Only just as Xen had release their 3.4 release back in June they have now started on their roadmap to version 4.0 of the Xen Hypervisor.

New great features include :

• RDMA Live Migration Support
• Dom0 kernel in Linux 2.6.30 or later
• Dom0 support for Marvell 6480 disk driver
• Pass through USB-Controllers/Devices for PV Guests
• Fault Tolerance - Project Remus and/or Kemari
• Monitor, Limit, Control network traffic coming at DomUs
• Internationalization / Unicode Support
• Configure Virtual Bridge like Real Switch (e.g. Control VLAN, port status)
• VLan tagging per NIC in the VM Config File
• Virtual Ethernet Switch
• Physical Xen boot/install support via native UEFI (pUEFI) and virtual UEFI (vUEFI) support
• Limit I/O for individual disks of VM (similar to credit scheduler weight)
• Dynamic Memory Management for Overcommiting RAM
• PCI CGA Passthrough for VT-d (vendor cards like Nvidia, AIT, etc)
• Full AMD IOMMU Support
• Online resizing of DomU Disks
• Cross compliling Xen and Modular Builds