The second architecture is called user space device emulation (see Figure 2).
第二个架构称为用户空间设备模拟(见图2)。
The VMM also implements device emulation for devices made available to each guest.
VMM还为每个来宾可用的设备实现了设备模拟。
The hypervisor implements the back-end drivers for the particular device emulation.
Hypervisor为特定的设备模拟实现后端驱动程序。
Before we jump into passthrough, let's explore how device emulation works today in two hypervisor architectures.
在探索透传技术之前，让我们先讨论一下如今设备模拟在两个管理程序架构中是如何工作的。
As the name implies, rather than the device emulation being embedded within the hypervisor, it is instead implemented in user space.
顾名思义，这种设备模拟是在用户空间中实现的，而不嵌入到管理程序中。
This article touched on device emulation, and one of the most important applications that provides this functionality is QEMU (a system emulator).
本文讨论设备模拟，提供该功能的最重要应用程序之一是QEMU(一个系统模拟器)。
Regardless of whether the device emulation occurs in the hypervisor or on top in a guest virtual machine (VM), the emulation methods are similar.
无论设备模拟发生在管理程序内还是在一个客户虚拟机(VM)之上，模拟方法都是相似的。
The first architecture incorporates device emulation within the hypervisor, while the second pushes device emulation to a hypervisor-external application.
第一个架构将设备模拟整合到管理程序中，而第二个架构将设备模拟推到管理程序之外的一个应用程序中。
The VMI relies on a compatible hypervisor and potentially some configuration of the hypervisor's device emulation, but the focus remains on the application.
VMI依赖一个兼容的管理程序，而且可能需要对该管理程序的设备模拟进行一些配置，但其关注点还是在应用程序上。
Pushing the device emulation from the hypervisor to user space has some distinct advantages. The most important advantage relates to what's called the trusted computing base (TCB).
将设备模拟从管理程序推向用户空间有一些明显的优势，最大的优势涉及所谓的可信计算基础(trusted computing base, TCB)。
Device emulation is an important part of the hypervisor, bridging the gap between virtual devices in the VM to physical devices below the hypervisor.
设备模拟是管理程序的重要部分，填补了VM中的虚拟设备和管理程序中的物理设备之间的缺口。
Device emulation is an important part of the hypervisor, bridging the gap between virtual devices in the VM to physical devices below the hypervisor.
设备模拟是管理程序的重要部分，填补了VM中的虚拟设备和管理程序中的物理设备之间的缺口。
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