Commit c32e1736 authored May 29, 2018 by Marc Zyngier Committed by Catalin Marinas May 31, 2018

arm64: ssbd: Add global mitigation state accessor



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.

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>

parent a43ae4df

arch/arm64/include/asm/cpufeature.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -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