From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andre Przywara Subject: Re: [PATCH] introduce kvm64 CPU Date: Fri, 21 Aug 2009 23:59:39 +0200 Message-ID: <4A8F18CB.6000200@amd.com> References: <1250804057-29681-1-git-send-email-andre.przywara@amd.com> <4A8EC03D.4000202@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Cc: anthony@codemonkey.ws, qemu-devel@nongnu.org, kvm@vger.kernel.org, jamie@shareable.org To: Avi Kivity Return-path: Received: from va3ehsobe005.messaging.microsoft.com ([216.32.180.15]:4204 "EHLO VA3EHSOBE005.bigfish.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932396AbZHUV4x (ORCPT ); Fri, 21 Aug 2009 17:56:53 -0400 In-Reply-To: <4A8EC03D.4000202@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity wrote: > On 08/21/2009 12:34 AM, Andre Przywara wrote: >> In addition to the TCG based qemu64 type let's introduce a kvm64 CPU >> type, >> which is the least common denominator of all KVM-capable x86-CPUs >> (based on Intel Pentium 4 Prescott). It can be used as a base type >> for migration. >> > Typically users will want more specialized greatest common denomiator > cpu types; if a site has standardized on recent hardware they will want > the features of that hardware exposed. Sure, but this was not the purpose of this patch. Currently KVM guests see a CPU type which is TCG dependent, so I just wanted to get rid of this. Features of TCG and features of the host processor are totally uncorrelated. This new type should be KVM's default, leaving -cpu host as the alternative for the non-migration case. > I think this is best left to management software, which has more > information about the migration pool. Sure. Regards, Andre. -- Andre Przywara AMD-Operating System Research Center (OSRC), Dresden, Germany Tel: +49 351 488-3567-12 ----to satisfy European Law for business letters: Advanced Micro Devices GmbH Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen Geschaeftsfuehrer: Jochen Polster; Thomas M. McCoy; Giuliano Meroni Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen Registergericht Muenchen, HRB Nr. 43632