KVM: x86: Add a wrapper to handle common case of IRQ delivery without dest_map

Turn kvm_irq_delivery_to_apic() into a wrapper that passes NULL for the
@dest_map param, as only the ugly I/O APIC RTC hackery needs to know which
vCPUs received the IRQ.

No functional change intended.

Link: https://patch.msgid.link/20251206004311.479939-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

arch/x86/kvm/hyperv.c

@@ -492,7 +492,7 @@ static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
 	irq.vector = vector;
 	irq.level = 1;
 
-	ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
+	ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq);
 	trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
 	return ret;
 }

arch/x86/kvm/ioapic.c

@@ -485,11 +485,11 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
 		 * if rtc_irq_check_coalesced returns false).
 		 */
 		BUG_ON(ioapic->rtc_status.pending_eoi != 0);
-		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
-					       &ioapic->rtc_status.dest_map);
+		ret = __kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
+						 &ioapic->rtc_status.dest_map);
 		ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret);
 	} else
-		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
+		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe);
 
 	if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG)
 		entry->fields.remote_irr = 1;

arch/x86/kvm/irq.c

@@ -235,7 +235,7 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
 
 	kvm_msi_to_lapic_irq(kvm, e, &irq);
 
-	return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
+	return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
 }
 
 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
@@ -258,7 +258,7 @@ int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
 
 		kvm_msi_to_lapic_irq(kvm, e, &irq);
 
-		if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL))
+		if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r))
 			return r;
 		break;
 

arch/x86/kvm/lapic.c

@@ -1175,8 +1175,9 @@ static inline bool kvm_apic_map_get_dest_lapic(struct kvm *kvm,
 	return true;
 }
 
-bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
-		struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map)
+static bool __kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
+					    struct kvm_lapic_irq *irq, int *r,
+					    struct dest_map *dest_map)
 {
 	struct kvm_apic_map *map;
 	unsigned long bitmap;
@@ -1212,6 +1213,13 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
 	return ret;
 }
 
+
+bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
+				   struct kvm_lapic_irq *irq, int *r)
+{
+	return __kvm_irq_delivery_to_apic_fast(kvm, src, irq, r, NULL);
+}
+
 /*
  * This routine tries to handle interrupts in posted mode, here is how
  * it deals with different cases:
@@ -1283,15 +1291,16 @@ bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
 }
 EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_intr_is_single_vcpu);
 
-int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
-			     struct kvm_lapic_irq *irq, struct dest_map *dest_map)
+int __kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
+			       struct kvm_lapic_irq *irq,
+			       struct dest_map *dest_map)
 {
 	int r = -1;
 	struct kvm_vcpu *vcpu, *lowest = NULL;
 	unsigned long i, dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)];
 	unsigned int dest_vcpus = 0;
 
-	if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
+	if (__kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
 		return r;
 
 	if (irq->dest_mode == APIC_DEST_PHYSICAL &&
@@ -1587,7 +1596,7 @@ void kvm_apic_send_ipi(struct kvm_lapic *apic, u32 icr_low, u32 icr_high)
 
 	trace_kvm_apic_ipi(icr_low, irq.dest_id);
 
-	kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
+	kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
 }
 EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_apic_send_ipi);
 
@@ -2556,7 +2565,7 @@ static int __kvm_x2apic_icr_write(struct kvm_lapic *apic, u64 data, bool fast)
 		kvm_icr_to_lapic_irq(apic, (u32)data, (u32)(data >> 32), &irq);
 
 		if (!kvm_irq_delivery_to_apic_fast(apic->vcpu->kvm, apic, &irq,
-						   &ignored, NULL))
+						   &ignored))
 			return -EWOULDBLOCK;
 
 		trace_kvm_apic_ipi((u32)data, irq.dest_id);

arch/x86/kvm/lapic.h

@@ -117,10 +117,18 @@ int kvm_alloc_apic_access_page(struct kvm *kvm);
 void kvm_inhibit_apic_access_page(struct kvm_vcpu *vcpu);
 
 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
-		struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map);
-int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
-			     struct kvm_lapic_irq *irq,
-			     struct dest_map *dest_map);
+				   struct kvm_lapic_irq *irq, int *r);
+int __kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
+			       struct kvm_lapic_irq *irq,
+			       struct dest_map *dest_map);
+
+static inline int kvm_irq_delivery_to_apic(struct kvm *kvm,
+					   struct kvm_lapic *src,
+					   struct kvm_lapic_irq *irq)
+{
+	return __kvm_irq_delivery_to_apic(kvm, src, irq, NULL);
+}
+
 void kvm_apic_send_ipi(struct kvm_lapic *apic, u32 icr_low, u32 icr_high);
 
 int kvm_apic_set_base(struct kvm_vcpu *vcpu, u64 value, bool host_initiated);

arch/x86/kvm/x86.c

@@ -10245,7 +10245,7 @@ static void kvm_pv_kick_cpu_op(struct kvm *kvm, int apicid)
 		.dest_id = apicid,
 	};
 
-	kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
+	kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq);
 }
 
 bool kvm_apicv_activated(struct kvm *kvm)

arch/x86/kvm/xen.c

@@ -626,7 +626,7 @@ void kvm_xen_inject_vcpu_vector(struct kvm_vcpu *v)
 	irq.delivery_mode = APIC_DM_FIXED;
 	irq.level = 1;
 
-	kvm_irq_delivery_to_apic(v->kvm, NULL, &irq, NULL);
+	kvm_irq_delivery_to_apic(v->kvm, NULL, &irq);
 }
 
 /*