Mixed type equipment virtualization method based on KVM (Kernel-based Virtual Machine)

Abstract

The invention discloses a mixed type equipment virtualization method based on a KVM. An existing equipment virtualization model is additionally provided with a virtual machine access I / O (Input / Output) route selection controller; when the quantity of virtual machines which are to access I / O equipment is larger than the quantity of the I / O equipment on a physical machine, the virtual machines access the I / O equipment by adopting an equipment simulation I / O virtual route; when the quantity of the virtual machines which are to access the I / O equipment is smaller than the quantity of the I / O equipment on the physical machine, the virtual machines access the I / O equipment by adopting a direct I / O virtual route. The method disclosed by the invention has the advantages of reducing the average time delay for the virtual machines to access the I / O equipment and simultaneously increasing the utilization rate of the equipment.

Description

technical field [0001] The invention relates to the field of computers, in particular to virtualization of computer resources, and is suitable for solving the problem of how a virtual machine accesses a physical device. Background technique [0002] Virtualization technology is a method of abstracting and recombining different types of scattered physical resources on a physical platform according to different attributes, and presenting them to users in the form of logical resources. Virtualization technology was first applied to large platforms such as IBM. Due to the slow computer speed and low resource utilization rate at that time, and the computer resources were relatively expensive, people proposed to use time-division multiplexing of physical resources to improve resource utilization. , which is also the original idea of ​​virtualization. With the development of computer technology, PCs are becoming more and more popular, and their functions are becoming more and more...

AI Technical Summary

Problems solved by technology

The disadvantage is that the I / O access path is long, and the KVM module and the KVM virtual machine are required to complete an I / O request, and the KVM module and QEMU are switched multiple times, and the number of data copies is large, which makes the performance of the KVM virtual machine decrease.

The direct I / O virtualization method overcomes the defect of context switching, and also shortens the path for virtual machines to access I / O devices. In this method, the I / O performance is almost the same as that in the physical case, but the motherboard space on a server Limited, the number of PCI and PCIE devices that can be added is also limited. After the device is directly allocated, it can only be fixedly accessed by one virtual machine, and the utilization rate of physical devices is not high.

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