从底层来说，这也意味着要复制一些内核的基础设施，同时解决可能出现的大量新系统调用，从而提供所有必要的功能。
On the downside, this also means duplicating some infrastructure of the kernel as well as adding a potentially large number of new system calls to provide all necessary functionality.
在这种模型中，宿主运行单一OS内核并向每个访客操作系统导出操作系统功能。
In this model, the host runs a single OS kernel as its core and exports operating system functionality to each of the guest operating systems.
Linux系统调用接口提供了用户空间应用程序调用内核功能的方法。
The Linux system call interface provides the means for user-space applications to invoke kernel functionality.
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