From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17233C54E4A for ; Mon, 11 May 2020 23:44:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0044E2078E for ; Mon, 11 May 2020 23:44:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726908AbgEKXoR (ORCPT ); Mon, 11 May 2020 19:44:17 -0400 Received: from mga12.intel.com ([192.55.52.136]:31878 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725854AbgEKXoQ (ORCPT ); Mon, 11 May 2020 19:44:16 -0400 IronPort-SDR: ZV6kH7rHHc0V7ZNBj2xkjIetKeBo+ZPXObEakGE4RWfXaKkQKkfpowroZxrY4ysGHtm7Ge5v9T SVZ6mr31k74g== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2020 16:44:14 -0700 IronPort-SDR: IlzjwgVcRN8w8KjpMWXPQFlZgjhoMvhZOzRg0HF/aSBLH7Xhr4d8Bub5s0UyJmwvSqnRl80Js4 iX8vGqenE2qg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,381,1583222400"; d="scan'208";a="265323025" Received: from tmeseri-mobl.ger.corp.intel.com (HELO [10.254.97.79]) ([10.254.97.79]) by orsmga006.jf.intel.com with ESMTP; 11 May 2020 16:44:13 -0700 Subject: Re: [PATCH v3 1/3] arch/x86: Rename config X86_INTEL_MEMORY_PROTECTION_KEYS to generic x86 To: Babu Moger , corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, pbonzini@redhat.com, sean.j.christopherson@intel.com Cc: x86@kernel.org, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, mchehab+samsung@kernel.org, changbin.du@intel.com, namit@vmware.com, bigeasy@linutronix.de, yang.shi@linux.alibaba.com, asteinhauser@google.com, anshuman.khandual@arm.com, jan.kiszka@siemens.com, akpm@linux-foundation.org, steven.price@arm.com, rppt@linux.vnet.ibm.com, peterx@redhat.com, dan.j.williams@intel.com, arjunroy@google.com, logang@deltatee.com, thellstrom@vmware.com, aarcange@redhat.com, justin.he@arm.com, robin.murphy@arm.com, ira.weiny@intel.com, keescook@chromium.org, jgross@suse.com, andrew.cooper3@citrix.com, pawan.kumar.gupta@linux.intel.com, fenghua.yu@intel.com, vineela.tummalapalli@intel.com, yamada.masahiro@socionext.com, sam@ravnborg.org, acme@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org References: <158923982830.20128.14580309786525588408.stgit@naples-babu.amd.com> <158923997443.20128.16545619590919566266.stgit@naples-babu.amd.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <158923997443.20128.16545619590919566266.stgit@naples-babu.amd.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 5/11/20 4:32 PM, Babu Moger wrote: > AMD's next generation of EPYC processors support the MPK (Memory > Protection Keys) feature. > > So, rename X86_INTEL_MEMORY_PROTECTION_KEYS to X86_MEMORY_PROTECTION_KEYS. > > No functional changes. > > AMD documentation for MPK feature is available at "AMD64 Architecture > Programmer’s Manual Volume 2: System Programming, Pub. 24593 Rev. 3.34, > Section 5.6.6 Memory Protection Keys (MPK) Bit". Documentation can be > obtained at the link below. I was hoping to see at least *some* justification in this changelog. Do you think having "INTEL_" will confuse users? Is there some technical merit to this change? The naming churn is an obviously bad, not technically necessary change. > +config X86_MEMORY_PROTECTION_KEYS > + # Note: This is an intermediate change to avoid config prompt to > + # the users. Eventually, the option X86_INTEL_MEMORY_PROTECTION_KEYS > + # should be changed to X86_MEMORY_PROTECTION_KEYS permanently after > + # few kernel revisions. > + def_bool X86_INTEL_MEMORY_PROTECTION_KEYS "after a few kernel revisions" is code for "never". :) Could we put an explicit date on this, please? One year seems roughly right. Or, maybe "after the v5.10" release, so that this will approach will make into at least one LTS kernel. Maybe: # Set the "INTEL_"-free option whenever the "INTEL_" one is set. # The "INTEL_" one should be removed and replaced by this option after # 5.10. This avoids exposing most 'oldconfig' users to this churn.