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powerpc/64s: Patch barrier_nospec in modules

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Note that unlike RFI which is patched only in kernel the nospec state
reflects settings at the time the module was loaded.

Iterating all modules and re-patching every time the settings change
is not implemented.

Based on lwsync patching.

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 14:15:56 +10:00
committed by Michael Ellerman
parent 2eea7f067f
commit 815069ca57
4 changed files with 27 additions and 4 deletions
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7
arch/powerpc/include/asm/setup.h
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@@ -53,6 +53,13 @@ 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);
extern bool barrier_nospec_enabled;
#ifdef CONFIG_PPC_BOOK3S_64
void do_barrier_nospec_fixups_range(bool enable, void *start, void *end);
#else
static inline void do_barrier_nospec_fixups_range(bool enable, void *start, void *end) { };
#endif
#endif /* !__ASSEMBLY__ */