Vol. 3C 30-5

VMX INSTRUCTION REFERENCE

#UD

If not in VMX operation.
If the logical processor does not support EPT (IA32_VMX_PROCBASED_CTLS2[33]=0).
If the logical processor supports EPT (IA32_VMX_PROCBASED_CTLS2[33]=1) but does not 

support the INVEPT instruction (IA32_VMX_EPT_VPID_CAP[20]=0).