Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752961AbZGWKez (ORCPT ); Thu, 23 Jul 2009 06:34:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752046AbZGWKez (ORCPT ); Thu, 23 Jul 2009 06:34:55 -0400 Received: from outbound-dub.frontbridge.com ([213.199.154.16]:10588 "EHLO IE1EHSOBE005.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751141AbZGWKey (ORCPT ); Thu, 23 Jul 2009 06:34:54 -0400 X-SpamScore: -27 X-BigFish: VPS-27(zz1432R98dNaf6Wzz1202hzzz32i6bh1f9i43j64h) X-Spam-TCS-SCL: 3:0 X-WSS-ID: 0KN8DDW-03-9MR-01 Message-ID: <4A683CC0.90509@amd.com> Date: Thu, 23 Jul 2009 12:34:40 +0200 From: Andre Przywara User-Agent: Thunderbird 2.0.0.14 (X11/20080508) MIME-Version: 1.0 To: Michael Tokarev CC: Linux-kernel , KVM list Subject: Re: This combination of AMDprocessors is not suitable for SMP? References: <4A6816AD.2060700@msgid.tls.msk.ru> In-Reply-To: <4A6816AD.2060700@msgid.tls.msk.ru> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 23 Jul 2009 10:34:42.0173 (UTC) FILETIME=[3040F2D0:01CA0B81] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1527 Lines: 40 Michael Tokarev wrote: > (yes there's no typo in $subject, it's an old formatting > bug in printk). > > When booting kvm guest on an AMD CPU, guest kernel prints > this warning: > > WARNING: This combination of AMDprocessors is not suitable for SMP. > > be it SMP or UP guest. What's wrong with this "combination", > and can it be fixed? The qemu64 CPU model KVM injects into the guest lets it see an AMD K7 with 64bit extension. Only some AMD K7 (Athlon-MP) were certified for SMP support, so this code warns the user about an unsupported hardware. When running KVM you can ignore this warning, as it only applies to non-KVM capable processors and has no meaning for virtual SMP anyway. If you like this warning to disappear, you can use "-cpu host" (and probably loose migration capability) or wait for the new safe64 CPU type, which will use family 15 instead of 6. Regards, Andre. -- Andre Przywara AMD-Operating System Research Center (OSRC), Dresden, Germany Tel: +49 351 448 3567 12 ----to satisfy European Law for business letters: Advanced Micro Devices GmbH Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen Geschaeftsfuehrer: Thomas M. McCoy; Giuliano Meroni Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen Registergericht Muenchen, HRB Nr. 43632 -- 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/