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Date: Fri, 19 Dec 2014 12:32:52 +0100
From: Igor Mammedov <imammedo@redhat.com>
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Subject: Re: [Qemu-devel] broken backward migration due to commit 461a275
 "parallel: adding vmstate for save/restore"
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: dgilbert@redhat.com, qemu-devel@nongnu.org, Pavel.Dovgaluk@ispras.ru, quintela@redhat.com

On Fri, 19 Dec 2014 12:15:20 +0100
Paolo Bonzini <pbonzini@redhat.com> wrote:

> 
> 
> On 19/12/2014 12:03, Igor Mammedov wrote:
> > steps to reproduce:
> > 
> > Current master source:
> > qemu-system-x86_64 -monitor stdio -M pc-i440fx-2.1
> > (qemu) stop
> > (qemu) migrate "exec:gzip -c > STATEFILE.gz"
> > 
> > Target:
> >   qemu-system-x86_64-2.1 -monitor stdio -M pc-i440fx-2.1 -incoming "exec: gzip -c -d STATEFILE.gz"
> > 
> 
> That's expected.  Backwards migration is not supported by upstream, and
> there's no equivalent of subsections for entire devices.
> 
> Just use "-parallel none".
ok

There is one more commit that breaks it, this time with subsection
6c3bff0 "exec: Save CPUState::exception_index field"

qemu: warning: error while loading state for instance 0x0 of device 'cpu_common'
the same reproducer with -parallel none

> 
> Paolo