Types of Hypervisor Technology Part-I

Depending on their implementation, there are basically two types of ways in which Hypervisors work. They are called Type I and Type II hypervisors. All products that implement Hypervisor technology fall into one of these two types.

Type I Hypervisors.

Type I Hypervisors run directly on the Hardware. Instead of the Operating system, they are fully in charge of the management of system resources. The operating systems run on top of the Hypervisor which intercepts their requests and manages them in such a way that they are completely independent of each other Figure

A Type I approach to Hypervisors

As can be seen in Figure 1, the three guest operating systems (OS’s) are running on top of the hypervisor. The OS’s see only those resources that the Hypervisor presents to them. As can be seen from the above figure, the guest operating systems run at the second level above the hardware. 

Part-II http://world-of-virtualization.blogspot.com/2009/01/types-of-hypervisor-technology-part-ii.html