The document summarizes updates to Linux support in the Xen hypervisor project, including 5 Linux kernel releases supported between versions 3.12-3.16, additional maintainers added, Itanium architecture support removed in 3.14, and new features added such as blkback physical device support on ARM in 3.13 and experimental PVH virtualization support in 3.14. Further work items are also listed such as improving testing, productizing PVH, and developing a common Xenbus state machine.

1. Linux on Xen: Status Update
David Vrabel
18 August 2014

2. Headlines
I 5 releases: 3.12 to 3.16.
I Additional maintainers: David Vrabel and Boris Ostrovsky.
I Itanium support removed (3.14)
18 August 2014 Linux on Xen: Status Update 2 / 6

3. New Features
I blkback can use physical devices on ARM (3.13)
I Experimental PVH support (3.14)
I FIFO-based Event Channels (3.14)
I Drivers enabled on ARM: Framebuer and balloon (3.14)
I Support for PCI devices with high MMIO regions (3.16)
18 August 2014 Linux on Xen: Status Update 3 / 6

4. Performance Improvements
I PV ticketlocks (3.12)
I blkfront non-persistent data path (3.13)
I From-guest (Tx) grant mapping in netback (3.15)
I Multiqueue netback and netfront (3.16)
18 August 2014 Linux on Xen: Status Update 4 / 6

5. Pipeline
I VNUMA.
I PV SCSI backend and frontend.
I perf tool support.
18 August 2014 Linux on Xen: Status Update 5 / 6

6. Further Work
I Improve testing (particularly live migration).
I Productize PVH.
I m2p override replacement.
I PAT for uncached and write-combining mappings.
I Common Xenbus state machine.
18 August 2014 Linux on Xen: Status Update 6 / 6