diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2020-04-06 15:55:06 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:14:58 +0200 |
| commit | f051f697955049c7cf10a635ab8149aa619243b2 (patch) | |
| tree | f4d5678ab79116e38137bd3401d2847b20d2a321 /arch/x86/include/asm/desc.h | |
| parent | 6271fef00b3489690e52ce95edbc378357513547 (diff) | |
x86/nmi: Protect NMI entry against instrumentation
Mark all functions in the fragile code parts noinstr or force inlining so
they can't be instrumented.
Also make the hardware latency tracer invocation explicit outside of
non-instrumentable section.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505135314.716186134@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/desc.h')
| -rw-r--r-- | arch/x86/include/asm/desc.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index 085a2dd312b4..d6c3d346c63a 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -214,7 +214,7 @@ static inline void native_load_gdt(const struct desc_ptr *dtr) asm volatile("lgdt %0"::"m" (*dtr)); } -static inline void native_load_idt(const struct desc_ptr *dtr) +static __always_inline void native_load_idt(const struct desc_ptr *dtr) { asm volatile("lidt %0"::"m" (*dtr)); } @@ -392,7 +392,7 @@ extern unsigned long system_vectors[]; #ifdef CONFIG_X86_64 DECLARE_PER_CPU(u32, debug_idt_ctr); -static inline bool is_debug_idt_enabled(void) +static __always_inline bool is_debug_idt_enabled(void) { if (this_cpu_read(debug_idt_ctr)) return true; @@ -400,7 +400,7 @@ static inline bool is_debug_idt_enabled(void) return false; } -static inline void load_debug_idt(void) +static __always_inline void load_debug_idt(void) { load_idt((const struct desc_ptr *)&debug_idt_descr); } @@ -422,7 +422,7 @@ static inline void load_debug_idt(void) * that doesn't need to disable interrupts, as nothing should be * bothering the CPU then. */ -static inline void load_current_idt(void) +static __always_inline void load_current_idt(void) { if (is_debug_idt_enabled()) load_debug_idt(); |