KVM虚拟化动态迁移技术的安全防护模型

Security Protection Model on Live Migration for KVM Virtualization

虚拟机动态迁移技术是在用户不知情的情况下使得虚拟机在不同宿主机之间动态地转移,保证计算任务的完成,具有负载均衡、解除硬件依赖、高效利用资源等优点,但此技术应用过程中会将虚拟机信息和用户信息暴露在网络通信中,其在虚拟化环境下的安全性成为广大用户担心的问题,逐渐成为学术界讨论和研究的热点问题.从研究虚拟化机制、虚拟化操作系统源代码出发,以虚拟机动态迁移的安全问题作为突破点,首先分析了虚拟机动态迁移时的内存泄漏安全隐患;其次结合KVM(kernel-based virtual machine)虚拟化技术原理、通信机制、迁移机制,设计并提出一种基于混合随机变换编码方式的安全防护模型,该模型在虚拟机动态迁移时的迁出端和迁入端增加数据监控模块和安全模块,保证虚拟机动态迁移时的数据安全;最后通过大量实验,仿真测试了该模型的安全防护能力和对虚拟机运行性能的影响.仿真结果表明,该安全防护模型可以在KVM虚拟化环境下保证虚拟机动态迁移的安全,并实现了虚拟机安全性和动态迁移性能的平衡.

Live migration of virtual machines is the transfer of running virtual machines from one host server to a new host server to ensure computing tasks completed without notifying the owners of virtual machines, which has many beneficial characteristics such as load balancing, hardware independent, and high efficiency utilization of resource. However, live migration of virtual machines exposes information of virtual machines and their users to the network, making its security in the virtualized environment a serious problem that concerns many users becomes a hot issue in the industry and academia. This article focuses on researching the mechanism of virtualization and the source code of virtualization operating system, and explores breakthrough in security problems of live migration. Firstly the article analyzes potential memory-leak security threat of live migration. Then it designs and puts forward a new security protection model based on hybrid random transform coding method. Combined with KVM（kernel-based virtual machine） virtualization structure, communication mechanism and migration mechanism, the model adds monitor module and security module at source and destination of live migration, ensuring the data security while the virtual machines are migrating. Finally, a series of experiments are designed to simulate and test the security protection capability of the model and its impact to virtual machine＇s performance. The simulation results show that the proposed model can ensure the security of live migration in the KVM virtualization environment, as well as balance the security of virtual machines and performance of live migration.