It's now considered safe enough to use something like a Linux/Xen hypervisor to access multiple security domains https://en.wikipedia.org/wiki/Multiple_Independ

It's now considered safe enough to use something like a Linux/Xen hypervisor to access multiple security domains https://en.wikipedia.org/wiki/Multiple_Independent_Levels_of_Security https://en.wikipedia.org/wiki/Multiple_Independent_Levels_of... eg. https://www.ainfosec.com/wp-content/uploads/2015/09/AIS-SecureView-Overview.pdf https://www.ainfosec.com/wp-content/uploads/2015/09/AIS-Secu... https://www.ainfosec.com/wp-content/uploads/2015/09/SecureView_Overview_Master_PA_Cleared_7Oct13.pdf https://www.ainfosec.com/wp-content/uploads/2015/09/SecureVi...