Within guest mode are the standard two modes, so that a guest operating system runs in guest mode but supports the standard kernel and user modes for its kernel and user-space applications.

在客户模式中有两种标准模式，因此客户操作系统在客户模式中运行可以支持标准的内核，而在用户模式下运行则支持自己的内核和用户空间应用程序。

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By contrast, the mapping for the user-mode portion of the address space changes whenever a process switch happens.

与此相反，只要用户进程状态发生变化，其映射的地址空间也随即改变。

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Kernel space is flagged in the page tables as exclusive to privileged code (ring 2 or lower), hence a page fault is triggered if user-mode programs try to touch it.

系统内核所使用的内存空间通过特权码（privileged code，2级或者更低）来标记，以防止用户模式的程序访问到内核空间而发生页面错误。

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