diff --git a/backends/hostmem.c b/backends/hostmem.c
index ca10c51b51..e7eec3756a 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -257,15 +257,6 @@ static void host_memory_backend_init(Object *obj)
                         host_memory_backend_set_policy, NULL, NULL, NULL);
 }
 
-static void host_memory_backend_finalize(Object *obj)
-{
-    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
-
-    if (memory_region_size(&backend->mr)) {
-        memory_region_destroy(&backend->mr);
-    }
-}
-
 MemoryRegion *
 host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp)
 {
@@ -360,7 +351,6 @@ static const TypeInfo host_memory_backend_info = {
     .class_init = host_memory_backend_class_init,
     .instance_size = sizeof(HostMemoryBackend),
     .instance_init = host_memory_backend_init,
-    .instance_finalize = host_memory_backend_finalize,
     .interfaces = (InterfaceInfo[]) {
         { TYPE_USER_CREATABLE },
         { }
diff --git a/hw/audio/ac97.c b/hw/audio/ac97.c
index 45cb1185c5..0e22bb9fbd 100644
--- a/hw/audio/ac97.c
+++ b/hw/audio/ac97.c
@@ -1388,14 +1388,6 @@ static int ac97_initfn (PCIDevice *dev)
     return 0;
 }
 
-static void ac97_exitfn (PCIDevice *dev)
-{
-    AC97LinkState *s = DO_UPCAST (AC97LinkState, dev, dev);
-
-    memory_region_destroy (&s->io_nam);
-    memory_region_destroy (&s->io_nabm);
-}
-
 static int ac97_init (PCIBus *bus)
 {
     pci_create_simple (bus, -1, "AC97");
@@ -1413,7 +1405,6 @@ static void ac97_class_init (ObjectClass *klass, void *data)
     PCIDeviceClass *k = PCI_DEVICE_CLASS (klass);
 
     k->init = ac97_initfn;
-    k->exit = ac97_exitfn;
     k->vendor_id = PCI_VENDOR_ID_INTEL;
     k->device_id = PCI_DEVICE_ID_INTEL_82801AA_5;
     k->revision = 0x01;
diff --git a/hw/audio/es1370.c b/hw/audio/es1370.c
index 5dbf803817..e67d1ea165 100644
--- a/hw/audio/es1370.c
+++ b/hw/audio/es1370.c
@@ -1042,13 +1042,6 @@ static int es1370_initfn (PCIDevice *dev)
     return 0;
 }
 
-static void es1370_exitfn (PCIDevice *dev)
-{
-    ES1370State *s = DO_UPCAST (ES1370State, dev, dev);
-
-    memory_region_destroy (&s->io);
-}
-
 static int es1370_init (PCIBus *bus)
 {
     pci_create_simple (bus, -1, "ES1370");
@@ -1061,7 +1054,6 @@ static void es1370_class_init (ObjectClass *klass, void *data)
     PCIDeviceClass *k = PCI_DEVICE_CLASS (klass);
 
     k->init = es1370_initfn;
-    k->exit = es1370_exitfn;
     k->vendor_id = PCI_VENDOR_ID_ENSONIQ;
     k->device_id = PCI_DEVICE_ID_ENSONIQ_ES1370;
     k->class_id = PCI_CLASS_MULTIMEDIA_AUDIO;
diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
index aa49b47482..aba45fc8c8 100644
--- a/hw/audio/intel-hda.c
+++ b/hw/audio/intel-hda.c
@@ -1155,7 +1155,6 @@ static void intel_hda_exit(PCIDevice *pci)
     IntelHDAState *d = INTEL_HDA(pci);
 
     msi_uninit(&d->pci);
-    memory_region_destroy(&d->mmio);
 }
 
 static int intel_hda_post_load(void *opaque, int version)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 5fd8f89822..6d9a0651d8 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -839,7 +839,6 @@ static void nvme_exit(PCIDevice *pci_dev)
     g_free(n->cq);
     g_free(n->sq);
     msix_uninit_exclusive_bar(pci_dev);
-    memory_region_destroy(&n->iomem);
 }
 
 static Property nvme_props[] = {
diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c
index f9507b4e5a..2238f39579 100644
--- a/hw/block/pflash_cfi01.c
+++ b/hw/block/pflash_cfi01.c
@@ -781,7 +781,6 @@ static void pflash_cfi01_realize(DeviceState *dev, Error **errp)
 
         if (ret < 0) {
             vmstate_unregister_ram(&pfl->mem, DEVICE(pfl));
-            memory_region_destroy(&pfl->mem);
             error_setg(errp, "failed to read the initial flash content");
             return;
         }
diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c
index 8d4b828edf..e196f4d94c 100644
--- a/hw/block/pflash_cfi02.c
+++ b/hw/block/pflash_cfi02.c
@@ -617,7 +617,6 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp)
         ret = bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
         if (ret < 0) {
             vmstate_unregister_ram(&pfl->orig_mem, DEVICE(pfl));
-            memory_region_destroy(&pfl->orig_mem);
             error_setg(errp, "failed to read the initial flash content");
             return;
         }
diff --git a/hw/char/serial-pci.c b/hw/char/serial-pci.c
index c133c33e7a..f05c9b4d86 100644
--- a/hw/char/serial-pci.c
+++ b/hw/char/serial-pci.c
@@ -135,7 +135,6 @@ static void serial_pci_exit(PCIDevice *dev)
     SerialState *s = &pci->state;
 
     serial_exit_core(s);
-    memory_region_destroy(&s->io);
     qemu_free_irq(s->irq);
 }
 
@@ -149,10 +148,8 @@ static void multi_serial_pci_exit(PCIDevice *dev)
         s = pci->state + i;
         serial_exit_core(s);
         memory_region_del_subregion(&pci->iobar, &s->io);
-        memory_region_destroy(&s->io);
         g_free(pci->name[i]);
     }
-    memory_region_destroy(&pci->iobar);
     qemu_free_irqs(pci->irqs, pci->ports);
 }
 
diff --git a/hw/i386/kvm/pci-assign.c b/hw/i386/kvm/pci-assign.c
index de33657563..17c7d6dc2d 100644
--- a/hw/i386/kvm/pci-assign.c
+++ b/hw/i386/kvm/pci-assign.c
@@ -697,8 +697,6 @@ static void free_assigned_device(AssignedDevice *dev)
             if (region->u.r_baseport) {
                 memory_region_del_subregion(&region->container,
                                             &region->real_iomem);
-                memory_region_destroy(&region->real_iomem);
-                memory_region_destroy(&region->container);
             }
         } else if (pci_region->type & IORESOURCE_MEM) {
             if (region->u.r_virtbase) {
@@ -712,9 +710,6 @@ static void free_assigned_device(AssignedDevice *dev)
                     memory_region_del_subregion(&region->container,
                                                 &dev->mmio);
                 }
-
-                memory_region_destroy(&region->real_iomem);
-                memory_region_destroy(&region->container);
                 if (munmap(region->u.r_virtbase,
                            (pci_region->size + 0xFFF) & 0xFFFFF000)) {
                     error_report("Failed to unmap assigned device region: %s",
@@ -1680,8 +1675,6 @@ static void assigned_dev_unregister_msix_mmio(AssignedDevice *dev)
         return;
     }
 
-    memory_region_destroy(&dev->mmio);
-
     if (munmap(dev->msix_table, MSIX_PAGE_SIZE) == -1) {
         error_report("error unmapping msix_table! %s", strerror(errno));
     }
@@ -1953,7 +1946,6 @@ static void assigned_dev_load_option_rom(AssignedDevice *dev)
         error_printf("Device option ROM contents are probably invalid "
                      "(check dmesg).\nSkip option ROM probe with rombar=0, "
                      "or load from file with romfile=\n");
-        memory_region_destroy(&dev->dev.rom);
         goto close_rom;
     }
 
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 604152a823..aa0ef4233b 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -1197,8 +1197,6 @@ void ahci_init(AHCIState *s, DeviceState *qdev, AddressSpace *as, int ports)
 
 void ahci_uninit(AHCIState *s)
 {
-    memory_region_destroy(&s->mem);
-    memory_region_destroy(&s->idp);
     g_free(s->dev);
 }
 
diff --git a/hw/ide/cmd646.c b/hw/ide/cmd646.c
index a8e35fe38f..1295ed0f58 100644
--- a/hw/ide/cmd646.c
+++ b/hw/ide/cmd646.c
@@ -310,13 +310,8 @@ static void pci_cmd646_ide_exitfn(PCIDevice *dev)
 
     for (i = 0; i < 2; ++i) {
         memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].extra_io);
-        memory_region_destroy(&d->bmdma[i].extra_io);
         memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].addr_ioport);
-        memory_region_destroy(&d->bmdma[i].addr_ioport);
-        memory_region_destroy(&d->cmd646_bar[i].cmd);
-        memory_region_destroy(&d->cmd646_bar[i].data);
     }
-    memory_region_destroy(&d->bmdma_bar);
 }
 
 void pci_cmd646_ide_init(PCIBus *bus, DriveInfo **hd_table,
diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index 8651726f52..59319eb6c1 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -207,11 +207,8 @@ static void pci_piix_ide_exitfn(PCIDevice *dev)
 
     for (i = 0; i < 2; ++i) {
         memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].extra_io);
-        memory_region_destroy(&d->bmdma[i].extra_io);
         memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].addr_ioport);
-        memory_region_destroy(&d->bmdma[i].addr_ioport);
     }
-    memory_region_destroy(&d->bmdma_bar);
 }
 
 /* hd_table must contain 4 block drivers */
diff --git a/hw/ide/via.c b/hw/ide/via.c
index 198123b026..89d27b4c5b 100644
--- a/hw/ide/via.c
+++ b/hw/ide/via.c
@@ -198,11 +198,8 @@ static void vt82c686b_ide_exitfn(PCIDevice *dev)
 
     for (i = 0; i < 2; ++i) {
         memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].extra_io);
-        memory_region_destroy(&d->bmdma[i].extra_io);
         memory_region_del_subregion(&d->bmdma_bar, &d->bmdma[i].addr_ioport);
-        memory_region_destroy(&d->bmdma[i].addr_ioport);
     }
-    memory_region_destroy(&d->bmdma_bar);
 }
 
 void vt82c686b_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn)
diff --git a/hw/ipack/tpci200.c b/hw/ipack/tpci200.c
index 42ca923c7d..b7031a0b13 100644
--- a/hw/ipack/tpci200.c
+++ b/hw/ipack/tpci200.c
@@ -613,18 +613,6 @@ static int tpci200_initfn(PCIDevice *pci_dev)
     return 0;
 }
 
-static void tpci200_exitfn(PCIDevice *pci_dev)
-{
-    TPCI200State *s = TPCI200(pci_dev);
-
-    memory_region_destroy(&s->mmio);
-    memory_region_destroy(&s->io);
-    memory_region_destroy(&s->las0);
-    memory_region_destroy(&s->las1);
-    memory_region_destroy(&s->las2);
-    memory_region_destroy(&s->las3);
-}
-
 static const VMStateDescription vmstate_tpci200 = {
     .name = "tpci200",
     .version_id = 1,
@@ -645,7 +633,6 @@ static void tpci200_class_init(ObjectClass *klass, void *data)
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->init = tpci200_initfn;
-    k->exit = tpci200_exitfn;
     k->vendor_id = PCI_VENDOR_ID_TEWS;
     k->device_id = PCI_DEVICE_ID_TEWS_TPCI200;
     k->class_id = PCI_CLASS_BRIDGE_OTHER;
diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 768e5288bc..156edd2f17 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -789,11 +789,8 @@ static void pci_ivshmem_uninit(PCIDevice *dev)
         error_free(s->migration_blocker);
     }
 
-    memory_region_destroy(&s->ivshmem_mmio);
     memory_region_del_subregion(&s->bar, &s->ivshmem);
     vmstate_unregister_ram(&s->ivshmem, DEVICE(dev));
-    memory_region_destroy(&s->ivshmem);
-    memory_region_destroy(&s->bar);
     unregister_savevm(DEVICE(dev), "ivshmem", s);
 }
 
diff --git a/hw/misc/pci-testdev.c b/hw/misc/pci-testdev.c
index ca53b3f500..c78a63e3a7 100644
--- a/hw/misc/pci-testdev.c
+++ b/hw/misc/pci-testdev.c
@@ -293,8 +293,6 @@ pci_testdev_uninit(PCIDevice *dev)
         g_free(d->tests[i].hdr);
     }
     g_free(d->tests);
-    memory_region_destroy(&d->mmio);
-    memory_region_destroy(&d->portio);
 }
 
 static void qdev_pci_testdev_reset(DeviceState *dev)
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index af9ae1fedf..813c2cc5c5 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -2857,15 +2857,11 @@ static void vfio_unmap_bar(VFIODevice *vdev, int nr)
 
     memory_region_del_subregion(&bar->mem, &bar->mmap_mem);
     munmap(bar->mmap, memory_region_size(&bar->mmap_mem));
-    memory_region_destroy(&bar->mmap_mem);
 
     if (vdev->msix && vdev->msix->table_bar == nr) {
         memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem);
         munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem));
-        memory_region_destroy(&vdev->msix->mmap_mem);
     }
-
-    memory_region_destroy(&bar->mem);
 }
 
 static int vfio_mmap_bar(VFIODevice *vdev, VFIOBAR *bar,
@@ -3018,9 +3014,6 @@ static void vfio_unmap_bars(VFIODevice *vdev)
     if (vdev->has_vga) {
         vfio_vga_quirk_teardown(vdev);
         pci_unregister_vga(&vdev->pdev);
-        memory_region_destroy(&vdev->vga.region[QEMU_PCI_VGA_MEM].mem);
-        memory_region_destroy(&vdev->vga.region[QEMU_PCI_VGA_IO_LO].mem);
-        memory_region_destroy(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem);
     }
 }
 
diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index 0fc29a0ae3..21c38fa520 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -1496,8 +1496,6 @@ pci_e1000_uninit(PCIDevice *dev)
     timer_free(d->autoneg_timer);
     timer_del(d->mit_timer);
     timer_free(d->mit_timer);
-    memory_region_destroy(&d->mmio);
-    memory_region_destroy(&d->io);
     qemu_del_nic(d->nic);
 }
 
diff --git a/hw/net/eepro100.c b/hw/net/eepro100.c
index 3263e3fe90..3cd826accc 100644
--- a/hw/net/eepro100.c
+++ b/hw/net/eepro100.c
@@ -1843,9 +1843,6 @@ static void pci_nic_uninit(PCIDevice *pci_dev)
 {
     EEPRO100State *s = DO_UPCAST(EEPRO100State, dev, pci_dev);
 
-    memory_region_destroy(&s->mmio_bar);
-    memory_region_destroy(&s->io_bar);
-    memory_region_destroy(&s->flash_bar);
     vmstate_unregister(&pci_dev->qdev, s->vmstate, s);
     eeprom93xx_free(&pci_dev->qdev, s->eeprom);
     qemu_del_nic(s->nic);
diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
index d558b8c677..a62d12d92d 100644
--- a/hw/net/ne2000.c
+++ b/hw/net/ne2000.c
@@ -748,7 +748,6 @@ static void pci_ne2000_exit(PCIDevice *pci_dev)
     PCINE2000State *d = DO_UPCAST(PCINE2000State, dev, pci_dev);
     NE2000State *s = &d->ne2000;
 
-    memory_region_destroy(&s->io);
     qemu_del_nic(s->nic);
     qemu_free_irq(s->irq);
 }
diff --git a/hw/net/pcnet-pci.c b/hw/net/pcnet-pci.c
index b25d789d2c..50ffe914e0 100644
--- a/hw/net/pcnet-pci.c
+++ b/hw/net/pcnet-pci.c
@@ -282,8 +282,6 @@ static void pci_pcnet_uninit(PCIDevice *dev)
     PCIPCNetState *d = PCI_PCNET(dev);
 
     qemu_free_irq(d->state.irq);
-    memory_region_destroy(&d->state.mmio);
-    memory_region_destroy(&d->io_bar);
     timer_del(d->state.poll_timer);
     timer_free(d->state.poll_timer);
     qemu_del_nic(d->state.nic);
diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index 90bc5ecdd3..6e59f3819b 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -3462,8 +3462,6 @@ static void pci_rtl8139_uninit(PCIDevice *dev)
 {
     RTL8139State *s = RTL8139(dev);
 
-    memory_region_destroy(&s->bar_io);
-    memory_region_destroy(&s->bar_mem);
     if (s->cplus_txbuffer) {
         g_free(s->cplus_txbuffer);
         s->cplus_txbuffer = NULL;
diff --git a/hw/net/stellaris_enet.c b/hw/net/stellaris_enet.c
index c9ee5d3f10..c07e5137c2 100644
--- a/hw/net/stellaris_enet.c
+++ b/hw/net/stellaris_enet.c
@@ -485,13 +485,6 @@ static int stellaris_enet_init(SysBusDevice *sbd)
     return 0;
 }
 
-static void stellaris_enet_unrealize(DeviceState *dev, Error **errp)
-{
-    stellaris_enet_state *s = STELLARIS_ENET(dev);
-
-    memory_region_destroy(&s->mmio);
-}
-
 static Property stellaris_enet_properties[] = {
     DEFINE_NIC_PROPERTIES(stellaris_enet_state, conf),
     DEFINE_PROP_END_OF_LIST(),
@@ -503,7 +496,6 @@ static void stellaris_enet_class_init(ObjectClass *klass, void *data)
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
     k->init = stellaris_enet_init;
-    dc->unrealize = stellaris_enet_unrealize;
     dc->props = stellaris_enet_properties;
     dc->vmsd = &vmstate_stellaris_enet;
 }
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 77bea6f89f..f11525cef2 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -2182,10 +2182,6 @@ static void vmxnet3_pci_uninit(PCIDevice *pci_dev)
     vmxnet3_cleanup_msix(s);
 
     vmxnet3_cleanup_msi(s);
-
-    memory_region_destroy(&s->bar0);
-    memory_region_destroy(&s->bar1);
-    memory_region_destroy(&s->msix_bar);
 }
 
 static void vmxnet3_qdev_reset(DeviceState *dev)
diff --git a/hw/pci-bridge/pci_bridge_dev.c b/hw/pci-bridge/pci_bridge_dev.c
index e68145c52f..92799d08ef 100644
--- a/hw/pci-bridge/pci_bridge_dev.c
+++ b/hw/pci-bridge/pci_bridge_dev.c
@@ -81,7 +81,6 @@ msi_error:
 slotid_error:
     shpc_cleanup(dev, &bridge_dev->bar);
 shpc_error:
-    memory_region_destroy(&bridge_dev->bar);
     pci_bridge_exitfn(dev);
 bridge_error:
     return err;
@@ -95,7 +94,6 @@ static void pci_bridge_dev_exitfn(PCIDevice *dev)
     }
     slotid_cap_cleanup(dev);
     shpc_cleanup(dev, &bridge_dev->bar);
-    memory_region_destroy(&bridge_dev->bar);
     pci_bridge_exitfn(dev);
 }
 
diff --git a/hw/pci/msix.c b/hw/pci/msix.c
index 5c49bfc304..3c07d226b2 100644
--- a/hw/pci/msix.c
+++ b/hw/pci/msix.c
@@ -319,7 +319,6 @@ int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries,
                     bar_nr, MSIX_EXCLUSIVE_BAR_PBA_OFFSET,
                     MSIX_EXCLUSIVE_CAP_OFFSET);
     if (ret) {
-        memory_region_destroy(&dev->msix_exclusive_bar);
         return ret;
     }
 
@@ -359,11 +358,9 @@ void msix_uninit(PCIDevice *dev, MemoryRegion *table_bar, MemoryRegion *pba_bar)
     msix_free_irq_entries(dev);
     dev->msix_entries_nr = 0;
     memory_region_del_subregion(pba_bar, &dev->msix_pba_mmio);
-    memory_region_destroy(&dev->msix_pba_mmio);
     g_free(dev->msix_pba);
     dev->msix_pba = NULL;
     memory_region_del_subregion(table_bar, &dev->msix_table_mmio);
-    memory_region_destroy(&dev->msix_table_mmio);
     g_free(dev->msix_table);
     dev->msix_table = NULL;
     g_free(dev->msix_entry_used);
@@ -375,7 +372,6 @@ void msix_uninit_exclusive_bar(PCIDevice *dev)
 {
     if (msix_present(dev)) {
         msix_uninit(dev, &dev->msix_exclusive_bar, &dev->msix_exclusive_bar);
-        memory_region_destroy(&dev->msix_exclusive_bar);
     }
 }
 
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 351d320470..daeaeac85a 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -799,7 +799,6 @@ static void do_pci_unregister_device(PCIDevice *pci_dev)
     pci_config_free(pci_dev);
 
     address_space_destroy(&pci_dev->bus_master_as);
-    memory_region_destroy(&pci_dev->bus_master_enable_region);
 }
 
 /* -1 for devfn means auto assign */
@@ -1996,7 +1995,6 @@ static void pci_del_option_rom(PCIDevice *pdev)
         return;
 
     vmstate_unregister_ram(&pdev->rom, &pdev->qdev);
-    memory_region_destroy(&pdev->rom);
     pdev->has_rom = false;
 }
 
diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
index 4becdc14b8..13072655f5 100644
--- a/hw/pci/pci_bridge.c
+++ b/hw/pci/pci_bridge.c
@@ -219,12 +219,6 @@ static void pci_bridge_region_del(PCIBridge *br, PCIBridgeWindows *w)
 
 static void pci_bridge_region_cleanup(PCIBridge *br, PCIBridgeWindows *w)
 {
-    memory_region_destroy(&w->alias_io);
-    memory_region_destroy(&w->alias_mem);
-    memory_region_destroy(&w->alias_pref_mem);
-    memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_IO_LO]);
-    memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_IO_HI]);
-    memory_region_destroy(&w->alias_vga[QEMU_PCI_VGA_MEM]);
     g_free(w);
 }
 
@@ -389,8 +383,6 @@ void pci_bridge_exitfn(PCIDevice *pci_dev)
     QLIST_REMOVE(&s->sec_bus, sibling);
     pci_bridge_region_del(s, s->windows);
     pci_bridge_region_cleanup(s, s->windows);
-    memory_region_destroy(&s->address_space_mem);
-    memory_region_destroy(&s->address_space_io);
     /* object_unparent() is called automatically during device deletion */
 }
 
diff --git a/hw/pci/pcie_host.c b/hw/pci/pcie_host.c
index 7c88a1d091..3db038fc7f 100644
--- a/hw/pci/pcie_host.c
+++ b/hw/pci/pcie_host.c
@@ -94,7 +94,6 @@ void pcie_host_mmcfg_unmap(PCIExpressHost *e)
 {
     if (e->base_addr != PCIE_BASE_ADDR_UNMAPPED) {
         memory_region_del_subregion(get_system_memory(), &e->mmio);
-        memory_region_destroy(&e->mmio);
         e->base_addr = PCIE_BASE_ADDR_UNMAPPED;
     }
 }
diff --git a/hw/pci/shpc.c b/hw/pci/shpc.c
index 180faa7adb..1fcb8c4d85 100644
--- a/hw/pci/shpc.c
+++ b/hw/pci/shpc.c
@@ -667,7 +667,6 @@ void shpc_cleanup(PCIDevice *d, MemoryRegion *bar)
     g_free(shpc->cmask);
     g_free(shpc->wmask);
     g_free(shpc->w1cmask);
-    memory_region_destroy(&shpc->mmio);
     g_free(shpc);
 }
 
diff --git a/hw/scsi/esp-pci.c b/hw/scsi/esp-pci.c
index 9971bbf92d..82795e68b8 100644
--- a/hw/scsi/esp-pci.c
+++ b/hw/scsi/esp-pci.c
@@ -378,7 +378,6 @@ static void esp_pci_scsi_uninit(PCIDevice *d)
     PCIESPState *pci = PCI_ESP(d);
 
     qemu_free_irq(pci->esp.irq);
-    memory_region_destroy(&pci->io);
 }
 
 static void esp_pci_class_init(ObjectClass *klass, void *data)
diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index 786d8483ec..513ea47e8a 100644
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -2072,15 +2072,6 @@ static const VMStateDescription vmstate_lsi_scsi = {
     }
 };
 
-static void lsi_scsi_uninit(PCIDevice *d)
-{
-    LSIState *s = LSI53C895A(d);
-
-    memory_region_destroy(&s->mmio_io);
-    memory_region_destroy(&s->ram_io);
-    memory_region_destroy(&s->io_io);
-}
-
 static const struct SCSIBusInfo lsi_scsi_info = {
     .tcq = true,
     .max_target = LSI_MAX_DEVS,
@@ -2134,7 +2125,6 @@ static void lsi_class_init(ObjectClass *klass, void *data)
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->init = lsi_scsi_init;
-    k->exit = lsi_scsi_uninit;
     k->vendor_id = PCI_VENDOR_ID_LSI_LOGIC;
     k->device_id = PCI_DEVICE_ID_LSI_53C895A;
     k->class_id = PCI_CLASS_STORAGE_SCSI;
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index c68a873f18..eedc9922a7 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -2129,9 +2129,6 @@ static void megasas_scsi_uninit(PCIDevice *d)
     if (megasas_use_msi(s)) {
         msi_uninit(d);
     }
-    memory_region_destroy(&s->mmio_io);
-    memory_region_destroy(&s->port_io);
-    memory_region_destroy(&s->queue_io);
 }
 
 static const struct SCSIBusInfo megasas_scsi_info = {
diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
index f9ed926bd1..5734d19789 100644
--- a/hw/scsi/vmw_pvscsi.c
+++ b/hw/scsi/vmw_pvscsi.c
@@ -1087,7 +1087,6 @@ pvscsi_init(PCIDevice *pci_dev)
     s->completion_worker = qemu_bh_new(pvscsi_process_completion_queue, s);
     if (!s->completion_worker) {
         pvscsi_cleanup_msi(s);
-        memory_region_destroy(&s->io_space);
         return -ENOMEM;
     }
 
@@ -1107,8 +1106,6 @@ pvscsi_uninit(PCIDevice *pci_dev)
     qemu_bh_delete(s->completion_worker);
 
     pvscsi_cleanup_msi(s);
-
-    memory_region_destroy(&s->io_space);
 }
 
 static void
diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index 6f0a4d2814..d398c16899 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -901,7 +901,6 @@ static void tpm_tis_uninitfn(Object *obj)
     TPMState *s = TPM(obj);
 
     memory_region_del_subregion(get_system_memory(), &s->mmio);
-    memory_region_destroy(&s->mmio);
 }
 
 static void tpm_tis_class_init(ObjectClass *klass, void *data)
diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index c3bf72cc17..ee5f112d65 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -1256,13 +1256,6 @@ static int usb_uhci_vt82c686b_initfn(PCIDevice *dev)
     return usb_uhci_common_initfn(dev);
 }
 
-static void usb_uhci_exit(PCIDevice *dev)
-{
-    UHCIState *s = DO_UPCAST(UHCIState, dev, dev);
-
-    memory_region_destroy(&s->io_bar);
-}
-
 static Property uhci_properties[] = {
     DEFINE_PROP_STRING("masterbus", UHCIState, masterbus),
     DEFINE_PROP_UINT32("firstport", UHCIState, firstport, 0),
@@ -1279,7 +1272,6 @@ static void uhci_class_init(ObjectClass *klass, void *data)
     UHCIInfo *info = data;
 
     k->init = info->initfn ? info->initfn : usb_uhci_common_initfn;
-    k->exit = info->unplug ? usb_uhci_exit : NULL;
     k->vendor_id = info->vendor_id;
     k->device_id = info->device_id;
     k->revision  = info->revision;
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 3007319740..ddb5da181c 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1020,10 +1020,7 @@ static int virtio_pci_init(PCIDevice *pci_dev)
 
 static void virtio_pci_exit(PCIDevice *pci_dev)
 {
-    VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
-
     msix_uninit_exclusive_bar(pci_dev);
-    memory_region_destroy(&proxy->bar);
 }
 
 static void virtio_pci_reset(DeviceState *qdev)
diff --git a/hw/watchdog/wdt_i6300esb.c b/hw/watchdog/wdt_i6300esb.c
index b3d6f39dd5..687c8b1d4a 100644
--- a/hw/watchdog/wdt_i6300esb.c
+++ b/hw/watchdog/wdt_i6300esb.c
@@ -425,13 +425,6 @@ static int i6300esb_init(PCIDevice *dev)
     return 0;
 }
 
-static void i6300esb_exit(PCIDevice *dev)
-{
-    I6300State *d = DO_UPCAST(I6300State, dev, dev);
-
-    memory_region_destroy(&d->io_mem);
-}
-
 static WatchdogTimerModel model = {
     .wdt_name = "i6300esb",
     .wdt_description = "Intel 6300ESB",
@@ -445,7 +438,6 @@ static void i6300esb_class_init(ObjectClass *klass, void *data)
     k->config_read = i6300esb_config_read;
     k->config_write = i6300esb_config_write;
     k->init = i6300esb_init;
-    k->exit = i6300esb_exit;
     k->vendor_id = PCI_VENDOR_ID_INTEL;
     k->device_id = PCI_DEVICE_ID_INTEL_ESB_9;
     k->class_id = PCI_CLASS_SYSTEM_OTHER;
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index be4220b415..c1bf357154 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -453,25 +453,6 @@ static int xen_pt_register_regions(XenPCIPassthroughState *s)
     return 0;
 }
 
-static void xen_pt_unregister_regions(XenPCIPassthroughState *s)
-{
-    XenHostPCIDevice *d = &s->real_device;
-    int i;
-
-    for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {
-        XenHostPCIIORegion *r = &d->io_regions[i];
-
-        if (r->base_addr == 0 || r->size == 0) {
-            continue;
-        }
-
-        memory_region_destroy(&s->bar[i]);
-    }
-    if (d->rom.base_addr && d->rom.size) {
-        memory_region_destroy(&s->rom);
-    }
-}
-
 /* region mapping */
 
 static int xen_pt_bar_from_region(XenPCIPassthroughState *s, MemoryRegion *mr)
@@ -810,7 +791,6 @@ static void xen_pt_unregister_device(PCIDevice *d)
     /* delete all emulated config registers */
     xen_pt_config_delete(s);
 
-    xen_pt_unregister_regions(s);
     memory_listener_unregister(&s->memory_listener);
     memory_listener_unregister(&s->io_listener);
 
diff --git a/hw/xen/xen_pt_msi.c b/hw/xen/xen_pt_msi.c
index 12b4c4560c..9ed9321c9f 100644
--- a/hw/xen/xen_pt_msi.c
+++ b/hw/xen/xen_pt_msi.c
@@ -593,7 +593,6 @@ int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base)
     return 0;
 
 error_out:
-    memory_region_destroy(&msix->mmio);
     g_free(s->msix);
     s->msix = NULL;
     return rc;
@@ -616,7 +615,6 @@ void xen_pt_msix_delete(XenPCIPassthroughState *s)
     }
 
     memory_region_del_subregion(&s->bar[msix->bar_index], &msix->mmio);
-    memory_region_destroy(&msix->mmio);
 
     g_free(s->msix);
     s->msix = NULL;
diff --git a/include/exec/memory.h b/include/exec/memory.h
index e2c8e3e0a6..5bd10d13f5 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -429,15 +429,6 @@ void memory_region_init_iommu(MemoryRegion *mr,
                               const char *name,
                               uint64_t size);
 
-/**
- * memory_region_destroy: Destroy a memory region and reclaim all resources.
- *
- * @mr: the region to be destroyed.  May not currently be a subregion
- *      (see memory_region_add_subregion()) or referenced in an alias
- *      (see memory_region_init_alias()).
- */
-void memory_region_destroy(MemoryRegion *mr);
-
 /**
  * memory_region_owner: get a memory region's owner.
  *
diff --git a/memory.c b/memory.c
index 23c5269b8e..f11c035f0e 100644
--- a/memory.c
+++ b/memory.c
@@ -1264,11 +1264,6 @@ static void memory_region_finalize(Object *obj)
     g_free(mr->ioeventfds);
 }
 
-void memory_region_destroy(MemoryRegion *mr)
-{
-}
-
-
 Object *memory_region_owner(MemoryRegion *mr)
 {
     Object *obj = OBJECT(mr);