paravirt_ops Dom0
To understand why paravirt_ops gets treated as a separate piece, we have to recall that a lot of the early Xen development took place before virtualization went mainstream. The Xen developers, to paravirtualize the Linux kernel, made sweeping changes that proved to be difficult to merge with mainline kernel development.
paravirt_ops is a generic solution to this problem. It's a kernel-level framework for adding code to enable Linux to run under various hypervisors, including Xen. The idea is that, by making these interfaces part of the official kernel, we can make Xen less invasive and easier to maintain.
Xen has supported paravirt_ops domUs since version 3.1, and the official Linux kernel has had domU support since version 2.6.23 ...
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