Overshadow: A Virtualization-Based Approach to Retrofitting Protection in Commodity Operating Systems

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"Overshadow: A Virtualization-Based Approach to Retrofitting Protection in Commodity Operating Systems"
 by Xiaoxin Chen, Tal Garfinkel, E. Christopher Lewis, Pratap Subrahmanyam, Carl A. Waldspurger, 
Dan Boneh, Jeffrey Dwoskin, and Dan R. K. Ports. 
In Proceedings of the 13th International Conference on Architectural Support for 
Programming Languages and Operating Systems (ASPLOS '08), (Seattle, WA, USA), Mar. 2008.

SACSISで大山さんの学生さんの発表で触れられていた論文．VM上のOSとアプリケーションとに対して別のメモリイメージを見せる，という話．何かが違うという主張だったが，何が違うんだったか?