Abstract: Through direct device access, the influence of Virtual Machine (VM) on system performance could be decreased. Meanwhile, current device drivers could be used by guest operating systems. A method of direct Universal Serial Bus (USB) device access in virtual environment was proposed, and a model of direct device access and work flow based on QEMU were designed. The experimental results show the VM can directly access varied USB devices with the help of this method, and attain data transmission of acceptable rate.

摘要： 虚拟机对设备的直接访问可以减小系统开销,并充分利用现有的驱动程序。提出一种在虚拟化环境下直接访问USB设备的方法,并基于QEMU设计实现了虚拟机直接访问真实设备的系统模型及相关流程。实验结果表明,该方法能够帮助虚拟机对各类USB设备进行直接访问,数据传输效率在可接受的范围内。

关键词: 虚拟机, 设备访问, 操作系统, USB接口