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| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-05-29 13:11:12 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-05-31 17:35:19 +0100 |
| commit | 647d0519b53f440a55df163de21c52a8205431cc (patch) | |
| tree | 32e7b767c30e75ce88dfd6574b9c4f8343148e6c /arch/arm64/include | |
| parent | 986372c4367f46b34a3c0f6918d7fb95cbdf39d6 (diff) | |
| download | blackbird-op-linux-647d0519b53f440a55df163de21c52a8205431cc.tar.gz blackbird-op-linux-647d0519b53f440a55df163de21c52a8205431cc.zip | |
arm64: ssbd: Restore mitigation status on CPU resume
On a system where firmware can dynamically change the state of the
mitigation, the CPU will always come up with the mitigation enabled,
including when coming back from suspend.
If the user has requested "no mitigation" via a command line option,
let's enforce it by calling into the firmware again to disable it.
Similarily, for a resume from hibernate, the mitigation could have
been disabled by the boot kernel. Let's ensure that it is set
back on in that case.
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@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')
| -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 b0fc3224ce8a..55bc1f073bfb 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -553,6 +553,12 @@ static inline int arm64_get_ssbd_state(void) #endif } +#ifdef CONFIG_ARM64_SSBD +void arm64_set_ssbd_mitigation(bool state); +#else +static inline void arm64_set_ssbd_mitigation(bool state) {} +#endif + #endif /* __ASSEMBLY__ */ #endif |
