Re: [Qemu-devel] broken backward migration due to commit 461a275 "parallel: adding vmstate for save/restore"

[Igor Mammedov]

On Fri, 19 Dec 2014 12:32:52 +0100
Igor Mammedov <address@hidden> wrote:

> On Fri, 19 Dec 2014 12:15:20 +0100
> Paolo Bonzini <address@hidden> 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
correction this time it's with -M pc-i440fx-1.7 and target qemu-1.7

> 
> > 
> > Paolo
> 
>