Newbies What Next ? News Forums Calendar


News Sections
General News (3987/0)
Reviews (636/0)
Press Releases (465/0)
Distributions (197/0)
Software (907/0)
Hardware (537/0)
Security (192/0)
Tutorials (356/0)
Off Topic (181/0)

User Functions


Don't have an account yet? Sign up as a New User

There are no upcoming events



KVM (for Kernel-based Virtual Machine) is a full, open source, virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. KVM also requires a modified QEMU although work is underway to get the required changes upstream.

Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.

The kernel component of KVM is included in mainline Linux, as of 2.6.20.†


Free to download


GNU GPL v2 - KVM kernel module
LGPL v2 - KVM user module, BIOS files
LGPL - QEMU virtual CPU core library and QEMU emulator

Red Hat, Inc


System Requirements
x86 machine running a recent Linux kernel on an Intel processor with VT (virtualization technology) extensions

or AMD processor with SVM extensions (also called AMD-V)

HOWTOs, FAQ, Mailing Lists

Selected Reviews:
IT Central Station

Features include:

  • QMP - Qemu Monitor Protocol; a JSON-based protocol which allows applications to communicate with a QEMU instance
  • KSM - Kernel Samepage Merging - lets the hypervisor system share identical memory pages amongst different processes or virtualized guests
  • Kvm Paravirtual Clock - a Paravirtual timesource for KVM which alleviates the problem where CPUs do not have a constant Time Stamp Counter
  • CPU Hotplug support - add CPUs on the fly. CPU hotplug is a controverse feature
  • PCI Hotplug support - add PCI devices on the fly
  • vmchannel - communication channel between the host and guests
  • migration - migrating Virtual Machines
  • SCSI disk emulation
  • Virtio Devices - Paravirtualized drivers to give a common framework for hypervisors for IO virtualization. Virtio was chosen to be the main platform for IO virtualization in KVM. This supports a paravirtual Ethernet card, a paravirtual disk I/O controller, a balloon device for adjusting guest memory usage, and a VGA graphics interface using SPICE or VMware driver
  • CPU clustering
  • High Precision Event Timer
  • device assignment
  • pxe boot
  • iscsi boot
  • x2apic - an x86 feature that improves performance, especially on large systems
  • floppy
  • cdrom
  • USB
  • USB host device passthrough
  • sound
  • Userspace Irqchip emulation
  • Userspace Pit emulation
  • Balloon memory driver
  • Large pages support
  • Stable Guest ABI
  • VMCS shadow support
  • APIC virtualization and posted interrupt hardware support for x86 virtualization
  • VMCS shadowing, where non-root VMREAD/VMWRITE will not trigger VM-Exit

Return to Hypervisors Home Page

Bookmark and Share

Last Updated Sunday, August 17 2014 @ 03:42 AM EDT

We have written a range of guides highlighting excellent free books for popular programming languages. Check out the following guides: C, C++, C#, Java, JavaScript, CoffeeScript, HTML, Python, Ruby, Perl, Haskell, PHP, Lisp, R, Prolog, Scala, Scheme, Forth, SQL, Node.js (new), Fortran (new), Erlang (new), Pascal (new), and Ada (new).

Group Tests
All Group Tests

Top Free Software
5 Office Suites
7 Document Processors
6 Lean Desktops
6 Desktop Search
9 Project Management
9 Groupware Apps
14 File Managers
10 Databases
21 Backup Tools
21 DVD Tools
21 Window Managers
21 Productivity Tools
9 Terminal Emulators
21 Financial Tools
21 Text Editors
21 Video Emulators
21 Home Emulators
42 Graphics Apps
6 CAD Apps
42 Scientific Apps
10 Web Browsers
42 Email Apps
12 Instant Messaging
10 IRC Clients
7 Twitter Clients
12 News Aggregators
11 VoIP Apps
11 Remote Display Apps
42 Best Games
42 More Games
21 More Games
21 Notable Games (1)
21 Notable Games (2)
21 Notable Games (3)
8 ASCII Games
9 Educational Games
42 Audio Apps
42 Video Apps
6 Screencasting Apps
80 Security Apps
9 System Monitoring
6 Family History Apps
11 PDF Tools
6 Music Servers
6 Collection Managers
7 Calculator Apps
8 Geometry Apps
Free Console Apps
14 Multimedia
8 Compilers
9 IDEs
9 Debuggers
7 Revision Control Apps
6 Doc Generators
'Free' Proprietary
21 Closed-Source Apps
Top Commercial Apps
42 Games
Free Web Software
21 Web CMS
14 Wiki Engines
8 Blog Apps
6 eCommerce Apps
5 Human Resource Apps
10 ERP
10 CRM
6 Data Warehouse Apps
8 Business Intelligence
6 Point-of-Sale

All Group Tests

Other Articles
Migrating from Windows
Back up your data
Distribution Guide
Distro Portal Pages
20 Free Linux Books
Running Linux Under Windows

Older Stories
Monday 03/09
  • Raspberry Pi 2: Raspbian (ARMv6) v Linaro (ARMv7) (0)

  • Friday 03/06
  • Raspberry Pi 2 review (0)

  • Sunday 02/22
  • Chess in a Few Bytes (0)
  • Learn the Art of Computer Programming With These Great Free Beginner Books (2)
  • CD Audio Grabbers (0)

  • Monday 01/19
  • fitlet is a tiny fanless PC full of openness (0)

  • Sunday 01/18
  • MintBox Mini gives Linux users a pocket-sized PC (0)
  • 6 Invaluable Assembly Books (0)

  • Wednesday 01/14
  • Why Mac users donít switch to Linux (0)
  • MIPS Creator CI20 review (0)

  • Vote

    What Linux distribution do you run on your main computer?

    637 votes | 3 comments

    Built with GeekLog and phpBB
    Comments to the webmaster are welcome
    Copyright 2009 - All rights reserved