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Re:LLVM patch to fix half of Spectre attack by manol74 on Thursday January 04, 2018 @02:49PM (#16073424)
Qubes OS [1] does something like that

[1]: https://www.qubes-os.org/

Re:LLVM patch to fix half of Spectre attack by strongholdmedia on Friday January 05, 2018 @05:06PM (#16082154)
Yet Meltdown nuked exactly that.