[Xen-devel] Re: pv_ops & gntdev?

[Gerd Hoffmann <kraxel@xxxxxxxxxx>]

Jeremy Fitzhardinge wrote:
> Gerd Hoffmann wrote:
>> Gerd Hoffmann wrote:
>>  
>>>> Do you want to bring it over?
>>>>       
>>> Well.  I hoped someone did that already ...
>>>     
>>
>> Ideas how to handle the grant unmap case?
>> I suspect the vm_ops->zap_pte() approach isn't going to fly for mainline
>> merge ...
> 
> 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?

>   2. store the grant handle in the slot corresponding to the pte

ok.

>   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 ...

>   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?

cheers,
  Gerd

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