From: Dor Laor Subject: Re: [Qemu-devel] cpuid problem in upstream qemu with kvm Date: Thu, 07 Jan 2010 14:20:00 +0200 Message-ID: <4B45D170.7050000@redhat.com> References: <4B30EFDF.4060202@codemonkey.ws> <4B31F1BA.10005@redhat.com> <4B43D4E2.9050102@codemonkey.ws> <4B4402B1.1030605@redhat.com> <4B448F36.8030605@codemonkey.ws> <4B449467.4070606@redhat.com> <4B4494FC.1080907@codemonkey.ws> <4B449608.7040102@redhat.com> <4B4496E9.2030201@redhat.com> <20100106142231.GF2248@redhat.com> <4B449EE7.4050401@redhat.com> <4B44A2C6.4050504@redhat.com> <4B44A965.9040300@codemonkey.ws> <4B459550.6000202@redhat.com> <4B4598BC.4000206@redhat.com> <4B45A536.1070300@redhat.com> <4B45A851.5000401@redhat.com> <4B45AC18.8040003@redhat.com> <4B45C7EB.1010501@codemonkey.ws> <4B45C90C.1000507@redhat.com> <4B45CCCE.1010208@redhat.com> Reply-To: dlaor@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Anthony Liguori , kvm-devel , Gleb Natapov , "Michael S. Tsirkin" , John Cooper , Alexander Graf , qemu-devel@nongnu.org To: Avi Kivity Return-path: Received: from mx1.redhat.com ([209.132.183.28]:37827 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750781Ab0AGMTr (ORCPT ); Thu, 7 Jan 2010 07:19:47 -0500 In-Reply-To: <4B45CCCE.1010208@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 01/07/2010 02:00 PM, Avi Kivity wrote: > On 01/07/2010 01:44 PM, Dor Laor wrote: >>> So if you had a 2.6.18 kernel and a 2.6.33 kernel, it may be necessary >>> to say: >>> >>> (2.6.33) qemu -cpu Nehalem,-syscall >>> (2.6.18) qemu -cpu Nehalem >> >> >> Or let qemu do it automatically for you. > > qemu on 2.6.33 doesn't know that you're running qemu on 2.6.18 on > another node. > We can live with it, either have qemu realize the kernel version out of another existing feature or query uname. Alternatively, the matching libvirt package can be the one adding or removing it in the right distribution.