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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 B3FB8C433E0 for ; Wed, 20 May 2020 00:18:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7F9FC207E8 for ; Wed, 20 May 2020 00:18:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="HamYMkz3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728085AbgETASR (ORCPT ); Tue, 19 May 2020 20:18:17 -0400 Received: from terminus.zytor.com ([198.137.202.136]:51569 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726344AbgETASR (ORCPT ); Tue, 19 May 2020 20:18:17 -0400 Received: from carbon-x1.hos.anvin.org ([IPv6:2601:646:8600:3281:e7ea:4585:74bd:2ff0]) (authenticated bits=0) by mail.zytor.com (8.15.2/8.15.2) with ESMTPSA id 04K0HX411072698 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO); Tue, 19 May 2020 17:17:33 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 04K0HX411072698 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2020042201; t=1589933856; bh=pzjrg1D/87oLc0VRBPeM1/XkcV73EGEp+ELgwdVZVik=; h=Subject:To:References:From:Date:In-Reply-To:From; b=HamYMkz3aUvFBEnxHScelDoTxhchPW7LGv+blgvuTMUZVHDmfDUv74AYIKJI1ro2U zN+/K51Q17cFwmQLfzLD7zRXP9AjXocPMLKEOHOd7J4FzTsh7jwvFW7Dqn8palb7MG TdUZwiPmdwe4+E/nU0giQjER5XaBj/4d+oMLzWvXHzqB8qBb9fummM1+e8tRhdMyxW YJ17NbiV9peJ65dgDAc4nBLI2/x7cVg+Rxr2LLSIcUZHbIU1YHLLKar9DgJOSTqJCI 8oicAFRP/wJDM3D0mFa476rRb3O1H9XLiyGVwljcOIGeK8U1NSNMSTEV8Zpfar9COU AN1hLUSkxgemg== Subject: Re: umip: AMD Ryzen 3900X, pagefault after emulate SLDT/SIDT instruction To: Andreas Rammhold , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, Ricardo Neri , "Eric W. Biederman" , Sergey Senozhatsky , Babu Moger , Kefeng Wang , Jason Yan , Brendan Shanks , linux-kernel@vger.kernel.org References: <20200519143815.cpsd2xfx2kl3khsq@wrt> From: "H. Peter Anvin" Message-ID: Date: Tue, 19 May 2020 17:17:28 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200519143815.cpsd2xfx2kl3khsq@wrt> Content-Type: text/plain; charset=utf-8 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 2020-05-19 07:38, Andreas Rammhold wrote: > Hi, > > I've been running into a weird problem with UMIP on a current Ryzen > 3900x with kernel 5.6.11 where a process receives a page fault after the > kernel handled the SLDT (or SIDT) instruction (emulation). > > The program I am running is run through WINE in 32bit mode and tries to > figure out if it is running in a VMWare machine by comparing the results > of SLDT against well known constants (basically as shown in the > [example] linked below). > Extremely weird. What is it expecting to happen -- or rather, what do you *want* it to do? -hpa