Finding EPT entries for nested guest in L0

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I have 2 questions.

1. In nested VMs that use multi-dimensional page tables( EPT on EPT)
where exactly in the code are EPT ( 0 -> 2) entries constructed? I can
know from the Turtles paper that these entries are created by
combining EPT 1->2 and EPT 0->1. But I can find that in KVM code.

2. Are there rmap entries for EPT 0->2 pages maintained? I am trying
to write protect nested guest GFN's directly in L0 ( without letting
L1 do it) but I don't know how to find the EPT 0->2  entry for a given
L2 guest GFN.

regards,
Rohith
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