Post-copy based live virtual machine migration via speculative execution and pre-paging

摘要

The method includes post copy migrating a guest virtual machine from a migration source host to a migration target host, executing the instruction stream of the guest virtual machine on the migration target host, and determining, by the migration target host, when the guest virtual machine encounters the page fault. When the guest virtual machine encounters the page fault, the method includes requesting, by the migration target host, the not-present page from the migration source host for loading on the migration target host, and emulating, on an emulator executing on or in communication with the migration target host, continued execution of the instruction stream of the guest virtual machine. The method also includes identifying, by the emulator, future page references to future pages from the emulated continued execution of the instruction stream, and requesting the future pages from the migration source host in parallel with the not-present page request.