Some questions about nested EPT

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Hi there,

When I test nested EPT (enable EPT of L2->L1 address translation), it
occurred some questions when query IA32_VMX_EPT_VPID_CAP.

1. It show that bit 16 and 17 (support for 1G and 2M page) are
disabled in nested IA32_VMX_EPT_VPID_CAP. Why nested EPT fails to
support these? Are there any difficulties?

2. Can the bit 6 (support for a page-walk length of 4) of
IA32_VMX_EPT_VPID_CAP is 0? That is to say if I can design a paging
structure >4 or <4 levels?

Cause I don't know who is the original author of nested EPT, I send
this mail to the whole list. If anyone knows please tell me and CC the
authors for more detailed discussion.

Thanks,
Arthur

-- 
Arthur Chunqi Li
Department of Computer Science
School of EECS
Peking University
Beijing, China
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