powerpc/64s: support nospectre_v2 cmdline option

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Add support for disabling the kernel implemented spectre v2 mitigation
(count cache flush on context switch) via the nospectre_v2 and
mitigations=off cmdline options.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Christopher M. Riedl <cmr@informatik.wtf>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190524024647.381-1-cmr@informatik.wtf

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Christopher M. Riedl 2019-05-23 21:46:48 -05:00 • committed by Michael Ellerman

parent 6652bf6408

commit d8f0e0b073

1 changed files with 16 additions and 3 deletions

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arch/powerpc/kernel/security.c

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