From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753953Ab2GYG6R (ORCPT ); Wed, 25 Jul 2012 02:58:17 -0400 Received: from relay.parallels.com ([195.214.232.42]:55386 "EHLO relay.parallels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751062Ab2GYG6Q (ORCPT ); Wed, 25 Jul 2012 02:58:16 -0400 Message-ID: <500F9903.1020208@parallels.com> Date: Wed, 25 Jul 2012 10:58:11 +0400 From: Vladimir Davydov User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.5) Gecko/20120607 Thunderbird/10.0.5 MIME-Version: 1.0 To: "H. Peter Anvin" CC: Borislav Petkov , Andre Przywara , Thomas Gleixner , Ingo Molnar , Andi Kleen , Borislav Petkov , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Andreas Herrmann Subject: Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features References: <73e09fb43e37de851acda10dc64bc495a5b68357.1342801662.git.vdavydov@parallels.com> <20120721103715.GA3632@aftab.osrc.amd.com> <500E4960.8040307@parallels.com> <500E5951.5020900@amd.com> <500E5CDF.5000504@parallels.com> <20120724101041.GA24739@aftab.osrc.amd.com> <500E8280.6050905@parallels.com> <500F4463.9050702@zytor.com> In-Reply-To: <500F4463.9050702@zytor.com> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/25/2012 04:57 AM, H. Peter Anvin wrote: > On 07/24/2012 04:09 AM, Vladimir Davydov wrote: >> We have not encountered this situation in our environments and I hope we >> won't :-) >> >> But look, these CPUID functions cover majority of CPU features, don't >> they? So, most of "normal" apps inside VM will survive migration. >> Perhaps, some low-level utils won't. I guess that's why there are no >> MSRs for other levels provided by vendors. >> > You will once Ivy Bridge becomes common. Ivy Bridge has CPUID faulting, which allows masking all CPUID levels/functions. > -hpa >