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A comment on PCID is now a critical performance/security feature on x86. Parent comment

Re:PCID is now a critical performance/security feature on x86 by dmitrygr on Monday January 08, 2018 @06:49PM (#16102097)
with PCID, you only flush the kernel mappings out of the TLB (as user mappings are the same). Without PCID you can only flush TLB or not, so you do, and thus user mappings are gone too and need to be repopulated.
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