net, mingo@redhat.com Date: Wed, 12 Jul 2017 07:30:49 +1000 In-Reply-To: <20170711193257.GB5525@ram.oc3035372033.ibm.com> References: <1499289735-14220-1-git-send-email-linuxram@us.ibm.com> <20170711145246.GA11917@dhcp22.suse.cz> <20170711193257.GB5525@ram.oc3035372033.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-2.fc25) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 314 Lines: 9 On Tue, 2017-07-11 at 12:32 -0700, Ram Pai wrote: > Ideally the MMU looks at the PTE for keys, in order to enforce > protection. This is the case with x86 and is the case with power9 Radix > page table. Hence the keys have to be programmed into the PTE. POWER9 radix doesn't currently support keys. Cheers, Ben.