Xen virtual machine fork mechanism establishment method

Abstract

The invention belongs to the field of computer virtual technologies, and in particular relates to a Xen virtual machine Fork mechanism building method. The method mainly comprises the steps of starting a xen system, and setting two progresses in a libxl module main function of an Xen core; building parent DomU and starting up the same, reading an is_parent zone bit under own DomU in an Xenstore, and if the zone bit is equal to 1, executing fork operation of the parent DomU; building a son DomU and starting up the same, reading the is_parent zone bit under own DomU in the Xenstore, and if the zone bit is equal to 0, executing fork operation of the son DomU; and reading an authorization list subscript and page offset in the Xenstore, a register state value, and a function name to be executed by using the son DomU, mapping an authorization page, restoring the state of the register, and then executing the function.

Description

technical field [0001] The invention belongs to the technical field of computer virtualization, and in particular relates to a method for establishing a Xen virtual machine Fork mechanism. Background technique [0002] Xen is an open source virtual machine monitor. The virtual machine running on Xen is called Domain (domain). Among the many Domains on Xen, there is a privileged domain to assist Xen in managing other Domains and provide corresponding virtual resources. Services, especially the access of other Domains to I / O devices, this privileged domain is called Domain0 (abbreviation: Dom0), while others are called DomainU (abbreviation: DomU). In this article, the virtual machines referred to by the Fork mechanism refer to DomU. Fork means fork and clone. The Xen system implements a shared memory mechanism for data sharing and transfer between Domains. It is based on the authorization mechanism between Domains, that is, access to shared memory needs to be pre-authorized...

AI Technical Summary

Problems solved by technology

[0005] The existing virtual machine cloning technology is static cloning. First, suspend or shut down the virtual machine to be cloned, then manually perform the cloning operation, and finally restore the original virtual machine and start a new virtual machine. This method does not conform to the virtual machine fork. The automatic requirement of cloning a sub-virtual machine scenario while the original virtual machine is running, this cloning method can be called dynamic cloning

Moreover, because static cloning suspends or shuts down the original virtual machine, there is a clear period of time when the service is unavailable, which violates the idea of ​​​​imitating the Linux process fork mechanism

Images