Virtualization is faster than emulation.
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Most code directly executes as native CPU instructions without changes (low over head)
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“Sensitive” instructions must be intercepted and handled by the hypervisor.
Ideally, processor architecture supports native virtualization
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This means all sensitive instructions used by a virtual machine can be intercepted and handled by the hypervisor on that architecture.
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This allows Operating System to be run in a virtual machine without modification.
Early x86 processors did not support native virtualization.
