diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 4c004f5..8c33352 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -812,12 +812,7 @@
     }
 
     pci_dev->bus = bus;
-    if (bus->iommu_fn) {
-        dma_as = bus->iommu_fn(bus, bus->iommu_opaque, devfn);
-    } else {
-        /* FIXME: inherit memory region from bus creator */
-        dma_as = &address_space_memory;
-    }
+    dma_as = pci_device_iommu_address_space(pci_dev);
 
     memory_region_init_alias(&pci_dev->bus_master_enable_region,
                              OBJECT(pci_dev), "bus master",
@@ -2239,6 +2234,23 @@
     k->props = pci_props;
 }
 
+AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
+{
+    PCIBus *bus = PCI_BUS(dev->bus);
+
+    if (bus->iommu_fn) {
+        return bus->iommu_fn(bus, bus->iommu_opaque, dev->devfn);
+    }
+
+    if (bus->parent_dev) {
+        /** We are ignoring the bus master DMA bit of the bridge
+         *  as it would complicate things such as VFIO for no good reason */
+        return pci_device_iommu_address_space(bus->parent_dev);
+    }
+
+    return &address_space_memory;
+}
+
 void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque)
 {
     bus->iommu_fn = fn;
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index ccec2ba..2374aa9 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -405,6 +405,7 @@
 
 typedef AddressSpace *(*PCIIOMMUFunc)(PCIBus *, void *, int);
 
+AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
 void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque);
 
 static inline void