[libvirt] domain shutdown requests

[shu ming]

 From the real physical usage case, the user can not shutdown a 
suspended OS before the OS is resumed.
That is what Linux and Windows does now.  And the user will get a 
interactive pop-up window before the request is confirmed.  So in 
virtualized enviroment, it is better to resume the guest OS first.  
However, whether to shutdown the OS directly after resume or requiring a 
second shutdown is arguable.

Christian Benvenuti (benve):
> When you shutdown a domain that is in PAUSED state, the shutdown will
> not
> take effect until you issue a resume cmd:
>
> # virsh suspend<domain_name>
>
>    <domain_name>  is now PAUSED
>
> # virsh shutdown<domain_name>
>
>    <domain_name>  does not shutdown, with the reason being that, for
>    example in the case of a Linux Guest, the guest is not running and
>    therefore there is no acpid running and able to process the shutdown
>    request. Right?
>
> If now we issue a resume
>
> #virsh resume<domain_name>
>
>    the guest initiates the (pending) shutdown (ie, acpid processes the
>    pending request).
>
> Is this the expected behavior?
>
> Shouldn't virsh do something like this when it issues a shutdown
> request?
>
>    if (domain.state == PAUSED)
>      resume(domain)
>
>    shutdown(domain)
>
> If yes, then I guess this logic should go
> - into the cmdShutdown routine if we want to make it available to virsh
> only,
> or
> - inside the driver's domainShutdown fn if we want to make it available
> to any
>    libvirt user.
>
> One more minor comment.
> As of now, "virsh list" (or 'virsh domstate<domain>') does not provide
> any way of
> knowing if
> - a domain is being shutdown
> or
> - a domain has a pending shutdown request (like in the example above).
>
> Would it make any sense to enhance the output of list/domstate , for
> example to
> show something like this when libvirt issues a shutdown to a running
> domain
>
>   Id Name                 State
> ----------------------------------
>    3 FC15-2               running (shutdown in progress)
>
> Or something like this when it issues a shutdown to a PAUSED domain?
>
> Id Name                 State
> ----------------------------------
>    3 FC15-2               PAUSED (shutdown request pending)
>
> Thanks
> /Chris
>
>
>
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