[Xen-research] When to emulate_memop() and when to do_update_va_mapping()

["Tom Creck" <tom-xen@xxxxxxxxxxx>]

Hello, everyone:

 

         I know that x86_emulate_memop() is used to emulate writing to page table pages as Xen intentionally write protect page table pages.

         Also, the hypercall Hypervisor_update_va_mapping() -> mod_l2/l1_entry() is also used to modify page table pages.

         So I get confused about their difference. My questions are:

 

(1)     When are the above two routines of modifying page table pages invoked respectively?

(2)     What’s the difference in functionality among the two?

 

Best Wishes

Tom

 

 

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