Method for creating virtual machine, a virtual machine monitor, and a virtual machine system

A virtual machine monitor, wherein the virtual machine monitor comprises:

• a initialization virtual memory unit for mapping guest frame number (GFN) corresponding to a pseudo-physical memory of a virtual machine to a shared zero page, the shared zero page being a page having content of all zeros in the physical memory;
• a copy-on-write unit for, when the GFN is written by the virtual machine and if a page exception occurs, allocating a physical memory page to relieve the mapping relation between the guest frame number (GFN) and the shared zero page, and establishing a mapping relation between the guest frame number (GFN) and the machine frame number (MFN) of the physical memory page.

A virtual machine system, wherein the system comprises:

• a virtual machine monitor and virtual machine;
• wherein the virtual machine monitor is used to map guest frame number (GFN) corresponding to a pseudo-physical memory of a virtual machine to a shared zero page, the shared zero page being a page having content of all zeros in the physical memory;
• when the GFN is written by the virtual machine and if a page exception occurs, allocate a physical memory page to relieve the mapping relation between the guest frame number (GFN) and the shared zero page, and establish a mapping relation between the guest frame number (GFN) and a machine frame number (MFN) of the physical memory page.