From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: pv_ops & gntdev?
Date: Wed, 25 Feb 2009 19:56:19 +0100
Message-ID: <49A59453.1090502@redhat.com>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
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Jeremy Fitzhardinge wrote:
>> 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)
>   2. store the grant handle in the slot corresponding to the pt
>   3. when clearing the pte, check to see if there's a grant handle and
>      zap it
>   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

Also: 2.6.18 gntdev does some funky interaction with the balloon driver.
 What is the point in doing so?

thanks,
  Gerd