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=-2.3 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 E7CB0C2D0EA for ; Wed, 8 Apr 2020 11:14:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A477720780 for ; Wed, 8 Apr 2020 11:14:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728408AbgDHLOU (ORCPT ); Wed, 8 Apr 2020 07:14:20 -0400 Received: from lizzard.sbs.de ([194.138.37.39]:38373 "EHLO lizzard.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728321AbgDHLOU (ORCPT ); Wed, 8 Apr 2020 07:14:20 -0400 Received: from mail2.sbs.de (mail2.sbs.de [192.129.41.66]) by lizzard.sbs.de (8.15.2/8.15.2) with ESMTPS id 038BDMIQ019751 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 8 Apr 2020 13:13:22 +0200 Received: from [139.22.119.141] ([139.22.119.141]) by mail2.sbs.de (8.15.2/8.15.2) with ESMTP id 038BDHA3003063; Wed, 8 Apr 2020 13:13:18 +0200 Subject: Re: [PATCH 4/4] x86,module: Detect CRn and DRn manipulation To: David Laight , Peter Zijlstra Cc: Steven Rostedt , "tglx@linutronix.de" , "linux-kernel@vger.kernel.org" , "hch@infradead.org" , "sean.j.christopherson@intel.com" , "mingo@redhat.com" , "bp@alien8.de" , "hpa@zytor.com" , "x86@kernel.org" , "kenny@panix.com" , "jeyu@kernel.org" , "rasmus.villemoes@prevas.dk" , "pbonzini@redhat.com" , "fenghua.yu@intel.com" , "xiaoyao.li@intel.com" , "nadav.amit@gmail.com" , "thellstrom@vmware.com" , "tony.luck@intel.com" , "gregkh@linuxfoundation.org" , "jannh@google.com" , "keescook@chromium.org" , "dcovelli@vmware.com" , "mhiramat@kernel.org" , Wolfgang Mauerer References: <20200407110236.930134290@infradead.org> <20200407111007.429362016@infradead.org> <20200407174824.5e97a597@gandalf.local.home> <137fe245-69f3-080e-5f2b-207cd218f199@siemens.com> <20200408085138.GQ20713@hirez.programming.kicks-ass.net> From: Jan Kiszka Message-ID: Date: Wed, 8 Apr 2020 13:13:17 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08.04.20 11:25, David Laight wrote: > From: Jan Kiszka >> Sent: 08 April 2020 09:59 > ... >> At the risk of cutting our own branch off: That's not the firmware >> loader, it's ioremap with PAGE_KERNEL_EXEC. > > You could link the 'blob' into the .text part of a normal > kernel module and then load that. Sure, also possible. Was just more convenient so far to replace the hypervisor binary without having to recompile the driver module. Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux