diff options
| author | Diana Craciun <diana.craciun@nxp.com> | 2018-12-12 17:03:00 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-20 14:53:39 +0300 |
| commit | 76a5eaa38b15dda92cd6964248c39b5a6f3a4e9d (patch) | |
| tree | d7dcc7429ba50e9ab050dbd0ef444b87a3f78683 /arch/powerpc/include/asm | |
| parent | f242e0ac95cadb27527d0b06c957723c9f63dd74 (diff) | |
| download | linux-76a5eaa38b15dda92cd6964248c39b5a6f3a4e9d.tar.xz | |
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')
| -rw-r--r-- | arch/powerpc/include/asm/feature-fixups.h | 12 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/setup.h | 2 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/feature-fixups.h b/arch/powerpc/include/asm/feature-fixups.h index 33b6f9c892c8..40a6c9261a6b 100644 --- a/arch/powerpc/include/asm/feature-fixups.h +++ b/arch/powerpc/include/asm/feature-fixups.h @@ -221,6 +221,17 @@ label##3: \ FTR_ENTRY_OFFSET 953b-954b; \ .popsection; +#define START_BTB_FLUSH_SECTION \ +955: \ + +#define END_BTB_FLUSH_SECTION \ +956: \ + .pushsection __btb_flush_fixup,"a"; \ + .align 2; \ +957: \ + FTR_ENTRY_OFFSET 955b-957b; \ + FTR_ENTRY_OFFSET 956b-957b; \ + .popsection; #ifndef __ASSEMBLY__ #include <linux/types.h> @@ -230,6 +241,7 @@ extern long __start___stf_entry_barrier_fixup, __stop___stf_entry_barrier_fixup; extern long __start___stf_exit_barrier_fixup, __stop___stf_exit_barrier_fixup; extern long __start___rfi_flush_fixup, __stop___rfi_flush_fixup; extern long __start___barrier_nospec_fixup, __stop___barrier_nospec_fixup; +extern long __start__btb_flush_fixup, __stop__btb_flush_fixup; void apply_feature_fixups(void); void setup_feature_keys(void); 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 */ |