From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f45.google.com (mail-pa0-f45.google.com [209.85.220.45]) by kanga.kvack.org (Postfix) with ESMTP id E13F86B0005 for ; Mon, 7 Mar 2016 17:31:07 -0500 (EST) Received: by mail-pa0-f45.google.com with SMTP id bj10so86377995pad.2 for ; Mon, 07 Mar 2016 14:31:07 -0800 (PST) Received: from aserp1040.oracle.com (aserp1040.oracle.com. [141.146.126.69]) by mx.google.com with ESMTPS id q190si31610211pfq.247.2016.03.07.14.31.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Mar 2016 14:31:07 -0800 (PST) Subject: Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) References: <56DDC2B6.6020009@oracle.com> <20160307.140915.1323031236840000210.davem@davemloft.net> <56DDF22D.9090102@oracle.com> <20160307.163401.1082539079648850099.davem@davemloft.net> From: Khalid Aziz Message-ID: <56DE00FF.1080807@oracle.com> Date: Mon, 7 Mar 2016 15:30:23 -0700 MIME-Version: 1.0 In-Reply-To: <20160307.163401.1082539079648850099.davem@davemloft.net> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: David Miller Cc: corbet@lwn.net, akpm@linux-foundation.org, dingel@linux.vnet.ibm.com, bob.picco@oracle.com, kirill.shutemov@linux.intel.com, aneesh.kumar@linux.vnet.ibm.com, aarcange@redhat.com, arnd@arndb.de, sparclinux@vger.kernel.org, rob.gardner@oracle.com, mhocko@suse.cz, chris.hyser@oracle.com, richard@nod.at, vbabka@suse.cz, koct9i@gmail.com, oleg@redhat.com, gthelen@google.com, jack@suse.cz, xiexiuqi@huawei.com, Vineet.Gupta1@synopsys.com, luto@kernel.org, ebiederm@xmission.com, bsegall@google.com, geert@linux-m68k.org, dave@stgolabs.net, adobriyan@gmail.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org On 03/07/2016 02:34 PM, David Miller wrote: > From: Khalid Aziz > Date: Mon, 7 Mar 2016 14:27:09 -0700 > >> I agree with your point of view. PSTATE.mcde and TTE.mcd are set in >> response to request from userspace. If userspace asked for them to be >> set, they already know but it was the database guys that asked for >> these two functions and they are the primary customers for the ADI >> feature. I am not crazy about this idea since this extends the >> mprotect API even further but would you consider using the return >> value from mprotect to indicate if PSTATE.mcde or TTE.mcd were already >> set on the given address? > > Well, that's the idea. > > If the mprotect using MAP_ADI or whatever succeeds, then ADI is > enabled. > > Users can thus also pass MAP_ADI as a flag to mmap() to get ADI > protection from the very beginning. > MAP_ADI has been sitting in my backlog for some time. Looks like you just raised its priority ;) -- Khalid -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org