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  • HVM(Hardware-Assisted Virtualization)

    A set of extra instructions is added that can be used by a process in VMX root
    mode. These instructions do things like allocating a memory page on which to
    store a full copy of the CPU state, start, and stop a VM. Finally, a set of bitmaps is
    defined indicating whether a particular interrupt, instruction, or exception should
    be passed to the virtual machine’s OS running in ring 0 or by the hypervisor
    running in VMX root mode.

    VT

    Intel VT提供了一种新的运行模式(VMX root mode),可以理解为Ring -1。

    同时提供几条新的指令,用来配置VMM的工作模式:

    • 分配一个内存页,用来存放CPU state的一个完整拷贝
    • 启动或者关闭一个VM
    • 设置一个位图,其中的每一位用来表示哪些interrupt/instruction/exception应该由Ring 0层的操作系统来执行,哪些指令由Ring -1层的VMM来执行。
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  • 原文地址:https://www.cnblogs.com/long123king/p/3479019.html
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