Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754047AbYJARt6 (ORCPT ); Wed, 1 Oct 2008 13:49:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752571AbYJARtt (ORCPT ); Wed, 1 Oct 2008 13:49:49 -0400 Received: from terminus.zytor.com ([198.137.202.10]:35564 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752502AbYJARts (ORCPT ); Wed, 1 Oct 2008 13:49:48 -0400 Message-ID: <48E3B753.7000309@zytor.com> Date: Wed, 01 Oct 2008 10:45:55 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: akataria@vmware.com CC: Jeremy Fitzhardinge , "avi@redhat.com" , Rusty Russell , Gerd Hoffmann , Ingo Molnar , the arch/x86 maintainers , LKML , "Nakajima, Jun" , Daniel Hecht , Zach Amsden , "virtualization@lists.linux-foundation.org" , "kvm@vger.kernel.org" Subject: Re: [RFC] CPUID usage for interaction between Hypervisors and Linux. References: <1222881242.9381.17.camel@alok-dev1> <48E3B19D.6060905@zytor.com> <1222882431.9381.23.camel@alok-dev1> In-Reply-To: <1222882431.9381.23.camel@alok-dev1> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 913 Lines: 25 Alok Kataria wrote: > > Hi Peter, > > Its not a user who has to do anything special here. > There are *intelligent* VM developers out there who can export a > different CPUid interface depending on the guest OS type. And this is > what most of the hypervisors do (not necessarily for CPUID, but for > other things right now). > It doesn't matter, really; it's still the wrong thing to do, for the same reason it's the wrong thing in -- for example -- ACPI, which has similar "cleverness". If we want to have a "Linux standard CPUID interface" suite we should just put them on a different set of numbers and let a hypervisor export all the interfaces. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/