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SPECIFICTION
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Xen Project Hypervisor

xenproject.org

Free plan LinuxSelf-hosted
Visit xenproject.org
Spec score 8.3 #7 of 24 in Virtual machine software

What it is

Xen Project Hypervisor is a free, open-source type-1 hypervisor that runs multiple operating systems on one host. The project describes uses including server and desktop virtualization, IaaS, embedded systems, security applications, and hardware appliances. Linux is the most common control stack; NetBSD and FreeBSD are also named as host options. Xen’s microkernel design has a small memory footprint and restricts the interface exposed to guests. It can run a system’s main device driver inside a VM, allowing that VM to be restarted after a driver crash or compromise without affecting the rest of the system. On x86, fully paravirtualized guests can run without virtualization extensions. Listed capabilities include snapshots, nested virtualization, and GPU acceleration. The separate XAPI toolstack supports multi-host management, snapshots and migration, resource pools, storage migration, Open vSwitch, event tracking, upgrades, patching, and monitoring. Its built-in guest support and templates cover Windows and Linux. Downloads are source releases for building, packaging, and platform integration.

Spec sheet

Purpose
Xen is a type-1 bare-metal hypervisor that runs multiple operating systems in parallel on one host.Read 4 Oct 2026 · xenproject.org
Audience
The project identifies infrastructure, embedded, automotive, security-sensitive, and safety-critical systems as areas Xen serves.Read 4 Oct 2026 · xenproject.org
Free plan
YesRead 20 Sep 2026 · xenproject.org
License
The project says software hosted on XenProject.org is open source and licensed under GPL2.Read 4 Oct 2026 · xenproject.org
Downloads
The downloads page lists Xen 4.22.0 source and describes the Xen artifacts as source releases for building, packaging, and platform integration.Read 4 Oct 2026 · xenproject.org
Driver isolation
Xen can run a system’s main device driver inside a VM so that VM can be restarted after a driver crash or compromise without affecting the rest of the system.Read 4 Oct 2026 · xenproject.org
GPU acceleration
YesRead 20 Sep 2026 · xenproject.org
Guest architecture
bothRead 20 Sep 2026 · xenproject.org
Guest support
XAPI provides built-in support and templates for Windows and Linux guests.Read 4 Oct 2026 · xenproject.org
Host operating systems
Linux is the most common control stack, and Xen also names NetBSD and FreeBSD as alternatives.Read 4 Oct 2026 · xenproject.org
Host platforms
Linux,NetBSD,FreeBSDRead 20 Sep 2026 · xenproject.org
Management
The separate XAPI toolstack supports multiple hosts, VM snapshots and migration, resource pools, Open vSwitch, storage migration, event tracking, upgrades, patching, and monitoring.Read 4 Oct 2026 · xenproject.org
Microkernel design
Xen says its microkernel design has a small memory footprint and a restricted interface to guests.Read 4 Oct 2026 · xenproject.org
Nested virtualization
YesRead 20 Sep 2026 · xenproject.org
Paravirtualization
On x86, Xen supports fully paravirtualized guests that can run on hardware without virtualization extensions.Read 4 Oct 2026 · xenproject.org
Project governance
Xen Project is a Linux Foundation collaborative project with an open governance process based on openness, transparency, and meritocracy.Read 4 Oct 2026 · xenproject.org
Release support
Xen 4.20 and later releases receive three years of full support and two additional years of security-only support.Read 4 Oct 2026 · xenproject.org
Security reporting
The security policy asks vulnerability reporters to contact [email protected] and describes private downstream notification followed by public disclosure.Read 4 Oct 2026 · xenproject.org
Use cases
The project describes Xen as a foundation for server virtualization, IaaS, desktop virtualization, security applications, embedded systems, and hardware appliances.Read 4 Oct 2026 · xenproject.org
VM snapshots
YesRead 20 Sep 2026 · xenproject.org

Plans and prices

Xen Project Hypervisor Free Open-source hypervisor source releases for building, packaging, and platform integration Read 4 Oct 2026 · xenproject.org

Every Xen Project Hypervisor plan and price →

Strong points and limits

Strong points

  • Runs multiple operating systems on one host.
  • Supports snapshots, nested virtualization, and GPU acceleration.
  • XAPI provides multi-host management and VM migration.
  • Windows and Linux guest templates are available.
  • Free, open-source source releases.

Limits

  • Downloads are source releases, not ready-to-use packages.
  • XAPI is a separate toolstack.
  • No free trial is listed.

Who it suits

Xen suits infrastructure, embedded, automotive, security-sensitive, and safety-critical systems. It is relevant to users who can build, package, and integrate source releases into a Linux, NetBSD, or FreeBSD host environment.

Verdict

Xen provides a free hypervisor with guest isolation and a wide set of management capabilities through XAPI. Its source-release distribution means building and platform integration are part of the deployment picture.

Where Specifiction places it

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