KVM: ioapic/msi interrupt delivery consolidation

ioapic_deliver() and kvm_set_msi() have code duplication. Move
the code into ioapic_deliver_entry() function and call it from
both places.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 32 insertions, 29 deletions

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index d4a7948b010..b71c0442cec 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -142,54 +142,57 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 	}
 }
 
-static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
+int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e)
 {
-	union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
 	DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
-	struct kvm_vcpu *vcpu;
-	int vcpu_id, r = -1;
+	int i, r = -1;
 
-	ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
-		     "vector=%x trig_mode=%x\n",
-		     entry.fields.dest, entry.fields.dest_mode,
-		     entry.fields.delivery_mode, entry.fields.vector,
-		     entry.fields.trig_mode);
-
-	/* Always delivery PIT interrupt to vcpu 0 */
-#ifdef CONFIG_X86
-	if (irq == 0) {
-                bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
-		__set_bit(0, deliver_bitmask);
-        } else
-#endif
-		kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
+	kvm_get_intr_delivery_bitmask(kvm, e, deliver_bitmask);
 
 	if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
 		ioapic_debug("no target on destination\n");
-		return 0;
+		return r;
 	}
 
-	while ((vcpu_id = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
+	while ((i = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
 			< KVM_MAX_VCPUS) {
-		__clear_bit(vcpu_id, deliver_bitmask);
-		vcpu = ioapic->kvm->vcpus[vcpu_id];
+		struct kvm_vcpu *vcpu = kvm->vcpus[i];
+		__clear_bit(i, deliver_bitmask);
 		if (vcpu) {
 			if (r < 0)
 				r = 0;
-			r += kvm_apic_set_irq(vcpu,
-					entry.fields.vector,
-					entry.fields.trig_mode,
-					entry.fields.delivery_mode);
+			r += kvm_apic_set_irq(vcpu, e->fields.vector,
+					e->fields.delivery_mode,
+					e->fields.trig_mode);
 		} else
 			ioapic_debug("null destination vcpu: "
 				     "mask=%x vector=%x delivery_mode=%x\n",
-				     entry.fields.deliver_bitmask,
-				     entry.fields.vector,
-				     entry.fields.delivery_mode);
+				     e->fields.deliver_bitmask,
+				     e->fields.vector, e->fields.delivery_mode);
 	}
 	return r;
 }
 
+static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
+{
+	union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
+
+	ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
+		     "vector=%x trig_mode=%x\n",
+		     entry.fields.dest, entry.fields.dest_mode,
+		     entry.fields.delivery_mode, entry.fields.vector,
+		     entry.fields.trig_mode);
+
+#ifdef CONFIG_X86
+	/* Always delivery PIT interrupt to vcpu 0 */
+	if (irq == 0) {
+		entry.fields.dest_mode = 0; /* Physical mode. */
+		entry.fields.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
+	}
+#endif
+	return ioapic_deliver_entry(ioapic->kvm, &entry);
+}
+
 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
 {
 	u32 old_irr = ioapic->irr;