From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1Mec6W-0000D9-OM for qemu-devel@nongnu.org; Fri, 21 Aug 2009 17:57:00 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1Mec6R-0000Ce-OS for qemu-devel@nongnu.org; Fri, 21 Aug 2009 17:57:00 -0400 Received: from [199.232.76.173] (port=54480 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Mec6R-0000Cb-Ln for qemu-devel@nongnu.org; Fri, 21 Aug 2009 17:56:55 -0400 Received: from va3ehsobe005.messaging.microsoft.com ([216.32.180.15]:4196 helo=VA3EHSOBE005.bigfish.com) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_ARCFOUR_MD5:16) (Exim 4.60) (envelope-from ) id 1Mec6R-0000mh-7I for qemu-devel@nongnu.org; Fri, 21 Aug 2009 17:56:55 -0400 Message-ID: <4A8F18CB.6000200@amd.com> Date: Fri, 21 Aug 2009 23:59:39 +0200 From: Andre Przywara MIME-Version: 1.0 References: <1250804057-29681-1-git-send-email-andre.przywara@amd.com> <4A8EC03D.4000202@redhat.com> In-Reply-To: <4A8EC03D.4000202@redhat.com> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Re: [PATCH] introduce kvm64 CPU List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org 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