* Security fixes including CVE-2011-1583 CVE-2011-1898
* Enhancements to guest introspection (VM single stepping support for very
fine-grained access control)
* Many stability improvements, such as: 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 and 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.
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