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Originally Posted by gpatrick
... Mainframes have had virtual machines for decades...
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In software, since 1972 with IBM's VM/370. In hardware since 1975 with Amdahl's Multiple Domain Facility (MDF).
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...and have been secure to my knowledge, unlike Xen, KVM, etc., but this may also be due to hardware...
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Security through hardware isolation and performance improvement, were the two key selling points for MDF. IBM's competitive response in the 1980s, Logical Partitioning (LPAR), offered (and still offers) similar capabilities.