From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Cc: Moritz Lipp <moritz.lipp@xxxxxxxxxxxxxx>
Cc: Daniel Gruss <daniel.gruss@xxxxxxxxxxxxxx>
Cc: Michael Schwarz <michael.schwarz@xxxxxxxxxxxxxx>
Cc: Richard Fellner <richard.fellner@xxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: x86@xxxxxxxxxx
---
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 */
_
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