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powerpc/64s: Enable barrier_nospec based on firmware settings

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Check what firmware told us and enable/disable the barrier_nospec as
appropriate.

We err on the side of enabling the barrier, as it's no-op on older
systems, see the comment for more detail.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michal Suchanek
2018-04-24 14:15:57 +10:00
committed by Michael Ellerman
parent 815069ca57
commit cb3d6759a9
4 changed files with 63 additions and 0 deletions
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arch/powerpc/include/asm/setup.h
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@@ -52,6 +52,7 @@ enum l1d_flush_type {
void setup_rfi_flush(enum l1d_flush_type, bool enable);
void do_rfi_flush_fixups(enum l1d_flush_type types);
void setup_barrier_nospec(void);
void do_barrier_nospec_fixups(bool enable);
extern bool barrier_nospec_enabled;