what is vt

What is vt?

VT (Virtualization Technology) is a virtualization support system developed by Intel on its user platform in order to assist the implementation of virtualization technology at the hardware level. Prior to this, virtualization could only use software to virtualize the underlying architecture.

Introduction to VT

Intel has developed two sets of VT technologies: one is VT-i, mainly for Itanium architecture hosts: one is VT-x , mainly for IA32 architecture hosts.

VT-x relies on VMX (Virtual Machine Extension) to provide hardware support for virtualization technology.

As a chip-assisted virtualization technology, VMX provides two new states for virtualization: root mode (VMX root) and non-root mode (VMX non-root). Root mode is mainly suitable for Host OS or VMM environment.

In this mode, the behavior of the processor is similar to that without vT technology, and it can handle instructions of various privilege levels well, but VMX has its own set of instructions, and when loaded When data goes to certain registers, there will be some restrictions.

Non-root mode is considered for the Guest OS or vM environment. In this environment, many operations of the processor are restricted.

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