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by scj 827 days ago
To rephrase your question, are there any Long Mode user space changes?

Skimming Intel's spec ( https://cdrdv2.intel.com/v1/dl/getContent/776648 ), the X86S looks really risk-adverse towards changing Long Mode user space.

I don't recognize any changes offhand, but my knowledge of x86 legacy is pretty limited (and will hopefully be obsolete soon).