[Xen-devel] Re: pv_ops & gntdev?

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> Jeremy Fitzhardinge wrote:
>   
> > Gerd Hoffmann wrote:
> >     
> > > Also: 2.6.18 gntdev does some funky interaction with the balloon driver.
> > >  What is the point in doing so?
> > >   
> > >       
> > Oh, the alloc_empty_pages_and_pagevec() stuff?  It allocates some pages,
> > just for their pfn slots, and then returns the underlying memory back to
> > Xen.  It uses the pfns to slot granted pages into.
> >     
> Yep, gives pfn slot for the grant map.  And a struct page too.
>
> /me wonderes whenever that is required or whenever I could just map the
> grants without asking the balloon driver for some slots ...
>   
I think they could be special ptes now, and not need any struct page.

   J

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