Injection of page error in virtual machines to cause mapping of memory pages swapped out in VM virtualized memory

摘要

A host system [10] comprising a hardware processor [12] configured to operate: a hypervisor [30] configured to expose a virtual machine [32] comprising a virtualized processor [112] and virtualized memory [114], the virtual machine [32] configured to use the virtualized processor [112] to execute an objective process, in which exposing the virtual machine [32] comprises configuring a data structure to store a current state of the virtualized processor [112], comprising the data structure an event injection field that, when set to a predetermined value, causes the virtualized processor [112] to generate a page error; and a memory introspection engine [40] running outside the virtual machine [32], in which the host system [10] is characterized by having the memory introspection engine [40] configured to: determine accordingly with a virtual machine page table [32] if a target page [60a] of a virtual memory space of the target process is exchanged out of virtualized memory [114]; and in response, when the target page [60a] is exchanged out of virtualized memory [114], it directly injects the page error into the virtual machine [32], causing the page error that an operating system [34] of the virtual machine [32] map the target page [60a] to a page [60c] of the virtualized memory [114], in which the direct injection of the page error comprises that the memory introspection engine [40] writes the default value to the event injection field.