Re: [Xen-devel] Re: Reg domU shutdown

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

On Friday 11 July 2008, Sandesh wrote:
> > I also looked at the xen drivers in domU kernel source. There i found
> > cpu_die func in drivers/xen/core/smpboot.c and am assuming this might be
> > the one invoked for shuting down domU.
>
> i think shutdown_handler of drivers/xen/core/reboot.c is used to
> terminate the guest. I want to know what mechanism is used to invoke
> it??
>  I see that it is setup as a watch function on xenbus. But how is it
> triggered??
> Please tell me if my understanding is correct.

I think you've got the right idea.

When you use the xm command, it talks to Xend in dom0 to instruct it to 
perform the appropriate management tasks.

The shutdown is then initiated by Xend in dom0 writing to Xenstore.  The 
Xenbus driver (the Linux interface to Xenstore) picks up this modification to 
Xenstore and forwards it on to the registered watcher, resulting in 
shutdown_handler() being called in reboot.c.  This in turn causes a userspace 
program to be run to initiate a clean domain shutdown.

Hope that helps.

Cheers,
Mark

Cheers,
Mark

-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

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