[Xen-research] Changing EPT Level to 4?

[Oliver Conde <oliverconde4@xxxxxxxxx>]

Hi all

I am experimenting with Xen and I tried to change the EPT level from 3 to 4.
so in xen/include/asm-x86/hvm/vmx/vmcs.h I changed the value of ept_wl from 3 to 4.

Unfortunately Windows 7 can no longer boot with the change.

Is this expected? 
What could be the problem?
Is there a workaround for this?

I would be willing to invest some time coding a fix for this, without pointers or hints though it might take a lot longer though...

Thanks in advance and kind regards,
Oliver
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