在云计算环境中,为了实现资源共享,不同租户的虚拟机可能运行在同一台物理机器上,即虚拟机同驻,这将带来新的安全问题。为此,文章重点讨论同驻虚拟机所面临的一些新的安全威胁,包括资源干扰、隐蔽通道/侧信道、拒绝服务与虚拟机负载监听等,介绍现有虚拟机同驻探测方法,总结针对虚拟机同驻威胁的四种防御思路,并分析未来的研究趋势。 In a cloud computing environment, for the purpose of resource sharing, different tenants may run on the same physical machine, that is, the virtual machines are located on the same machine, which brings new security issues. To this end, the article focuses on some of the new security threats facing VMs, including resource interference, covert / sidechannel, denial of service and VM load monitoring. The paper introduces the existing methods of co-location detection with virtual machines. Virtual machine with the threat of four kinds of defense ideas, and analyze future research trends.