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kib
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2018-01-31T16:56:02.781664Z
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When switching IBRS on, also enable STIBP (Single Thread Indirect
Branch Predictors) mitigation.

DOcument 336996-001 promises that CPUs which implement IBRS but not
STIBP silently ignore setting of the bit instead of trapping.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END