Commit 242bff38 authored Jul 20, 2018 by Marc Zyngier Committed by Greg Kroah-Hartman Jul 22, 2018

arm64: ssbd: Add global mitigation state accessor



commit c32e1736ca03904c03de0e4459a673be194f56fd upstream.

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>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 3a64e6a9

arch/arm64/include/asm/cpufeature.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -227,6 +227,16 @@ static inline bool system_supports_mixed_endian_el0(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