The TAP driver allows the guest operating system to read or write raw Ethernet frames to a virtual Ethernet device (extended to user space).
TAP驱动程序使访客操作系统能够将原始以太网帧写到一个虚拟以太网设备(用户空间的扩展)。
In this virtual environment, still need to simulate the hardware device, install the Guest operating system, and also need to modify the operating system kernel.
在这种虚拟环境下，依然需要模拟硬件设备，安装Guest操作系统，并且还需要修改操作系统的内核。
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.
虚拟机对设备的直接访问可以减小系统开销，并充分利用现有的驱动程序。
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