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Subject[RFC 4/5] x86, Use NMI return notifier in MCE
Date
Use general NMI return notifier mechanism to replace the self
interrupt used in MCE handler.

Signed-off-by: Huang Ying <ying.huang@intel.com>
---
arch/x86/include/asm/entry_arch.h | 4 --
arch/x86/include/asm/irq_vectors.h | 5 ---
arch/x86/kernel/cpu/mcheck/mce.c | 50 +++++--------------------------------
arch/x86/kernel/entry_64.S | 5 ---
arch/x86/kernel/irqinit.c | 3 --
5 files changed, 7 insertions(+), 60 deletions(-)
--- a/arch/x86/include/asm/entry_arch.h
+++ b/arch/x86/include/asm/entry_arch.h
@@ -61,8 +61,4 @@ BUILD_INTERRUPT(thermal_interrupt,THERMA
BUILD_INTERRUPT(threshold_interrupt,THRESHOLD_APIC_VECTOR)
#endif

-#ifdef CONFIG_X86_MCE
-BUILD_INTERRUPT(mce_self_interrupt,MCE_SELF_VECTOR)
-#endif
-
#endif
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -121,11 +121,6 @@
#define UV_BAU_MESSAGE 0xea

/*
- * Self IPI vector for machine checks
- */
-#define MCE_SELF_VECTOR 0xeb
-
-/*
* Self IPI vector for NMI return notifier
*/
#define NMI_RETURN_NOTIFIER_VECTOR 0xe9
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -480,60 +480,24 @@ static inline void mce_get_rip(struct mc
m->ip = mce_rdmsrl(rip_msr);
}

-#ifdef CONFIG_X86_LOCAL_APIC
-/*
- * Called after interrupts have been reenabled again
- * when a MCE happened during an interrupts off region
- * in the kernel.
- */
-asmlinkage void smp_mce_self_interrupt(struct pt_regs *regs)
+static void __mce_report_event(struct nmi_return_notifier *nrn)
{
- ack_APIC_irq();
- exit_idle();
- irq_enter();
mce_notify_irq();
mce_schedule_work();
- irq_exit();
}
-#endif
+
+static DEFINE_PER_CPU(struct nmi_return_notifier, mce_nrn) = {
+ .on_nmi_return = __mce_report_event,
+};

static void mce_report_event(struct pt_regs *regs)
{
if (regs->flags & (X86_VM_MASK|X86_EFLAGS_IF)) {
- mce_notify_irq();
- /*
- * Triggering the work queue here is just an insurance
- * policy in case the syscall exit notify handler
- * doesn't run soon enough or ends up running on the
- * wrong CPU (can happen when audit sleeps)
- */
- mce_schedule_work();
+ __mce_report_event(NULL);
return;
}

-#ifdef CONFIG_X86_LOCAL_APIC
- /*
- * Without APIC do not notify. The event will be picked
- * up eventually.
- */
- if (!cpu_has_apic)
- return;
-
- /*
- * When interrupts are disabled we cannot use
- * kernel services safely. Trigger an self interrupt
- * through the APIC to instead do the notification
- * after interrupts are reenabled again.
- */
- apic->send_IPI_self(MCE_SELF_VECTOR);
-
- /*
- * Wait for idle afterwards again so that we don't leave the
- * APIC in a non idle state because the normal APIC writes
- * cannot exclude us.
- */
- apic_wait_icr_idle();
-#endif
+ nmi_return_notifier_schedule(&__get_cpu_var(mce_nrn));
}

DEFINE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1004,11 +1004,6 @@ apicinterrupt THRESHOLD_APIC_VECTOR \
apicinterrupt THERMAL_APIC_VECTOR \
thermal_interrupt smp_thermal_interrupt

-#ifdef CONFIG_X86_MCE
-apicinterrupt MCE_SELF_VECTOR \
- mce_self_interrupt smp_mce_self_interrupt
-#endif
-
#ifdef CONFIG_X86_LOCAL_APIC
apicinterrupt NMI_RETURN_NOTIFIER_VECTOR \
nmi_return_notifier_interrupt smp_nmi_return_notifier_interrupt
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -209,9 +209,6 @@ static void __init apic_intr_init(void)
#ifdef CONFIG_X86_MCE_THRESHOLD
alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
#endif
-#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_LOCAL_APIC)
- alloc_intr_gate(MCE_SELF_VECTOR, mce_self_interrupt);
-#endif
#ifdef CONFIG_X86_LOCAL_APIC
alloc_intr_gate(NMI_RETURN_NOTIFIER_VECTOR, nmi_return_notifier_interrupt);
#endif

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