KVM (for Kernel-based Virtual Machine) is a full 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.  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. 

kernel virtual machine

The Xen hypervisor is a layer of software running directly on computer hardware replacing the operating system thereby allowing the computer hardware to run multiple guest operating systems concurrently. It suppors x86, x86-64, Itanium, Power PC, and ARM processors allow the Xen hypervisor to run on a wide variety of computing devices.<BR><BR>With Xen virtualization, a thin software layer known as the Xen hypervisor is inserted between the server's hardware and the operating system. This provides an abstraction layer that allows each physical server to run one or more "virtual servers", effectively decoupling the operating system and its applications from the underlying physical server.

The Xen hypervisor is a layer of software running directly on computer hardware replacing the operating system thereby allowing the computer hardware to run multiple guest operating systems concurrently. It suppors x86, x86-64, Itanium, Power PC, and ARM processors allow the Xen hypervisor to run on a wide variety of computing devices.

Xen - Open Source Virtualization

VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. VirtualBox runs on Windows, Linux, Macintosh, and Solaris hosts and supports a large number of guest operating systems. So, for example, you can run Windows and Linux on your Mac. VirtualBox is a so-called hosted hypervisor. It requires an existing operating system to be installed. It can thus run alongside existing applications on that host. 

VirtualBox - Cross-Platform Virtualization Application

Libvirt is collection of software that provides a convenient way to manage virtual machines and other virtualization functionality, such as storage and network interface management. These software pieces include an API library, a daemon (libvirtd), and a command line utility (virsh). It provides a single way to manage multiple different virtualization providers/hypervisors like Xen, OpenVZ, VirualBox, Microsoft Hyper-V hypervisor, VMware.

Libvirt - The virtualization API

QEMU is a generic and open source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance.
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When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, and S390 guests. 

QEMU is a generic and open source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance.


QEMU - Machine Emulator and Virtualizer

XCP-ng is a virtualization platform based on Xen Source and Citrix® Hypervisor (formerly XenServer). XCP-ng stands for Xen Cloud Platform - New Generation and is a tribute to the old Open Source project XCP, which was abandoned when XenServer was open-sourced in 2013.

XCP-ng - A turnkey open source virtualization platform

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kernel virtual machine

Xen - Open Source Virtualization

VirtualBox - Cross-Platform Virtualization Application

Libvirt - The virtualization API

QEMU - Machine Emulator and Virtualizer

XCP-ng - A turnkey open source virtualization platform

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kernel virtual machine

Xen - Open Source Virtualization

VirtualBox - Cross-Platform Virtualization Application

Libvirt - The virtualization API

QEMU - Machine Emulator and Virtualizer

XCP-ng - A turnkey open source virtualization platform

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