Re: [Qemu-devel] Re: new->old version migration

[Anthony Liguori]

On 02/08/2011 01:07 AM, Amit Shah wrote:
> On (Tue) 08 Feb 2011 [08:42:14], Michael S. Tsirkin wrote:
>    
> > I see. I'm unhappy with the facts that
> > 1. if (feature) is spread all over the code instead
> >     of just in migration
> > 2. it is also obfuscated with if (flow_control)
> >     instead of plain if (migrate to qemu<  0.14)
> >     so removing it will be much harder
> > 3. this forces anyone who wants
> >     a VM compatible with qemu 0.13 to also lose data,
> >     even if migration to 0.13 is never attempted.
> >      
> If a machine is started with -M pc-0.13 then we can safely assume the
> user will want to migrate to another 0.13 machine.
>    

No, a user wants a guest that works.  If there was a bug in 0.13 and 
it's fixed in 0.14, then reintroducing the bug in -M pc-0.13 is not 
expected.

Regards,

Anthony Liguori