BitVisor is a tiny hypervisor initially designed for mediating I/O access from a single guest OS. Its implementation is mature enough to run Windows and Linux, and can be used as a generic platform for various research and development projects.
Hypervisor R&D for recent x86 with support for DRTM + 2D paging
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XMHF is no longer in active development. It is superseded by uberXMHF (uber eXtensible Micro-Hypervisor Framework) which is available at: http://uberxmhf.org
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XMHF is an eXtensible and Modular Hypervisor Framework that strives to be a comprehensible and flexible platform for performing hypervisor research and development. The framework allows others to build custom (security-sensitive) hypervisor-based solutions (called "hypapps").
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A hardware supported hypervisor originally built for malware analysis. Features: Linux VM introspection, minimal detectability, small (~150KB), simple, and well documented. Can be used for other purposes. Support for Intel-VT & Windows coming soon.