1. In a computer system comprising a host hardware platform, virtualization software running on the host hardware platform, and a virtual machine running on the virtualization software, a method for tracking data correspondences which comprises: monitoring one or more data movement operations of the computer system; and storing information regarding the data movement operations in a data correspondence structure, the information for each of the data movement operations including data correspondence information between a data location in a virtual memory of the virtual machine and a data location in a physical component that is accessible by the computer system; wherein monitoring comprises monitoring data movement at one or more of an interface between the host hardware platform and the virtualization software, and an interface between the virtual machine and the virtualization software.