[Qemu-devel] Re: [PATCH alternative] fix migration to obey -S

[Anthony Liguori]

Glauber Costa wrote:
> On Mon, Jul 27, 2009 at 04:36:53PM -0500, Anthony Liguori wrote:
>   
> > Glauber Costa wrote:
> >     
> > > Hummm,, those are a little bit weird. I'd expect it to be a characteristic of 
> > > the
> > > source machine, no the destination. IOW, if the machine was running prior to 
> > > migration,
> > > it should be running after it, and if it was stopped prior to migration, it 
> > > should be
> > > stopped after it.
> > >   
> > >       
> > Whether a guest is running is not part of it's state-IOW, it's not  
> > visible to the guest whether it's running or not.
> >     
> Can't we then register a savevm function for that?
>   

No, that's the point.  Since it's not guest visible, it should not be 
saved as part of savevm.

It's up to the management tools to keep track of whether a VM is stopped 
or not.  When creating the destination node, the user specify whether 
they want the VM to be stopped.

So qemu -incoming ... -S

Should translate to: do not automatically run the VM after migration.

qemu -incoming ...

Will always run the VM after migration regardless of whether the VM was 
migrated while stopped.

--
Regards,

Anthony Liguori