Multi-dimensional Paging in Nested virtualization

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I read turtles project paper where they have explained  how
multi-dimensional page tables are built on L0. L2 is launched with
empty EPT 0->2 and EPT 0->2 is built on-the-fly.
I tried to find out how this is done in kvm code but i could not find
where EPT 0->2 is built.
Does L1 handle ept violation first and then L0 updates its EPT0->2?
How this is done?

Can anybody give me some pointers about where to look into the code?

Thanks
Siddhesh
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