The virtual OS instance can access the mounted file systems without any issues, but direct mounting from OS instance is not possible.
虚拟OS实例可以正常访问挂载的文件系统，但是无法直接从OS实例挂载文件系统。
2
They have no virtual memory support, don't have directaccess to the computer's RAM, and have extremely limited interrupt support.
它们没有虚拟内存的支持，不能直接访问计算机的RAM，中断支持也非常有限。
3
Through direct device access, the influence of Virtual Machine (VM) on system performance could be decreased. Meanwhile, current device drivers could be used by guest operating systems.