Re: [Qemu-devel] wake-on-lan & IPMI implementation; real power-off and -no-shutdown

[Anthony Liguori <anthony@codemonkey.ws>]

On 03/15/2010 10:37 AM, François Revol wrote:
> Le Mon, 15 Mar 2010 15:26:24 +0000, Paul Brook a écrit :
>    
>>> Ideally this would evolve into supporting IPMI, which would allow
>>> managing VMs exactly like physical servers without concern, appart
>>> launching the actual process first.
>>> cf.
>>> http://en.wikipedia.org/wiki/Intelligent_Platform_Management_Interface
>>>        
>>>>> http://openipmi.sourceforge.net/
>>>>>            
>>> Anyone interested in this ?
>>> Anyone tried already ?
>>>        
>> TBH I don't really see the point.
>>
>> This definitely seems like something that should be handled by your
>> your
>> mangement app (via libvirt, or whatever). i.e. have that implement
>> whatever
>> remote protocol you want, and just talk to qemu over the normal
>> monitor
>> interface.
>>      
> Hmm for IPMI that might probably indeed be a better way, moreover since
> they use a parallel subnet on the primary ethernet card...
> Though it would require the implementation to listen to the same
> virtual card, which are mapped differently to the host depending on the
> VM (-net user, ...).
>
> As for WOL, it would still be handy to have I think... btw, do we
> support suspending the emulation via ACPI ? VirtualBox has something
> called "Pause" mode, which I'm not sure actually if it's reflected to
> ACPI, which allows to avoid wasting cpu when not usign the guest,
> though it requires support from the Guest Additions to avoid clock
> drifts.
>    

It's just "stop".

It won't cause time drift in qemu when using pvclock but you will get 
soft lockups in Linux.  I presume you get that with Virtual Box too.

Regards,

Anthony Liguori

> François.
>
>
>