Re: [Xen-devel] shutdown question - PV vs HVM

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

For a PV guest, a shutdown node is written into xenstore which the guest
picks up. The guest will then usually initiate a clean shutdown.

The same happens for an HVM guest with PV drivers installed. If an HVM guest
has no PV drivers (And so will obviously not be watching xenstore) then xend
notifies the shutdown immediately to Xen. This causes Xen to immediately
transition the guest to shutdown state, and no longer execute the guest,
with no chance for clean shutdown. If there are no PV drivers installed,
clean shutdown needs to be initiated from within the guest.

 -- Keir

On 1/10/07 02:13, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> I've had a bit of a look through the code but can't seem to find the
> answer to this question... what is the method by which 'xm' tells a
> domain to shutdown?
> 
> What is different about HVM that means it just powers straight off?
> 
> Looking at the Linux source, it appears that something is done with
> 'platform-feature-multiprocessor-suspend' in the store, but it isn't
> clear to me what...
> 
> Thanks
> 
> James
> 
> 
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