User-mode Linux (paravirtualization)
User-modeLinux（超虚拟化）
Full virtualization vs. paravirtualization.
完全虚拟化和半虚拟化。
The right side of Figure 1 shows the paravirtualization case.
图1的右边是半虚拟化示例。
Hardware support for full virtualization and paravirtualization.
对完全虚拟化和超虚拟化的硬件支持。
Another popular virtualization technique is called paravirtualization.
另一种流行的虚拟化技术称为半虚拟化。
Although (reportedly) simple, Lguest provides for true paravirtualization.
尽管Lguest很简单(据说是这样的)，但它能提供真正的准虚拟化。
User-mode Linux is another paravirtualization solution that is open source.
User - modeLinux是另外一个超虚拟化解决方案，也是开源的。
In sum, Virtio delivers most of the performance benefits of paravirtualization.
总之，使用Virtio可获得半虚拟化的最佳性能收益。
Xen is a free open source solution for operating system-level paravirtualization from XenSource.
Xen是一个来自于XenSource的操作系统级超虚拟化的免费开源解决方案。
This article touched on a two virtualization mechanisms: full virtualization and paravirtualization.
这篇文章谈论两个虚拟化机制：完全虚拟化和半虚拟化。
There are three primary VM modes: Full virtualization, Paravirtualization, and virtual Private Servers.
有三种主要的虚拟机模式：全虚拟化、半虚拟化和虚拟私有服务器。
The system relies on paravirtualization, so that guest operating systems are aware that they are virtualized.
此系统依赖半虚拟化，以便来宾操作系统意识到它们已被虚拟化。
OKL4 implements paravirtualization, which means that operating systems must be instrumented to run on the microvisor.
OKL4实现了半虚拟化，意味着操作系统必须能在microvisor上运行。
In the paravirtualization scheme, the guest and the hypervisor can work cooperatively to make this emulation efficient.
在半虚拟化模式中，来宾操作系统和hypervisor能够共同合作，让模拟更加高效。
This article begins with an introduction to paravirtualization and emulated devices, and then explores the details of virtio.
本文在开篇时介绍半虚拟化和模拟设备，然后探索virtio的细节。
As shown in Figure 5, the guest operating system includes a thin layer of Lguest code (by definition, paravirtualization).
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)。
Let's start with a quick discussion of two distinct types of virtualization schemes: full virtualization and paravirtualization.
让我们快速讨论一下两种类型完全不同的虚拟化模式：完全虚拟化和半虚拟化。
As I mentioned, paravirtualization requires the guest operating systems to be modified for the hypervisor, which is a disadvantage.
正如前面介绍的一样，超虚拟化技术需要为hypervisor修改客户操作系统，这是它的一个缺点。
Paravirtualization is a technique in which a software interface that is similar but not identical to the underlying hardware is presented.
泛虚拟化是这样一种技术，软件接口以与底层硬件相似但并不完全一致的方式得以呈现。
In paravirtualization, the control program implements a hypervisor application program interface (API) that is used by the guest operating system.
在半虚拟化中，控制程序实现了管理程序的应用程序接口(API)，它将由来宾操作系统使用。
The downside to the paravirtualization approach is that the operating system is aware that it's being virtualized and requires modifications to work.
半虚拟化方法的缺点是操作系统知道它被虚拟化，并且需要修改才能工作。
Xen is an open source paravirtualization solution that requires modifications to the guest operating systems but achieves near native performance by collaborating with the hypervisor.
Xen是一个开源的超虚拟化解决方案，它虽然需要对客户操作系统进行修改，但可以通过与hypervisor 的协作获得接近原始系统的性能。
Recall that in paravirtualization the hypervisor and the operating system collaborate on the virtualization, requiring operating system changes but resulting in near native performance.
回想一下在超虚拟化中，hypervisor和操作系统会共同协作，虽然操作系统需要进行一些更改，但却可以带来接近于原始系统的性能。
Recall that in paravirtualization the hypervisor and the operating system collaborate on the virtualization, requiring operating system changes but resulting in near native performance.
回想一下在超虚拟化中，hypervisor和操作系统会共同协作，虽然操作系统需要进行一些更改，但却可以带来接近于原始系统的性能。
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