operating system - When they say OS requires modification, what do they mean in Virtualization? -

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I'm reading an article about a virtual machine monitor Xen. They say that to work as a guest OS at the top of Xen, an operating system requires some modifications. Now, for an OS like Linux, I can understand what "modification" can mean. But in the case of OS such as Windows XP, what does that mean? I mean, XP is off proprietary OS right?

Zen was originally a university project working with a researcher (or security of infrastructure) As a government agency), you can get Windows Sources from Microsoft, you do not have permission to distribute your version of Windows.

This is what they did: They had a source code of Windows XP and then they ported XX into XAd, just to show that if Microsoft had ever officially supported Xen For, this would be possible.


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