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

A Virtual KMS Driver For QEMU Comes, Again

Linux Kernel

Published on 02 May 2012 02:03 PM EDT
Written by Michael Larabel in Linux Kernel
8 Comments

A virtual Cirrus KMS driver has once again appeared for providing kernel mode-setting support for virtualized guests using QEMU.

It was more than one year ago that a virtual Cirrus KMS driver was published by Red Hat's Matthew Garrett for use with QEMU/KVM virtualization, rather than just having the xf86-video-cirrus DDX driver to use. Back then the driver was working fairly well from my initial testing, but it never ended up being merged about or heard about again... Until today.

David Airlie has published an updated virtual Cirrus Linux KMS driver intended for use with QEMU. From the mailing list, "This is the initial driver for emulated cirrus GPU found in qemu. This driver only supports the emulated GPU and doesn't attempt to bind to any real cirrus GPUs. This driver is intended to be used with xf86-video-modesetting in userspace. This follow the same design as ast and mgag200, and is based on work done by Matthew Garrett previously. This GPU has no hw cursor, and it can't scanout 32-bpp, only packed 24-bpp. i.e. it sucks."

This virtual kernel mode-setting driver for the Linux kernel is just around 2,000 lines of code and will presumably be set for merging into the Linux 3.5 kernel. The xf86-video-cirrus isn't being adapted to handle the Cirrus DRM driver, but rather is intended to just work with the generic xf86-video-modesetting DDX.

This is just the latest basic KMS driver to be published by Red Hat. In recent weeks there's been a Matrox KMS driver and the AST KMS driver. After moving to ship DRI2-only drivers in Fedora 17, Red Hat is looking to ship KMS-only drivers in future versions of Red Hat Enterprise Linux.

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. A Tour Of The New Phoronix Office
  2. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
  3. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
  4. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
Latest Linux News
  1. Linux 3.17-rc6 Released; Linux 3.17 Final Might Come In One Week
  2. X.Org Server 1.16.1 Released
  3. Mesa Gets Closer To Having OpenGL 4.0 Tessellation Support
  4. Uselessd: A Stripped Down Version Of Systemd
  5. F2FS Tools Gain FSCK Support
  6. FreeBSD 10.1 Has The New VT Driver, Hardware Improvements
  7. AntiMicro 2.6 Yields Greater Compatibility For Gamepads On Linux
  8. OpenGL 3.3 / GLSL 3.30 Lands For Intel Sandy Bridge On Mesa
  9. AMD's RadeonSI Gallium3D Driver Sees Some Improvements
  10. Mesa 10.3 Released With The Latest Open-Source GPU Driver Improvements
Latest Forum Discussions
  1. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  2. Uselessd: A Stripped Down Version Of Systemd
  3. Wasteland 2 Officially Launched Today, Including For Linux Gamers
  4. NVIDIA GTX 770/780 -works ?
  5. Trolling on the Phoronix forums
  6. New stress testing utility for GPU's
  7. ASRock AM1H-ITX: One Of The Best AM1 Mini-ITX Motherboards
  8. Can Linux kill a motherboard?