This layer is called a hypervisor, or virtual machine monitor ( VMM ). 这个层称为系统管理程序或虚拟机监视器(VMM)。
Xen is an open source virtual machine monitor ( hypervisor ) developed by XenSource. Xen是XenSource开发的一个开放源码虚拟机监视器(管理器)。
The intermediary software layer ( called the virtual machine monitor or hypervisor ) is between the OS and the hardware. 中间软件层(叫做虚拟机监控程序或管理程序)处于OS和硬件之间。
In a typical layered architecture, the layer that provides for the platform virtualization is called the hypervisor ( sometimes called the virtual machine monitor, or VMM ). 在典型的分层架构中,提供平台虚拟化的层称为hypervisor(有时称为虚拟机管理程序或VMM)。
The guest operating system uses APIs, provided by virtual machine monitor ( VMM ), to communicate with the hypervisor to directly access certain resources on the underlying hardware. 访客操作系统使用虚拟机监视程序(VMM)提供的API与hypervisor通信,从而直接访问底层硬件上的某些资源。