Xen Changes For Linux 4.11: Lands PVHv2 Guest Support

The latest pull request worth mentioning for the Linux 4.11 merge window are the Xen virtualization feature updates.

New to the Xen code with Linux 4.11 is adding support for booting Linux as a Xen PVH guest. PVHv2 support for unprivileged guests is the main feature addition for Linux 4.11 while there is also the streamlining the Xenbus driver, support for a new device model hypercall, and made small corrections.