device-assignment: introduce get_assigned_dev_id

index 975bf29..a2fa902 100644
@@ -823,6 +823,11 @@ static uint32_t calc_assigned_dev_id(uint16_t seg, uint8_t bus, uint8_t devfn)
     return (uint32_t)seg << 16 | (uint32_t)bus << 8 | (uint32_t)devfn;
 }
 
+static uint32_t get_assigned_dev_id(AssignedDevice *dev)
+{
+    return calc_assigned_dev_id(dev->h_segnr, dev->h_busnr, dev->h_devfn);
+}
+
 static void assign_failed_examine(AssignedDevice *dev)
 {
     char name[PATH_MAX], dir[PATH_MAX], driver[PATH_MAX] = {}, *ns;

@@ -886,8 +891,7 @@ static int assign_device(AssignedDevice *dev)
 #endif
 
     memset(&assigned_dev_data, 0, sizeof(assigned_dev_data));
-    assigned_dev_data.assigned_dev_id  =
-	calc_assigned_dev_id(dev->h_segnr, dev->h_busnr, dev->h_devfn);
+    assigned_dev_data.assigned_dev_id = get_assigned_dev_id(dev);
 #ifdef KVM_CAP_PCI_SEGMENT
     assigned_dev_data.segnr = dev->h_segnr;
 #endif

@@ -944,8 +948,7 @@ static int assign_irq(AssignedDevice *dev)
         return r;
 
     memset(&assigned_irq_data, 0, sizeof(assigned_irq_data));
-    assigned_irq_data.assigned_dev_id =
-        calc_assigned_dev_id(dev->h_segnr, dev->h_busnr, dev->h_devfn);
+    assigned_irq_data.assigned_dev_id = get_assigned_dev_id(dev);
     assigned_irq_data.guest_irq = irq;
     assigned_irq_data.host_irq = dev->real_device.irq;
 #ifdef KVM_CAP_ASSIGN_DEV_IRQ

@@ -985,8 +988,7 @@ static void deassign_device(AssignedDevice *dev)
     int r;
 
     memset(&assigned_dev_data, 0, sizeof(assigned_dev_data));
-    assigned_dev_data.assigned_dev_id  =
-	calc_assigned_dev_id(dev->h_segnr, dev->h_busnr, dev->h_devfn);
+    assigned_dev_data.assigned_dev_id = get_assigned_dev_id(dev);
 
     r = kvm_deassign_pci_device(kvm_context, &assigned_dev_data);
     if (r < 0)

@@ -1041,9 +1043,7 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev, unsigned int ctrl_pos)
     int r;
 
     memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
-    assigned_irq_data.assigned_dev_id  =
-        calc_assigned_dev_id(assigned_dev->h_segnr, assigned_dev->h_busnr,
-                (uint8_t)assigned_dev->h_devfn);
+    assigned_irq_data.assigned_dev_id = get_assigned_dev_id(assigned_dev);
 
     /* Some guests gratuitously disable MSI even if they're not using it,
      * try to catch this by only deassigning irqs if the guest is using

@@ -1133,8 +1133,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
         fprintf(stderr, "MSI-X entry number is zero!\n");
         return -EINVAL;
     }
-    msix_nr.assigned_dev_id = calc_assigned_dev_id(adev->h_segnr, adev->h_busnr,
-                                          (uint8_t)adev->h_devfn);
+    msix_nr.assigned_dev_id = get_assigned_dev_id(adev);
     msix_nr.entry_nr = entries_nr;
     r = kvm_assign_set_msix_nr(kvm_context, &msix_nr);
     if (r != 0) {

@@ -1205,9 +1204,7 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev, unsigned int ctrl_pos)
     int r;
 
     memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
-    assigned_irq_data.assigned_dev_id  =
-            calc_assigned_dev_id(assigned_dev->h_segnr, assigned_dev->h_busnr,
-                    (uint8_t)assigned_dev->h_devfn);
+    assigned_irq_data.assigned_dev_id = get_assigned_dev_id(assigned_dev);
 
     /* Some guests gratuitously disable MSIX even if they're not using it,
      * try to catch this by only deassigning irqs if the guest is using