Saving and Restoring State Information for Virtualized Computer Systems

A computer readable storage disk or storage device comprising instructions that, when executed, cause a machine to:

• in response to a request to suspend operation of a virtual machine, place a trace on a memory page in a physical memory to detect at least one of a read access or a write access that occurs when state information of the virtual machine is saved in response to the request, the memory page associated with virtual memory hosted by the virtual machine;
• while the virtual machine continues to operate, initiate storing of the virtual memory of the virtual machine;
• and
• in response to a trigger of the trace, store an indication that the memory page is an active memory page.

A method comprising:

• in response to a request to suspend operation of a virtual machine, placing, by executing instructions with a processor, a trace on a memory page in a physical memory to detect at least one of a read access or a write access that occurs when state information of the virtual machine is saved in response to the request, the memory page associated with virtual memory hosted by the virtual machine;
• while the virtual machine continues to operate, initiating storing of the virtual memory of the virtual machine;
• and
• in response to a trigger of the trace, storing an indication that the memory page is an active memory page.