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+SFI stands for Software-Based Fault Isolation. SFI is an isolation
+technique described by Wahbe et al. in their 1993 paper [Effcient
+Software-Based Fault Isolation](http://citeseer.ist.psu.edu/wahbe93efficient.html).
+Instead of running code is a separate process, untrusted code
+is loaded into into the host's address space, part of the address
+space is reserved to the application and referred to as its fault
+domain, and the code is rewritten such that it cannot modify or jump
+to addresses outside of its fault domain.