Re: [Xen-devel] What actually destroys a domain?

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

On Sep 13, 2006, at 8:15 AM, Keir Fraser wrote:

> On 13/9/06 10:23, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> wrote:
>
> > > > Xenconsoled's mapping of the console page should keep the domain
> > > > alive.
> > > hmm, I'm having trouble associating the "mapping" and a refcount of
> > > some sort somewhere, any pointers?
> > See share_xen_page_with_guest() in arch/x86/mm.c. The refcnt is  
> > dropped when
> > xenheap_pages field reduces to zero in
> > common/page_alloc.c:free_domheap_pages().
> Sorry, I'm talking rubbish here. As you say, the relevant code is  
> actually
> in the foreign mapping paths (e.g., in arch/x86/mm.c). Those paths  
> do a
> get_page() on the foreign page. This stops it being removed from  
> the domU
> page list. A non-empty page list holds a reference on the domU. So  
> the domU
> will not die until that foreign mapping is destroyed.
Whew!

-JX

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