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powerpc/64s: Add support for ori barrier_nospec patching

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Based on the RFI patching. This is required to be able to disable the
speculation barrier.

Only one barrier type is supported and it does nothing when the
firmware does not enable it. Also re-patching modules is not supported
So the only meaningful thing that can be done is patching out the
speculation barrier at boot when the user says it is not wanted.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michal Suchanek
2018-04-24 14:15:55 +10:00
committed by Michael Ellerman
parent a6b3964ad7
commit 2eea7f067f
6 changed files with 54 additions and 1 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 do_barrier_nospec_fixups(bool enable);
#endif /* !__ASSEMBLY__ */