From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Live Migration of 32-bit Linux guest broken since 2.6.35-rc2 Date: Tue, 08 Jun 2010 16:40:29 +0300 Message-ID: <4C0E484D.4060609@redhat.com> References: <215BBDE4-B30E-4E55-8AC7-3B7C25662FAC@dlh.net> <4C0E09C0.9060300@dlh.net> <4C0E29B6.7060302@redhat.com> <4C0E2A1E.6080609@redhat.com> <4C0E2ECC.5090806@redhat.com> <4C0E3C46.30901@dlh.net> <4C0E3CD5.4070202@redhat.com> <4C0E4576.8030609@dlh.net> <4C0E46ED.5030305@redhat.com> <4C0E47C3.1050409@dlh.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org To: Peter Lieven Return-path: Received: from mx1.redhat.com ([209.132.183.28]:44413 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754912Ab0FHNkf (ORCPT ); Tue, 8 Jun 2010 09:40:35 -0400 In-Reply-To: <4C0E47C3.1050409@dlh.net> Sender: kvm-owner@vger.kernel.org List-ID: On 06/08/2010 04:38 PM, Peter Lieven wrote: > Avi Kivity wrote: >> On 06/08/2010 04:28 PM, Peter Lieven wrote: >>>> >>>>> i will retry the case later today and send info register output. >>>>> what is the recommended value for nx (and why)? >>>> >>>> Enabled (so you get no-execute memory protection). >>> >>> do you have a guideline which flags should be identical to ensure >>> proper live migration? >>> i would like to do an automatic compare before life migration to >>> avoid crashes. >> >> All of them [1]. If you have an asymmetric machine, you can disable >> those flags with the -cpu switch. >> >> Note the default qemu cpu disables many flags, so if one machine has >> sse4.2 and the other doesn't, migration will still work without >> disabling anything. > which cpu model do you suggest for 4 core xeon cpus? -cpu host ? -cpu host is good if you have identical machines and don't plan to add new ones. > how important is the match of the virtualization extensions? The virtualization extensions on Intel aren't exposed to the guest, so they don't need to match. -- error compiling committee.c: too many arguments to function