On Fri, 19 Feb 2016 15:41:10 +0100 Laurent Vivier <lviv...@redhat.com> wrote:
> On 18/02/2016 12:32, Greg Kurz wrote: > > QEMU 2.4 broke the migration of old pseries machine with the addition > > of configuration sections, which are sent unconditionally. > > > > We assume that QEMU 2.3 is more deployed than any newer release (based on > > the versions currently shipped by most distros). This v3 series hence > > reverses the logic from v2: it now fully fixes migration of old pseries > > from/to QEMU 2.3 and provides a manual workaround for the QEMU 2.4/2.4.1/2.5 > > case. > > > > With this series, I could migrate the same pseries-2.3 instance in a full > > 2.3->2.6->2.5->2.6->2.4->2.6->2.3 cycle. > > I've tested all possible combinations, with and without these patches. > The result is here: > > http://wiki.qemu.org/Migration/Compatibility/pseries > Excellent ! Thanks for setting this up. > - Migration is totally broken in qemu-2.2 Hmm... I get another error with qemu-2.2: htab_load() bad index -65536 (0+8454 entries) in htab stream (htab_shift=26) qemu: warning: error while loading state section id 20 qemu-system-ppc64: load of migration failed: Invalid argument but my command line is different from yours. > - without these patches, migration cannot be done from/to qemu-2.3 > - with these patches, qemu-2.3 can migrate to/from qemu-2.6 > - 1st patch breaks pseries-2.2, pseries-2.3 migration from/to > qemu-2.4/2.5 but 2nd patch allows to fix this manually. > > Feel free to update the page. > > Laurent >
