Xen devel - Nov 2008 - Source code of DomU/Dom0 context switch resulting from writing DomU''s PTE?

Hi:
 
>From some of my test I learn that when a DomU modifies its page table entry
(PTE), then a context switch should happen to sync the guest page table (GPT)
and shadow page table (SPT). I want to learn this part of codes, so could any
one here tell me how I can find these codes? I mean codes aiming at: Updating
guest PTE --> DomU/Dom0 context switch-->sync PTs
 
Thanks!
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