Regarding VM/core/chip/motherboard boundaries ... A number of vexing CPU security vulnerabilities have resulted from a general class of optimizations that shar

Regarding VM/core/chip/motherboard boundaries ... A number of vexing CPU security vulnerabilities have resulted from a general class of optimizations that share cache resources (memory, TLBs, branch prediction tables, etc.) across different domains, which enables cross-domain attacks. There is a potential for vulnerabilities even when the domains are separated by a network boundary ... if those domains view the world through some shared cache at the network layer.