Projects / Xen


Xen is a virtual machine monitor for x86 that supports execution of multiple guest operating systems in isolated environments.

Operating Systems

Recent releases

  •  10 Apr 2011 02:59

    Release Notes: This version adds a re-architected XL toolstack that is functionally nearly equivalent to XM/XEND, a prototype credit2 scheduler designed for latency-sensitive workloads and very large systems, CPU Pools for advanced partitioning, support for large systems (>255 processors and 1GB/2MB super page support), support for x86 Advanced Vector eXtension (AVX), and a new Memory Access API enabling integration of third party security solutions into Xen virtualized environments.

    •  26 Aug 2010 08:52

      Release Notes: A number of important new features and updates were made. These include blktap2, a high performance VHD implementation supporting snapshots and clones including live snapshots. Netchannel2 provides support for new Smart NICs with multi-queue and SR-IOV functionality. Fault tolerance allows live transactional synchronization of VM state between physical servers. Libxenlight is a new library providing higher-level control of Xen between various toolstacks. PV-USB and VGA pass-through were implemented. Furthermore, other features were added, performance and scalability were improved, and many bugs were fixed.

      •  31 May 2009 18:39

        Release Notes: Device passthrough improvements, with particular emphasis on support for client devices. RAS features: CPU and memory offlining. Power management: improved frequency/voltage controls and deep-sleep support. Scheduler and timers are optimized for peak power savings. Support for the Viridian (Hyper-V) enlightenment interface. Many other x86 and ia64 enhancements and fixes.

        •  13 Jan 2009 02:06

          Release Notes: This release adds power management (P & C states) in the hypervisor, PVSCSI drivers, and HVM emulation domains. It has improved paravirtualization, device passthrough, hardware-assisted paging, HVM framebuffer, and shadow pagetable performance. It has improved safety of domain transfer across systems with different CPU models. There are assorted bugfixes and other minor enhancements.

          •  15 Aug 2008 06:37

            Release Notes: New features include Xen Security Modules (XSM), ACPI S3 suspend-to-RAM support for the host system, preliminary PCI pass-through support (using appropriate Intel or AMD I/O-virtualization hardware), and preliminary support for a wider range of bootloaders in fully virtualized (HVM) guests, using full emulation of x86 real mode. Emulation of standard (non-super) VGA modes for HVM guests was made faster. Configurable timer modes were added for HVM guests, depending on how the guest OS manages time-keeping.

            Recent comments

            01 May 2005 22:10 jsuthan

            at zues homenetwork.. we loving it.

            I am hosting free freeshell service at Currently due to security issue we turn on hold for now [been offline for almost 2 months now ;)]. At moment building hold new shell enviroment base on Xen technology. It great security features and I just loving it.. I hope will see continue works on upcoming kernels, INTERGRATED as default!! Part I love about Xen is that some of my enhance kernel patches still working without problem.

            Thanks. It's cool.


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