KVM: x86: Fold kvm_get_apic_interrupt() into kvm_cpu_get_interrupt()

Fold kvm_get_apic_interrupt() into kvm_cpu_get_interrupt() now that nVMX
essentially open codes kvm_get_apic_interrupt() in order to correctly
emulate nested posted interrupts.

Opportunistically stop exporting kvm_cpu_get_interrupt(), as the
aforementioned nVMX flow was the only user in vendor code.

Link: https://lore.kernel.org/r/20240906043413.1049633-6-seanjc@google.comSigned-off-by: Sean Christopherson <seanjc@google.com>

arch/x86/kvm/irq.c

@@ -142,9 +142,12 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
 	if (vector != -1)
 		return vector;			/* PIC */
 
-	return kvm_get_apic_interrupt(v);	/* APIC */
+	vector = kvm_apic_has_interrupt(v);	/* APIC */
+	if (vector != -1)
+		kvm_apic_ack_interrupt(v, vector);
+
+	return vector;
 }
-EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
 
 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
 {

arch/x86/kvm/lapic.c

@@ -2959,16 +2959,6 @@ void kvm_apic_ack_interrupt(struct kvm_vcpu *vcpu, int vector)
 }
 EXPORT_SYMBOL_GPL(kvm_apic_ack_interrupt);
 
-int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
-{
-	int vector = kvm_apic_has_interrupt(vcpu);
-
-	if (vector != -1)
-		kvm_apic_ack_interrupt(vcpu, vector);
-
-	return vector;
-}
-
 static int kvm_apic_state_fixup(struct kvm_vcpu *vcpu,
 		struct kvm_lapic_state *s, bool set)
 {

arch/x86/kvm/lapic.h

@@ -90,7 +90,6 @@ void kvm_free_lapic(struct kvm_vcpu *vcpu);
 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu);
 void kvm_apic_ack_interrupt(struct kvm_vcpu *vcpu, int vector);
 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu);
-int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu);
 int kvm_apic_accept_events(struct kvm_vcpu *vcpu);
 void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event);
 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu);