1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Xen PVH Support Brought Back Up For The Linux Kernel

Virtualization

Published on 13 December 2013 12:29 AM EST
Written by Michael Larabel in Virtualization
1 Comment

Konrad Rzeszutek Wilk at Oracle has re-posted the Xen PVH patches for the Linux kernel as he seeks to get support for para-virtualized hardware extensions into the Linux kernel.

Xen on Linux supports para-virtualization (PV) as a means of virtualization without depending upon any CPU virtualization extensions like AMD SVM or Intel VT-x. PVH, on the other hand, is a means of Xen para-virtualization that leverages the processor's hardware extensions for faster PV support. PVH is a new feature to Xen 4.4.

The Xen Wiki describes the new PVH virtualization mode as, "essentially a PV guest using PV drivers for boot and I/O. Otherwise it uses HW virtualization extensions, without the need for emulation. First patches are going into xen-unstable just after the Xen 4.3 release and functionality should be at least available as a pre-view in Xen 4.4. PVH has the potential to combine the best trade-offs of all virtualization modes, while simplifying the Xen architecture."

The only problem with Xen PVH is that the mainline Linux kernel doesn't support it even though patches were posted long ago, they got lost in the clutter. In Konrad's new mailing list post he noted, "Mukesh had posted them quite a while ago - they got reviewed, acked, etc, put in #linux-next, got patches to fix some things from folks. Then everybody focused on the Xen patches .. and now that is mostly baked this is what is needed on the Linux side to make it work with PVH...Decided to rebase all of them on v3.13-rc3 to make it easier."

Hopefully the Xen PVH support will be merged then for the Linux 3.14 kernel merge window in January. The official release of Xen 4.4 is also expected in January.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. Counter-Strike: Global Offensive NVIDIA/AMD Benchmarks On Linux
  2. Running Fedora 20 On Intel's Core i7 Haswell-E Platform
  3. A Tour Of The New Phoronix Office
  4. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
Latest Linux News
  1. The Features Coming For Fedora 21
  2. Counter-Strike: Global Offensive Starts Rolling Out To Linux Users
  3. The Gestures Support Of GNOME 3.14
  4. Linux 3.17 Has Basic Support For The Xbox One Controller
  5. openSUSE 13.2 Beta Still Using Btrfs By Default, & KDE Plasma 5 For Testing
  6. GTK+ 3.14 Brings Much Better Wayland Support, Multi-Touch, New Theme
  7. DisplayPort Comes To USB's Type-C Connector
  8. NSS Updated On Ubuntu 12.04/14.04 To Allow Netflix Support
  9. Linux 3.17-rc6 Released; Linux 3.17 Final Might Come In One Week
  10. X.Org Server 1.16.1 Released
Latest Forum Discussions
  1. Uselessd: A Stripped Down Version Of Systemd
  2. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  3. State of Nouveau now and in the near future?
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. Wasteland 2 Officially Launched Today, Including For Linux Gamers
  6. NVIDIA GTX 770/780 -works ?
  7. New stress testing utility for GPU's
  8. How to get Catalyst 14.4 working on Ubuntu 14.04