Why do KVM needs Hardware Assisted support to install even Linux based OS

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http://serverfault.com – For XEN we dont need Hardware Assisted support for running linux os. But why do we need that for KVM for running even linux based os. Can Kvm be configured to support para virtualization. Edit: With full virtualization guests may not be aware that its being virtualized,and can degrade total performance,and in para virtualization guests are aware that its being virtualized and hence can result in improved performance is that so?? (HowTos)