HVM guests are fully virtualized.

VMs running on top of their hypervisors are not aware that they are sharing processing time with other clients on the same hardware. 

The host has the capability to emulate underlying hardware for each of its guest machines. 
This virtualization type provides the ability to run an operating system directly on top of a virtual machine without any modification — as if it were run on the bare-metal hardware. The advantage of this is that HVMs can use hardware extensions which provide very fast access to underlying hardware on the host system.

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