KVM: x86: Enable NMI Watchdog via in-kernel PIT source
LINT0 of the LAPIC can be used to route PIT events as NMI watchdog ticks
into the guest. This patch aligns the in-kernel irqchip emulation with
the user space irqchip with already supports this feature. The trick is
to route PIT interrupts to all LAPIC's LVT0 lines.
Rebased and slightly polished patch originally posted by Sheng Yang.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 0fc3cab..206cc11 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -380,6 +380,14 @@
}
break;
+ case APIC_DM_EXTINT:
+ /*
+ * Should only be called by kvm_apic_local_deliver() with LVT0,
+ * before NMI watchdog was enabled. Already handled by
+ * kvm_apic_accept_pic_intr().
+ */
+ break;
+
default:
printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
delivery_mode);
@@ -743,10 +751,13 @@
apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
break;
+ case APIC_LVT0:
+ if (val == APIC_DM_NMI)
+ apic_debug("Receive NMI setting on APIC_LVT0 "
+ "for cpu %d\n", apic->vcpu->vcpu_id);
case APIC_LVTT:
case APIC_LVTTHMR:
case APIC_LVTPC:
- case APIC_LVT0:
case APIC_LVT1:
case APIC_LVTERR:
/* TODO: Check vector */
@@ -961,12 +972,25 @@
return 0;
}
-static int __inject_apic_timer_irq(struct kvm_lapic *apic)
+int kvm_apic_local_deliver(struct kvm_vcpu *vcpu, int lvt_type)
{
- int vector;
+ struct kvm_lapic *apic = vcpu->arch.apic;
+ int vector, mode, trig_mode;
+ u32 reg;
- vector = apic_lvt_vector(apic, APIC_LVTT);
- return __apic_accept_irq(apic, APIC_DM_FIXED, vector, 1, 0);
+ if (apic && apic_enabled(apic)) {
+ reg = apic_get_reg(apic, lvt_type);
+ vector = reg & APIC_VECTOR_MASK;
+ mode = reg & APIC_MODE_MASK;
+ trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
+ return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
+ }
+ return 0;
+}
+
+static inline int __inject_apic_timer_irq(struct kvm_lapic *apic)
+{
+ return kvm_apic_local_deliver(apic->vcpu, APIC_LVTT);
}
static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)