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[Xen-devel] Quick Questions about page fault?

Hi everyone,
         I want to know more about page fault. How does Xen handle
page fault in both PV and HVM?
         Which function will Xen call?   What is the difference?
         I assume that Xen will notify Guest OS about the page fault
only when it needs to?
         But I change the do_page_fault() and remove the some pages' _PAGE_RW.
         I also add some code to restore the _PAGE_RW in the
do_page_fault. If the error_code is 0, do_page_fault returen?
         But I get some error somehow?
         Can anyone tell me more about Xen's page fault routine? Thank
U for answering.

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