[PATCH 06/14] arm64: ssbd: Add global mitigation state accessor
From: mark.rutland@arm.com (Mark Rutland)
Date: 2018-05-24 11:41:23
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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 <redacted>
Reviewed-by: Mark Rutland <mark.rutland@arm.com> Mark.
quoted hunk ↗ jump to hunk
--- 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