On Tue, May 22, 2018 at 04:06:40PM +0100, Marc Zyngier wrote:
> We're about to need the mitigation state in various parts of the
> kernel in order to do the right thing for userspace and guests.
>
> Let's expose an accessor that will let other subsystems know
> about the state.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx>
Mark.
> ---
> arch/arm64/include/asm/cpufeature.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
> index 9bc548e22784..1bacdf57f0af 100644
> --- a/arch/arm64/include/asm/cpufeature.h
> +++ b/arch/arm64/include/asm/cpufeature.h
> @@ -543,6 +543,16 @@ static inline u64 read_zcr_features(void)
> #define ARM64_SSBD_FORCE_ENABLE 2
> #define ARM64_SSBD_MITIGATED 3
>
> +static inline int arm64_get_ssbd_state(void)
> +{
> +#ifdef CONFIG_ARM64_SSBD
> + extern int ssbd_state;
> + return ssbd_state;
> +#else
> + return ARM64_SSBD_UNKNOWN;
> +#endif
> +}
> +
> #endif /* __ASSEMBLY__ */
>
> #endif
> --
> 2.14.2
>
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