Maybe it is a good time to update this lecture, since AWS launched the AWS Nitro System. There they say
"AWS has completely re-imagined our virtualization infrastructure. Traditionally, hypervisors protect the physical hardware and bios, virtualize the CPU, storage, networking, and provide a rich set of management capabilities. With the Nitro System, we are able to break apart those functions, offload them to dedicated hardware and software, and reduce costs by delivering practically all of the resources of a server to your instances."
Great call and thanks for researching this!
I have made a note of this for the next set of updates for this course.