Konstantin Belousov 319117fd57 IBRS support, AKA Spectre hardware mitigation. ... It is coded according to the Intel document 336996-001, reading of the patches posted on lkml, and some additional consultations with Intel. For existing processors, you need a microcode update which adds IBRS CPU features, and to manually enable it by setting the tunable/sysctl hw.ibrs_disable to 0. Current status can be checked in sysctl hw.ibrs_active. The mitigation might be inactive if the CPU feature is not patched in, or if CPU reports that IBRS use is not required, by IA32_ARCH_CAP_IBRS_ALL bit. Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D14029		2018-01-31 14:36:27 +00:00
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cpuctl.c	IBRS support, AKA Spectre hardware mitigation.	2018-01-31 14:36:27 +00:00