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

[Anthony Liguori <aliguori@us.ibm.com>]

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