From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: [QEMU PATCH] kvm: support TSC deadline MSR with subsection Date: Thu, 13 Oct 2011 12:13:39 -0300 Message-ID: <20111013151339.GA5039@amt.cnet> References: <20111005195232.GA11292@amt.cnet> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm , Avi Kivity To: "Liu, Jinsong" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:61630 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752448Ab1JMPOw (ORCPT ); Thu, 13 Oct 2011 11:14:52 -0400 Content-Disposition: inline In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On Wed, Oct 12, 2011 at 12:26:12PM +0800, Liu, Jinsong wrote: > Marcelo, > > I just test guest migration from v13 to v12, it failed w/ info > savevm: unsupported version 13 for 'cpu' v12 > load of migration failed > > v13 is new qemu-kvm with tsc deadline timer co-work patch, v12 is old qemu-kvm. You should try the patch in the first message in this thread, which is a replacement for the original tsc deadline timer patch. > > Marcelo Tosatti wrote: > > Jinsong, please test this qemu-kvm patch by migrating a guest which is > > currently using TSC deadline timer. Using subsections avoids breaking > > migration to older qemu versions when the guest does not make use of > > TSC deadline feature. > > > > Is subsection used to avoid breaking migration to older qemu? Yes.