换句话说，Xen hypervisor是硬件之上一层薄的软件层。为了在Xen hypervisor上运行，每个guest操作系统的内核和驱动程序都必须作出修改。
In other words, the Xen hypervisor is a thin layer of software that sits on top of the hardware; each guest operating system's kernel and drivers have to be modified to run on it.
GPFS 可移植层（PL）是内核特有的，必须为集群中的每个操作系统级别单独创建。
The GPFS portability layer (PL) is kernel-specific, and it must be created separately for each operating system level within your cluster.
首先，类似于将用户空间应用程序和内核函数连接起来的系统调用，一个通常可用的虚拟化调用(hapercall, hypervisor对操作系统进行的系统调用)层允许来宾系统向宿主操作系统发出请求。
First, similar to system calls that bridge user-space applications with kernel functions, a hypercall layer is commonly available that allows guests to make requests of the host operating system.
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