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。
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。
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。
Also, zero-copy operations reduce the number of time-consuming mode switches between user space and kernel space.
同样，零-拷贝操作减少了耗费时间的用户态-系统态状态切换的次数，从而节省了时间。
VI Architecture (VIA) reduces the communication overhead by eliminating the context switch between the user mode and the kernel mode and using the application space as the network data buffer .
通过消除数据传输过程中用户态和核心态之间上下文切换、将应用程序空间直接作为网络数据缓存来降低通信开销。
This system also adopts some technologies such as communications between user space and kernel space, sending package from kernel mode, kernel module hiding, etc.
系统还采用了用户态—内核态通信、内核态发包、内核模块隐藏等技术。
This system also adopts some technologies such as communications between user space and kernel space, sending package from kernel mode, kernel module hiding, etc.
系统还采用了用户态—内核态通信、内核态发包、内核模块隐藏等技术。
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