Virtual machine migration method, virtual machine migration device and source physical host

An embodiment of the invention provides a virtual machine migration method, a virtual machine migration device and a source physical host and relates to the technical field of virtual machine migration, aiming to shortening power-off time of a virtual machine on a target physical host to improve migration performance of the virtual machine. The virtual machine migration method includes that after the virtual machine migrates to the target physical host from the source physical host and recovers to run on the target physical host, the source physical host sends a to-be-synchronized memory page of the virtual machine to the target physical host through a network interface on the basis of a first band width; the source physical host receives a page fault request sent from the target physical host through the network interface; the source physical host finds out the faulted memory page according to information of the faulted memory page contained in the page fault request, and sends the faulted memory page to the