关键词: 众核处理器，虚拟化技术，I/O虚拟化，DMA重映射，中断重定向

Abstract: I/O resources of many cores processor are shared by many cores. I/O virtualization supports I/O resources efficient share and secure isolation, and is adopted by more and more processors. Hardware enhanccxnent for I/O virtualination is taken into account when it's architecture is designed, and it provides a general and efficient resolvent. This paper studied two key techniques of I/O virtualization-DMA remapping and Interrupt redirection. Firstly put forward a IOTSB cache management method based on hint and invalidation method based on invalidation queue to optimize DMA remapping performance, then a flexible and controllable interrupt redirection method was brought forward to supportreliable and efficient interrupt routing. Experimental results show the hardware enhancement method for I/O virtualization which we put forward not only can support efficient sharing of I/O resource with little cost, but also can provide almost the same I/O performance as environment without I/O virtualization.

Key words: Many-cores processor, Virtualization technology,I/O virtualization,D MA remapping,Interrupt redirection