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Re: [libvirt] [PATCH 8/9] qemu: Update domain status to paused while suspend event is emitted



On 03/11/2012 11:13 PM, Osier Yang wrote:
> On 03/11/2012 10:37 PM, Paolo Bonzini wrote:
>> Il 05/03/2012 11:25, Osier Yang ha scritto:
>>> This introduces a new paused reason VIR_DOMAIN_PAUSED_SUSPEND,
>>> and new suspend event type VIR_DOMAIN_EVENT_SUSPENDED_SUSPEND.
>>>
>>> While a SUSPEND event occurs, the running domain status will be
>>> transferred to "paused" with reason "VIR_DOMAIN_PAUSED_SUSPEND",
>>> and a new domain lifecycle event emitted with type
>>> VIR_DOMAIN_EVENT_SUSPENDED_SUSPEND.
>>> ---
>>
>> Does "virsh resume" correctly wakeup such a domain?
> 
> Ah, yes, I prohibited the situation waking up a domain which
> wasn't paused by SUSPEND event. But here I forgot it.
> 
> If not, perhaps a
>> different state should be added so that "virsh resume" can look at the
>> state and issue the appropriate monitor command (or alternatively, it
>> could be considered a QEMU bug).
> 
> We have the paused reason. And the patch which should be
> squashed in in the attachment.
> 
> But I'm interested in trying if "virsh resume" wakeup a
> domain pasued by SUSPEND event.

It won't.  To wake up a guest in S3 suspension, you need the pmwakeup
command, or else a timer or input device wakeup trigger.  'virsh resume'
only wakes up a paused guest, not a power-management suspended guest.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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