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=-3.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED 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 3C4CCC64E7B for ; Tue, 1 Dec 2020 15:18:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DBAAC2084C for ; Tue, 1 Dec 2020 15:18:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391704AbgLAPSl convert rfc822-to-8bit (ORCPT ); Tue, 1 Dec 2020 10:18:41 -0500 Received: from out30-56.freemail.mail.aliyun.com ([115.124.30.56]:44813 "EHLO out30-56.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388815AbgLAPSl (ORCPT ); Tue, 1 Dec 2020 10:18:41 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=alimailimapcm10staff010182156082;MF=rongwei.wang@linux.alibaba.com;NM=1;PH=DS;RN=17;SR=0;TI=SMTPD_---0UHDG.XL_1606835859; Received: from 30.15.205.17(mailfrom:rongwei.wang@linux.alibaba.com fp:SMTPD_---0UHDG.XL_1606835859) by smtp.aliyun-inc.com(127.0.0.1); Tue, 01 Dec 2020 23:17:42 +0800 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Subject: Re: [PATCH 0/3] arm64:msr: Add MSR driver From: Rongwei Wang In-Reply-To: <20201201145415.GC22927@zn.tnic> Date: Tue, 1 Dec 2020 23:17:39 +0800 Cc: catalin.marinas@arm.com, Will Deacon , bjorn.andersson@linaro.org, shawnguo@kernel.org, vkoul@kernel.org, geert+renesas@glider.be, Anson.Huang@nxp.com, michael@walle.cc, krzk@kernel.org, olof@lixom.net, vincenzo.frascino@arm.com, ardb@kernel.org, masahiroy@kernel.org, gshan@redhat.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8BIT Message-Id: <8ED75067-DB02-4502-BA03-45B3519E408A@linux.alibaba.com> References: <20201130174833.41315-1-rongwei.wang@linux.alibaba.com> <20201130190331.GI6019@zn.tnic> <8724DF91-5BF0-4265-8091-F9E0C7DC2F1A@linux.alibaba.com> <20201201112647.GA22927@zn.tnic> <20201201145415.GC22927@zn.tnic> To: Borislav Petkov X-Mailer: Apple Mail (2.3608.120.23.2.4) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > 2020年12月1日 下午10:54，Borislav Petkov 写道： > > On Tue, Dec 01, 2020 at 10:33:42PM +0800, wangrongwei wrote: >> Yes, and x86 also provides two instructions with the same name in the >> instruction set, but not in ARM. > > Sorry, I can't parse what you're trying to say here. In the ARM architecture, there are no rdmsr and wrmsr instructions. In ARM, the system registers can only be accessed through msr and mrs, so the problem created by MSR driver (depend on rdmsr and wrmsr) in x86 is not necessarily present in ARM, which is very different from x86. In addition, we want cross-platform compatabilities, and fill these gaps in the ARM. > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette Regards, Rongwei Wang.