Virtual machine establishing method, virtual machine monitor and virtual machine system

Abstract

The embodiment of the invention provides a virtual machine establishing method, a virtual machine monitor and a virtual machine system. The method comprises the following steps of: mapping a guest frame number (GFN) corresponding to a pseudo-physical memory of the virtual machine to a sharing zero page, wherein the sharing zero page is a page that the page content in the physical memory is completely zero; distributing the physical memory page if the page is abnormal to cancel the mapping relationship between the GFN and the sharing zero page, and establishing a mapping relationship between the GFN and a machine frame number (MFN) of the physical memory page, when the virtual machine writes the GFN. By adopting the method, the memory usage of the virtual machine in the starting process can be reduced, and the density of the virtual machine can be improved. The virtual machine with Memory Overcommitted number are supported and concurrently started.

Description

technical field [0001] The invention relates to virtual machine technology, in particular to a method for creating a virtual machine, a virtual machine monitor and a virtual machine system. Background technique [0002] Virtualization technology is a decoupling method that separates underlying hardware devices from upper-level operating systems and applications. It introduces a virtual machine monitor (Virtual Machine Monitor, VMM) layer to directly manage underlying hardware resources, and creates an environment independent of the underlying hardware. A virtual machine (Virtual Machine, VM) is used by the upper-layer operating system and application programs. Virtualization technology, as one of the underlying important supporting technologies of the current popular cloud computing (Cloud Computing) platform, can greatly improve the resource utilization efficiency of physical devices. Such as figure 1 As shown, after system virtualization, a physical machine can run multi...

AI Technical Summary

Problems solved by technology

[0009] The above technologies do not consider the memory usage during the process of starting the GOS after the virtual machine is created, but first allocate all the memory required by the virtual machine to the virtual machine, and then reclaim part of the memory, which enables the physical machine to start the virtual machine concurrently. The number is limited by the amount of physical memory, reducing virtual machine density

Images