Re: [Xen-devel] foreign mapping destructor

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 2 Dec 2005, at 00:54, King, Steven R wrote:

> The SetPageForeign() macro takes a pointer to a destructor function.
> Can someone please explain the responsibilities of this destructor?
> Thanks for your time,
The 'Foreign' in this context is supposed to refer to a foreign heap. 
That is, the page was not originally allocated from page_alloc.c. So 
the destructor is entirely responsible for cleaning up that page of 
memory (e.g., in netback.c it unmaps a domU page and sends a 
packet-transmitted response to the domU netfront driver). After calling 
the destructore, page_alloc.c will not touch that page any more (it 
will immediately bail).
 -- Keir


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