Page Table Structure Corruption Attacks - How to Mitigate it?

On x86 and many other processor architectures (with MMU), page tables are critical data structures for address translations. And many hardware-based page level protection technologies in my previous post, like SMEP, XD/DEP, highly depend on correct page table settings. so what if page tables are controlled by an attacker? ...At the end of this post, I will propose an extra solution to mitigate page table structure attacks.