Most boundaries are obvious: network connections, process-to-process communication, file systems, operatingsystem interfaces, and so on, but some boundaries are more subtle.
This avoids network latency and the overhead of inter-process communication, as well as context switching in the operatingsystem, further contributing to extreme speed.
这样就能够避免网络延迟、进程间通信的开销以及操作系统中的上下文切换，从而进一步提高速度。
3
The VPA is a two-way communication zone between the operatingsystem and the hypervisor on information required about the virtual processor.