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| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-05-29 13:11:09 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-05-31 17:34:49 +0100 |
| commit | a43ae4dfe56a01f5b98ba0cb2f784b6a43bafcc6 (patch) | |
| tree | 558aed9db1b8864954a137308ea67ce398f3d5c6 /arch/arm64/include/asm/cpufeature.h | |
| parent | a725e3dda1813ed306734823ac4c65ca04e38500 (diff) | |
| download | linux-a43ae4dfe56a01f5b98ba0cb2f784b6a43bafcc6.tar.gz | |
arm64: Add 'ssbd' command-line option
On a system where the firmware implements ARCH_WORKAROUND_2,
it may be useful to either permanently enable or disable the
workaround for cases where the user decides that they'd rather
not get a trap overhead, and keep the mitigation permanently
on or off instead of switching it on exception entry/exit.
In any case, default to the mitigation being enabled.
Reviewed-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 09b0f2a80c8f..b50650f3e496 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -537,6 +537,12 @@ static inline u64 read_zcr_features(void) return zcr; } +#define ARM64_SSBD_UNKNOWN -1 +#define ARM64_SSBD_FORCE_DISABLE 0 +#define ARM64_SSBD_KERNEL 1 +#define ARM64_SSBD_FORCE_ENABLE 2 +#define ARM64_SSBD_MITIGATED 3 + #endif /* __ASSEMBLY__ */ #endif |