OpenBSD Journal

Spectre Variant 2 mitigation for kernel committed to -current

Contributed by rueda on from the reduce-speed-now dept.

Working at p2k18, Theo de Raadt (deraadt@) has committed Spectre Variant 2 mitigations:

Module name:	src
Changes by:	2018/04/27 09:19:32

Modified files:
	sys/arch/amd64/conf: Makefile.amd64 
	sys/arch/i386/conf: Makefile.i386 

Log message:
-fretpoline for non-RAMDISK kernels.  Skylake product needs it, and
therefore all other x86 cpus must pay the performance price of the
hazard workaround until Skylake disappears from the ecosystem eventually
like 486. This returns your cpu's performance to pre-inflated performance.
ok mlarkin guenther

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