Messages in this thread Patch in this message | | | From | Julien Thierry <> | Subject | [PATCH v7 24/25] arm64: Skip irqflags tracing for NMI in IRQs disabled context | Date | Wed, 12 Dec 2018 16:47:24 +0000 |
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When an NMI is raised while interrupts where disabled, the IRQ tracing already is in the correct state (i.e. hardirqs_off) and should be left as such when returning to the interrupted context.
Check whether PMR was masking interrupts when the NMI was raised and skip IRQ tracing if necessary.
Signed-off-by: Julien Thierry <julien.thierry@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm64/kernel/entry.S | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 7c9555c..82fbe7c 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -630,7 +630,18 @@ el1_irq: kernel_entry 1 enable_da_f #ifdef CONFIG_TRACE_IRQFLAGS +#ifdef CONFIG_ARM64_PSEUDO_NMI +alternative_if ARM64_HAS_IRQ_PRIO_MASKING + ldr x20, [sp, #S_PMR_SAVE] +alternative_else + mov x20, #GIC_PRIO_IRQON +alternative_endif + cmp x20, #GIC_PRIO_IRQOFF + /* Irqs were disabled, don't trace */ + b.ls 1f +#endif bl trace_hardirqs_off +1: #endif irq_handler @@ -652,8 +663,18 @@ alternative_else_nop_endif 1: #endif #ifdef CONFIG_TRACE_IRQFLAGS +#ifdef CONFIG_ARM64_PSEUDO_NMI + /* + * if IRQs were disabled when we received the interrupt, we have an NMI + * and we are not re-enabling interrupt upon eret. Skip tracing. + */ + cmp x20, #GIC_PRIO_IRQOFF + b.ls 1f +#endif bl trace_hardirqs_on +1: #endif + kernel_exit 1 ENDPROC(el1_irq) -- 1.9.1
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