From: Dave Hansen <dave.han...@linux.intel.com> Currently, all of the checks for KAISER are compile-time checks.
Runtime checks are needed for turning it on/off at runtime. Add a function to do that. Signed-off-by: Dave Hansen <dave.han...@linux.intel.com> Cc: Moritz Lipp <moritz.l...@iaik.tugraz.at> Cc: Daniel Gruss <daniel.gr...@iaik.tugraz.at> Cc: Michael Schwarz <michael.schw...@iaik.tugraz.at> Cc: Richard Fellner <richard.fell...@student.tugraz.at> Cc: Andy Lutomirski <l...@kernel.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Kees Cook <keesc...@google.com> Cc: Hugh Dickins <hu...@google.com> Cc: x...@kernel.org --- b/arch/x86/include/asm/kaiser.h | 5 +++++ b/include/linux/kaiser.h | 4 ++++ 2 files changed, 9 insertions(+) diff -puN arch/x86/include/asm/kaiser.h~kaiser-dynamic-check-func arch/x86/include/asm/kaiser.h --- a/arch/x86/include/asm/kaiser.h~kaiser-dynamic-check-func 2017-11-10 11:22:19.435244924 -0800 +++ b/arch/x86/include/asm/kaiser.h 2017-11-10 11:22:19.440244924 -0800 @@ -50,6 +50,11 @@ extern void kaiser_remove_mapping(unsign */ extern void kaiser_init(void); +static inline bool kaiser_active(void) +{ + extern int kaiser_enabled; + return kaiser_enabled; +} #endif #endif /* __ASSEMBLY__ */ diff -puN include/linux/kaiser.h~kaiser-dynamic-check-func include/linux/kaiser.h --- a/include/linux/kaiser.h~kaiser-dynamic-check-func 2017-11-10 11:22:19.437244924 -0800 +++ b/include/linux/kaiser.h 2017-11-10 11:22:19.440244924 -0800 @@ -25,5 +25,9 @@ static inline int kaiser_add_mapping(uns return 0; } +static inline bool kaiser_active(void) +{ + return 0; +} #endif /* !CONFIG_KAISER */ #endif /* _INCLUDE_KAISER_H */ _