Messages in this thread Patch in this message | | | Subject | [PATCH 20/23] x86, kaiser: add a function to check for KAISER being enabled | From | Dave Hansen <> | Date | Wed, 22 Nov 2017 16:35:18 -0800 |
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From: Dave Hansen <dave.hansen@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.hansen@linux.intel.com> Cc: Moritz Lipp <moritz.lipp@iaik.tugraz.at> Cc: Daniel Gruss <daniel.gruss@iaik.tugraz.at> Cc: Michael Schwarz <michael.schwarz@iaik.tugraz.at> Cc: Richard Fellner <richard.fellner@student.tugraz.at> Cc: Andy Lutomirski <luto@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Kees Cook <keescook@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: x86@kernel.org ---
b/arch/x86/include/asm/kaiser.h | 5 +++++ b/include/linux/kaiser.h | 5 +++++ 2 files changed, 10 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 2017-11-22 15:45:55.262619723 -0800 +++ b/arch/x86/include/asm/kaiser.h 2017-11-22 15:45:55.267619723 -0800 @@ -56,6 +56,11 @@ 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 2017-11-22 15:45:55.264619723 -0800 +++ b/include/linux/kaiser.h 2017-11-22 15:45:55.268619723 -0800 @@ -28,5 +28,10 @@ static inline int kaiser_add_mapping(uns static inline void kaiser_add_mapping_cpu_entry(int cpu) { } + +static inline bool kaiser_active(void) +{ + return 0; +} #endif /* !CONFIG_KAISER */ #endif /* _INCLUDE_KAISER_H */ _
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