Re: [Xen-devel] [PATCH 4/6] x86/NPT: don't walk entire page tables when changing types on a range

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 04/17/2014 11:46 AM, Jan Beulich wrote:
> This builds on the fact that in order for no NPF VM exit to occur,
> _PAGE_USER must always be set. I.e. by clearing the flag we can force a
> VM exit allowing us to do similar lazy type changes as on EPT.
>
> That way, the generic entry-wise code can go away, and we could remove
> the range restriction in enforced on HVMOP_track_dirty_vram for XSA-27.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
I am not particularly familiar with p2m code which is why my only 
comment so far is to add comments in the code ;-) --- there is a bunch 
of new non-trivial (to my eye) routines and so having a little bit of 
text would greatly help with understanding the logic.
-boris


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