Linux mainline contains all the Xen code bits for Dom0 and DomU support

“Over the years, a number of efforts were made to get these pv /
dom0 patches submitted into the mainline kernel but at times the
code was not considered acceptable by a number of the linux kernel
maintainers and little progress was made. Over the last 2 years a
renewed effort started to really convert the code into patches
considerd acceptable and a set of people : Jeremy Fitzharding,
Konrad Rzeszutek Wilk, Ian Campbell , Stefano Stabellini (and
others not mentioned but obviously also important) focused on
getting this stuff done once and for all… and so.. bit by bit.
code was rewritten submitted for review, rewritten again until it
was consider ok. In terms of timeline, a good chunk of code has
gone in over time to handle Linux as a well behaved guest (DomU)
first, then followed by all the work to make the Dom0 happy as
well.”

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