Dynamic EMS memory mappings method of virtual machine manager

Abstract

The invention discloses a dynamic memory mapping method of a virtual machine manager, the steps are that: separately establish a virtual machine page pool and a virtual machine manager page pool; when the virtual machine access is violated, the virtual machine manager dynamically establishes and updates the mapping relations f(p) form a physical memory collection P to a machine memory collection M in the virtual machine manager page pool; the inventive method can simultaneously support obtaining pages according to the requirements at upper layer, virtual storage, as well as memory shared functions, so as to make the virtual machine manager realize dynamic management and allocation of the virtual machine memory on the premise that the virtual machine manager sufficiently guarantees the virtual machine access memory performance.

Description

technical field [0001] The invention relates to a virtualization method, in particular to a dynamic memory mapping method of a virtual machine manager. Background technique [0002] The virtual machine (Virtual Machine, VM) technology originated in the 1960s. Its core idea is to virtualize multiple virtual computers (VMs) on a physical host, on which multiple independent operating systems can run simultaneously. A guest operating system (Guest OS) accesses actual physical resources through a virtual machine manager (Virtual Machine Monitor, VMM). Memory virtualization is one of the important functions of a virtual machine manager (VMM). Since memory is one of the most frequently accessed devices by virtual machines, the efficiency of memory virtualization will have a significant impact on the performance of virtual machines. Since modern computers usually adopt complex storage architectures such as segmented page storage management and multi-level page tables, this brings ...

AI Technical Summary

Problems solved by technology

[0010] First, the scalability of the mechanism is not strong

Affected by the development cycle, the above-mentioned VMM introduced different underlying support mechanisms when implementing different memory management functions, which made the memory management module increasingly complex and difficult to manage, limiting the scalability of the system

For example, in order to realize the Ballooning function, Xen introduced the Grant Table mechanism (see Keir Fraser in 2004, "Safe Hardware Access with the Xen Virtual Machine Monitor," in Proceedings of the 1st Workshop on Operating System and Architectural Support), but this mechanism does not Suitable for on-demand page fetching, memory swapping, and memory sharing, making it difficult to continue adding these memory management functions

[0011] Second, the integrity and coupling are not high

Since the underlying mechanisms used by the modules are independent of each other, it is difficult for these modules to work together effectively, or even conflict with each other

For example, in VMWare ESX Server, the memory sharing mechanism cannot be enabled at the same time as the switching mechanism

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