What is Hardware Assisted Virtualization and how does it work in VMware?
First generation enhancements include Intel Virtualization Technology (VT-x) and AMD’s AMD-V which both target privileged instructions with a new CPU execution mode feature that allows the VMM to run in a new root mode below ring 0.
As shown in the Figure privileged and sensitive calls are set to automatically trap to the hypervisor, removing the need for either binary translation or paravirtualization.
The guest state is stored in Virtual Machine Control Structures (VT-x) or Virtual Machine Control Blocks (AMD-V).
Processors with Intel VT and AMD-V became available in 2006, so only newer systems contain these hardware assist features.