KVM: Split up MSI-X assigned device IRQ handler
Jan Kiszka [Mon, 12 Sep 2011 16:57:56 +0000 (18:57 +0200)]
The threaded IRQ handler for MSI-X has almost nothing in common with the
INTx/MSI handler. Move its code into a dedicated handler.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

virt/kvm/assigned-dev.c

index 84ead54..7debe8c 100644 (file)
@@ -58,8 +58,6 @@ static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
 static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
 {
        struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
-       u32 vector;
-       int index;
 
        if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
                spin_lock(&assigned_dev->intx_lock);
@@ -68,20 +66,28 @@ static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
                spin_unlock(&assigned_dev->intx_lock);
        }
 
-       if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
-               index = find_index_from_host_irq(assigned_dev, irq);
-               if (index >= 0) {
-                       vector = assigned_dev->
-                                       guest_msix_entries[index].vector;
-                       kvm_set_irq(assigned_dev->kvm,
-                                   assigned_dev->irq_source_id, vector, 1);
-               }
-       } else
+       kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
+                   assigned_dev->guest_irq, 1);
+
+       return IRQ_HANDLED;
+}
+
+#ifdef __KVM_HAVE_MSIX
+static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
+{
+       struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+       int index = find_index_from_host_irq(assigned_dev, irq);
+       u32 vector;
+
+       if (index >= 0) {
+               vector = assigned_dev->guest_msix_entries[index].vector;
                kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
-                           assigned_dev->guest_irq, 1);
+                           vector, 1);
+       }
 
        return IRQ_HANDLED;
 }
+#endif
 
 /* Ack the irq line for an assigned device */
 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
@@ -279,7 +285,7 @@ static int assigned_device_enable_host_msix(struct kvm *kvm,
 
        for (i = 0; i < dev->entries_nr; i++) {
                r = request_threaded_irq(dev->host_msix_entries[i].vector,
-                                        NULL, kvm_assigned_dev_thread,
+                                        NULL, kvm_assigned_dev_thread_msix,
                                         0, dev->irq_name, dev);
                if (r)
                        goto err;