Xen is moving foward

Although Xen has not been included as default hypervisor in RHEL and has been losing some supporters. Xen is still attractive hypervisor. Xen is trying to support platforms in many ways. 

There some highlighted projects: 

• Mirage OS: a library OS that supports the most common web protocols and enables the development of sealed Xen Project appliances that can be run without a guest operating system on any Xen Project based cloud - led by Cambridge University
• Support for ARMv7 and ARMv8 based servers - led by Citrix
• Improvements to Nested Virtualization: Virtualzation of guest machines - led by Intel
• Significant extensions to the Xen Project Security Modules and Flask - led by the National Security Agency
• A new virtualization mode called PVH (PV on HVM: improving performance by support PV, remove emulated hardware pocessing), which promises to combine the best aspects of hardware virtualization and paravirtualization - led by Oracle
• Significant performance and scalability improvements - led by SUSE

References:

1. Xen became Linux Foundation Collaborative Project: http://blog.xen.org/index.php/2013/04/15/xen-is-now-a-linux-foundation-collaborative-project/

2. Xen Proejct home: http://www.xenproject.org/