+
+VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
+{
+ uintptr_t key = (uintptr_t)bus;
+ VTDBus *vtd_bus = g_hash_table_lookup(s->vtd_as_by_busptr, &key);
+ VTDAddressSpace *vtd_dev_as;
+
+ if (!vtd_bus) {
+ /* No corresponding free() */
+ vtd_bus = g_malloc0(sizeof(VTDBus) + sizeof(VTDAddressSpace *) * VTD_PCI_DEVFN_MAX);
+ vtd_bus->bus = bus;
+ key = (uintptr_t)bus;
+ g_hash_table_insert(s->vtd_as_by_busptr, &key, vtd_bus);
+ }
+
+ vtd_dev_as = vtd_bus->dev_as[devfn];
+
+ if (!vtd_dev_as) {
+ vtd_bus->dev_as[devfn] = vtd_dev_as = g_malloc0(sizeof(VTDAddressSpace));
+
+ vtd_dev_as->bus = bus;
+ vtd_dev_as->devfn = (uint8_t)devfn;
+ vtd_dev_as->iommu_state = s;
+ vtd_dev_as->context_cache_entry.context_cache_gen = 0;
+ memory_region_init_iommu(&vtd_dev_as->iommu, OBJECT(s),
+ &s->iommu_ops, "intel_iommu", UINT64_MAX);
+ address_space_init(&vtd_dev_as->as,
+ &vtd_dev_as->iommu, "intel_iommu");
+ }
+ return vtd_dev_as;
+}
+