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Xen Project Hypervisor
What it is
Xen Project Hypervisor is a free, open-source type-1 hypervisor for running multiple operating systems on one host. It is used as a foundation for server and desktop virtualization, IaaS, embedded systems, security applications, and hardware appliances. Linux is the most common control stack, while NetBSD and FreeBSD are also named as host options. Xen's microkernel design is intended to keep its memory footprint small and limit the interface presented to guests. It can place a system’s main device driver in a VM so that VM can be restarted after a driver crash or compromise without affecting the rest of the system. On x86, fully paravirtualized guests can run on hardware without virtualization extensions. Listed capabilities include VM snapshots, nested virtualization, and GPU acceleration. The separate XAPI toolstack supports multiple hosts, VM snapshots and migration, resource pools, storage migration, monitoring, upgrades, patching, event tracking, and Open vSwitch. Its built-in guest support and templates cover Windows and Linux. Xen downloads are source releases for building, packaging, and platform integration.
For and against
For
- Runs multiple operating systems on one host
- Supports VM snapshots, nested virtualization, and GPU acceleration
- Driver isolation can limit the impact of a failure
- XAPI supports multi-host management and VM migration
- Windows and Linux guest templates are available
Against
- Downloads are source releases for building and integration
- XAPI is a separate toolstack
The verdict
Xen offers virtualization capabilities for multiple host and guest environments, with XAPI providing a broad set of management functions. Its downloads are source releases, so building, packaging, and platform integration are part of the stated distribution model.
Who it suits
Xen may suit infrastructure, embedded, automotive, security-sensitive, and safety-critical systems. Its separate XAPI toolstack is relevant to users managing multiple hosts and virtual machines.
Plans and prices
Xen Project Hypervisor
Open-source hypervisor source releases for building, packaging, and platform integration
Read 4 Oct 2026 · xenproject.org
On the record
- Audience
- The project identifies infrastructure, embedded, automotive, security-sensitive, and safety-critical systems as areas Xen serves.xenproject.org · read 4 Oct 2026
- Downloads
- The downloads page lists Xen 4.22.0 source and describes the Xen artifacts as source releases for building, packaging, and platform integration.xenproject.org · read 4 Oct 2026
- 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.xenproject.org · read 4 Oct 2026
- GPU acceleration
- Yesxenproject.org · read 20 Sep 2026
- Guest architecture
- bothxenproject.org · read 20 Sep 2026
- Guest support
- XAPI provides built-in support and templates for Windows and Linux guests.xenproject.org · read 4 Oct 2026
- Host operating systems
- Linux is the most common control stack, and Xen also names NetBSD and FreeBSD as alternatives.xenproject.org · read 4 Oct 2026
- Host platforms
- Linux,NetBSD,FreeBSDxenproject.org · read 20 Sep 2026
- License
- The project says software hosted on XenProject.org is open source and licensed under GPL2.xenproject.org · read 4 Oct 2026
- Management
- The separate XAPI toolstack supports multiple hosts, VM snapshots and migration, resource pools, Open vSwitch, storage migration, event tracking, upgrades, patching, and monitoring.xenproject.org · read 4 Oct 2026
- Microkernel design
- Xen says its microkernel design has a small memory footprint and a restricted interface to guests.xenproject.org · read 4 Oct 2026
- Nested virtualization
- Yesxenproject.org · read 20 Sep 2026
- Paravirtualization
- On x86, Xen supports fully paravirtualized guests that can run on hardware without virtualization extensions.xenproject.org · read 4 Oct 2026
- Project governance
- Xen Project is a Linux Foundation collaborative project with an open governance process based on openness, transparency, and meritocracy.xenproject.org · read 4 Oct 2026
- Purpose
- Xen is a type-1 bare-metal hypervisor that runs multiple operating systems in parallel on one host.xenproject.org · read 4 Oct 2026
- Release support
- Xen 4.20 and later releases receive three years of full support and two additional years of security-only support.xenproject.org · read 4 Oct 2026
- Security reporting
- The security policy asks vulnerability reporters to contact [email protected] and describes private downstream notification followed by public disclosure.xenproject.org · read 4 Oct 2026
- VM snapshots
- Yesxenproject.org · read 20 Sep 2026
