Xen.org, the community which develops the Xen hypervisor under the GNU General Public License (GPLv2) has released a maintenance update for Xen brining it to version 4.1.1. The update can be installed on top of Xen 4.1 which was released in March this year.
The update provides the following changes:
- Security fixes including CVE-2011-1583 CVE-2011-1898
- Guest introspection enhancements providing VM single stepping support for very fine-grained access control
- Stability improvements
- PV-on-HVM stability fixes (fixing some IRQ issues)
- XSAVE cpu feature support for PV guests (allows safe use of latest multimedia instructions)
- RAS fixes for high availability,
- Fixes for offlining bad pages
- Changes to libxc, mainly of benefit to libvirt
- Compatibility fixes for newer Linux guests, newer compilers, some old guest savefiles, newer Python, grub2, some hardware/BIOS bugs.
For users who are still on the Xen 4.0 hypervisor, Xen.org also released Xen 4.0.2, providing a subset of the fixes metioned above for the 4.0 version.