[Xen-devel] Re: pv_ops & gntdev?

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> > Yes, my plan is:
> >
> >   1. when installing a grant in a pte page, allocate a shadow page and
> >      hang it off page->private; also set a page flag on the pgd page
> >      flags (steal something spare)
> >     
> pgd or pte page flags?  or both?
>   
Just pgd, so that the unpinner can see it needs to make a second pass.  
At the pte level, looking for a non-NULL page->private should be enough.
> >   3. when clearing the pte, check to see if there's a grant handle and
> >      zap it
> >     
> That needs a new paravirt hook I think ...
>   
Hm, I hope not.  Doesn't it always end up using set_pte*?

> >   4. when unpinning the pagetable, check to see if there's the "grant
> >      mapping" flag in the pgd, and do a grant-zap pass before unpinning
> >     
> ok.
>
> Prelimary patches by chance?
>   
No, I haven't got around to implementing this at all.

Thanks,
   J

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