还有软件层以帮助企业把IT基础架构变成自己的云，也就是“数据中心的虚拟操作系统”。
The other is software that helps firms to turn their IT infrastructure into their own cloud, known as a “virtual operating system for data centres”.
管理程序指的是一种软件虚拟化程序，它在操作系统和机器物理资源之间提供了一个抽象层。
A hypervisor is a software virtualization program that provides a layer of abstraction between operating systems and physical resources on a machine.
使用全虚拟化，在虚拟化的操作系统和硬件之间存在一个层，用于决定访问。
With full virtualization, a layer exists between the virtualized operating systems and the hardware as a way to arbitrate access.
如图5所示，来宾操作系统包含一个Lguest代码瘦层(根据定义，就是准虚拟化)。
As shown in Figure 5, the guest operating system includes a thin layer of Lguest code (by definition, paravirtualization).
虚拟机管理程序(hypervisor)是一个较薄的虚拟化软件层，它抽象化来自服务器平台的操作系统和应用程序。
The hypervisor is a thin layer of virtualization software that abstracts the operating system and applications from the server platform.
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.
这种虚拟技术以Xen为代表，其特点是修改操作系统的内核，加入一个Xen Hypervisor层。
This virtual technology represented by Xen, which is characterized by modifying the operating system kernel, adding a Xen Hypervisor layer.
这种虚拟技术以Xen为代表，其特点是修改操作系统的内核，加入一个Xen Hypervisor层。
This virtual technology represented by Xen, which is characterized by modifying the operating system kernel, adding a Xen Hypervisor layer.
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