半虚拟化I/O模型的KVM虚拟机域间通信优化方法

摘要

提出了一种半虚拟化网络模型来优化虚拟机域间通信的性能,通过共享内存建立通信通道来打破虚拟机之前的隔离屏障,减少在数据传输过程中的拷贝次数.基于内核虚拟机(kernel-based virtual machine,KVM)半虚拟化框架编程接口的实现方法可以简化设备I/O的模拟,减少特权指令模拟所需的根-非根模式的切换,提供高效的I/O模拟,并向客户提供标准的网络接口,使通信通道透明.利用共享内存的通信方法,其性能接近进程间通信.对系统原型进行测试,结果表明域间通信的吞吐量和响应延时都得到了较好的优化.%This paper presents a para-virtualized network model to optimize inter-VMs communication performance, which is designed as a shared-memory-based channel crossing barriers to reduce data copies in virtualization systems. The implementation of kernel-based virtual machine (KVM) with para-virtualized I/O device emulation can simplify I/O operation and reduce traps which incur switches between root and non-root modes in KVM. It provides an efficient I/O path and this communication channel is transparent to guest applications while the front-end driver has a standard interface for kernel. This method can achieve performance nearly at inter-processes communication level. The test results on prototype show that the throughput and latency of inter-VMs communication are improved.