diff options
| author |   Diana Craciun <diana.craciun@nxp.com> | 2018-12-12 16:03:00 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-12-20 22:53:39 +1100 |
| commit | 76a5eaa38b15dda92cd6964248c39b5a6f3a4e9d (patch) | |
| tree | d7dcc7429ba50e9ab050dbd0ef444b87a3f78683 /arch/powerpc/include/asm/setup.h | |
| parent | powerpc/prom: move the device tree if not in declared memory. (diff) | |
| download | wireguard-linux-76a5eaa38b15dda92cd6964248c39b5a6f3a4e9d.tar.xz wireguard-linux-76a5eaa38b15dda92cd6964248c39b5a6f3a4e9d.zip | |
powerpc/fsl: Add infrastructure to fixup branch predictor flush
In order to protect against speculation attacks (Spectre
variant 2) on NXP PowerPC platforms, the branch predictor
should be flushed when the privillege level is changed.
This patch is adding the infrastructure to fixup at runtime
the code sections that are performing the branch predictor flush
depending on a boot arg parameter which is added later in a
separate patch.
Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/setup.h')
| -rw-r--r-- | arch/powerpc/include/asm/setup.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/setup.h b/arch/powerpc/include/asm/setup.h index 1fffbba8d6a5..c941c8c6bfb3 100644 --- a/arch/powerpc/include/asm/setup.h +++ b/arch/powerpc/include/asm/setup.h @@ -67,6 +67,8 @@ void do_barrier_nospec_fixups_range(bool enable, void *start, void *end); static inline void do_barrier_nospec_fixups_range(bool enable, void *start, void *end) { }; #endif +void do_btb_flush_fixups(void); + #endif /* !__ASSEMBLY__ */ #endif /* _ASM_POWERPC_SETUP_H */ |