Re: [libvirt] [PATCH v2 4/5] qemu: Wire up virDomainSuspendForDuration API

On 01/26/2012 12:59 PM, Michal Privoznik wrote: Same question as for quiesce: putting the guest into S3 will only work if the agent can respond, so checking merely for active is not enough. If the guest is active but paused, then we can't talk to the agent to issue the request. Having the common guest agent code check for this condition will prevent the scenario of: guest is paused issue the pm suspend, but it times out guest is resumed guest finally acts on command although it is always possible that a guest will suspend itself even without action on our part. At least this isn't as bad as a stale quiesce leaving the guest in a bad state, since on suspend, the host will receive a qemu event about the change in guest state (there's no event for freeze/thaw, since that is an aspect internal to the guest's use of disks and not something inherently visible to qemu to generate an event from). -- Eric Blake eblake(a)redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org