What's an operating system anyway? The questions we posed this week were quite disconnected, but they inspired similar perspectives from the comments. Not least, respondents to the first article sought to address what exactly was an operating system. Graham Bartlett summed it up perhaps, by saying: The answer really is " …
And then there is security
While providing an abstracted view of the hardware, an operating system also brings some baggage. One bag contains security holes that the applications that run upon the operating system do not have.
The same is true for hypervisors. The more features that are integrated into the hypervisor such as management facilities, the more vulnerabilites arise. An operating system places a bunch of applications at increased risk and a hypervisor places a bunch of guests and even more applications at risk.
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