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: Wed, 09 Jun 2010 18:08:23 +0300 Message-ID: <4C0FAE67.3010002@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> <4C0E484D.4060609@redhat.com> <4C0E492F.6060203@dlh.net> <4C0E495C.8020008@redhat.com> <4C0F50ED.7060109@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]:39007 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756082Ab0FIPIa (ORCPT ); Wed, 9 Jun 2010 11:08:30 -0400 In-Reply-To: <4C0F50ED.7060109@dlh.net> Sender: kvm-owner@vger.kernel.org List-ID: On 06/09/2010 11:29 AM, Peter Lieven wrote: > Avi Kivity wrote: >> On 06/08/2010 04:44 PM, Peter Lieven wrote: >>>> -cpu host is good if you have identical machines and don't plan to >>>> add new ones. >>> >>> i will likely add new ones, but my plan would be to use qemu64 and >>> then add all flags manually that >>> are common to all cpus in the pool. >>> would that be safe? >> >> Yes. >> > 2 last questions: > > a) i remember that there (have been) are instructions that have a high > virtualization penalty. > are there flags that should better not be offered to a VM? Not that I know of. > b) you told you fixed another bug in 2.6.35. is the nx virtualization > not working in guests > before 2.6.35 and therefore my case worked with 2.6.34? On 2.6.34, your guest lost nx protection after migration. On 2.6.35, it died. -- error compiling committee.c: too many arguments to function