diff --git a/src/conf/domain_addr.c b/src/conf/domain_addr.c
index 639168effac4c23b8df914bfc99b2c9a5563bcfb..0ae1ed93afb28380deced7ae3adebef20fba6429 100644
--- a/src/conf/domain_addr.c
+++ b/src/conf/domain_addr.c
@@ -355,6 +355,20 @@ virDomainPCIAddressBusSetModel(virDomainPCIAddressBusPtr bus,
 }
 
 
+bool
+virDomainPCIAddressBusIsFullyReserved(virDomainPCIAddressBusPtr bus)
+{
+    size_t i;
+
+    for (i = bus->minSlot; i <= bus->maxSlot; i++) {
+        if (!bus->slot[i].functions)
+            return false;
+    }
+
+    return true;
+}
+
+
 /* Ensure addr fits in the address set, by expanding it if needed
  *
  * Return value:
diff --git a/src/conf/domain_addr.h b/src/conf/domain_addr.h
index f884b8af2bb6909855bac7c167d5337d3f6d8279..c90a335919be8eb2010e7d52d1dfdbbc4a5bba01 100644
--- a/src/conf/domain_addr.h
+++ b/src/conf/domain_addr.h
@@ -141,6 +141,9 @@ int virDomainPCIAddressBusSetModel(virDomainPCIAddressBusPtr bus,
                                    virDomainControllerModelPCI model)
     ATTRIBUTE_NONNULL(1);
 
+bool virDomainPCIAddressBusIsFullyReserved(virDomainPCIAddressBusPtr bus)
+    ATTRIBUTE_NONNULL(1);
+
 bool virDomainPCIAddressSlotInUse(virDomainPCIAddressSetPtr addrs,
                                   virPCIDeviceAddressPtr addr)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 440a563166b7839450e5f8a3804097c2f548d802..235725199c575db11a25cd4aa178c758566b5b12 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -106,6 +106,7 @@ virDomainCCWAddressSetFree;
 virDomainCCWAddressValidate;
 virDomainGetBlkioParametersAssignFromDef;
 virDomainPCIAddressAsString;
+virDomainPCIAddressBusIsFullyReserved;
 virDomainPCIAddressBusSetModel;
 virDomainPCIAddressEnsureAddr;
 virDomainPCIAddressFlagsCompatible;
diff --git a/src/qemu/qemu_domain_address.c b/src/qemu/qemu_domain_address.c
index b5b863fe4d50bb5de352c4c0fa38e9e063f291a9..efc698da13433b2c1cbcdd03045054025e653d0b 100644
--- a/src/qemu/qemu_domain_address.c
+++ b/src/qemu/qemu_domain_address.c
@@ -1499,19 +1499,6 @@ qemuDomainValidateDevicePCISlotsChipsets(virDomainDefPtr def,
 }
 
 
-static bool
-qemuDomainPCIBusFullyReserved(virDomainPCIAddressBusPtr bus)
-{
-    size_t i;
-
-    for (i = bus->minSlot; i <= bus->maxSlot; i++)
-        if (!bus->slot[i].functions)
-            return false;
-
-    return true;
-}
-
-
 /*
  * This assigns static PCI slots to all configured devices.
  * The ordering here is chosen to match the ordering used
@@ -2043,7 +2030,7 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
             bool buses_reserved = true;
 
             for (i = 0; i < addrs->nbuses; i++) {
-                if (!qemuDomainPCIBusFullyReserved(&addrs->buses[i])) {
+                if (!virDomainPCIAddressBusIsFullyReserved(&addrs->buses[i])) {
                     buses_reserved = false;
                     break;
                 }