VITA, a non-profit standards organization, champions the use of open system architecture (OSA) worldwide through its membership of suppliers and end-users who share a common interest in critical and intelligent embedded systems.
Our mission is to build an ecosystem by expanding market opportunities for critical and intelligent embedded systems, delivering timely technical information to all members and fostering collaboration between suppliers and users.
Current standards we oversee include: VME, VXS, VPX, OpenVPX, VPX REDI, PMC, XMC, FMC, FMC+, VNX, Reliability Community, and many others.
What about use of partitioning hypervisors to provide spatial and temporal isolation? Have you looked into those? There is loads of academic research in this domain.
Check out Greg's OpenVPX tutorial on www.vita.com/Tutorials. It's freely available for download, and an excellent reference to complement the standard.