KVM: x86: Fix and refactor NMI watchdog emulation
This patch refactors the NMI watchdog delivery patch, consolidating
tests and providing a proper API for delivering watchdog events.
An included micro-optimization is to check only for apic_hw_enabled in
kvm_apic_local_deliver (the test for LVT mask is covering the
soft-disabled case already).
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Sheng Yang <sheng@linux.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 304f9dd..0b0d413 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -973,14 +973,12 @@
return 0;
}
-int kvm_apic_local_deliver(struct kvm_vcpu *vcpu, int lvt_type)
+static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
{
- struct kvm_lapic *apic = vcpu->arch.apic;
+ u32 reg = apic_get_reg(apic, lvt_type);
int vector, mode, trig_mode;
- u32 reg;
- if (apic && apic_enabled(apic)) {
- reg = apic_get_reg(apic, lvt_type);
+ if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
vector = reg & APIC_VECTOR_MASK;
mode = reg & APIC_MODE_MASK;
trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
@@ -989,9 +987,12 @@
return 0;
}
-static inline int __inject_apic_timer_irq(struct kvm_lapic *apic)
+void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
{
- return kvm_apic_local_deliver(apic->vcpu, APIC_LVTT);
+ struct kvm_lapic *apic = vcpu->arch.apic;
+
+ if (apic)
+ kvm_apic_local_deliver(apic, APIC_LVT0);
}
static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
@@ -1086,9 +1087,8 @@
{
struct kvm_lapic *apic = vcpu->arch.apic;
- if (apic && apic_lvt_enabled(apic, APIC_LVTT) &&
- atomic_read(&apic->timer.pending) > 0) {
- if (__inject_apic_timer_irq(apic))
+ if (apic && atomic_read(&apic->timer.pending) > 0) {
+ if (kvm_apic_local_deliver(apic, APIC_LVTT))
atomic_dec(&apic->timer.pending);
}
}