diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c
index 3d579e2..a440575 100644
--- a/hw/display/cirrus_vga.c
+++ b/hw/display/cirrus_vga.c
@@ -2967,7 +2967,7 @@ static int pci_cirrus_vga_initfn(PCIDevice *dev)
 
      /* setup PCI */
 
-    memory_region_init(&s->pci_bar, NULL, "cirrus-pci-bar0", 0x2000000);
+    memory_region_init(&s->pci_bar, OBJECT(dev), "cirrus-pci-bar0", 0x2000000);
 
     /* XXX: add byte swapping apertures */
     memory_region_add_subregion(&s->pci_bar, 0, &s->cirrus_linear_io);
diff --git a/hw/display/exynos4210_fimd.c b/hw/display/exynos4210_fimd.c
index b520f52..eb168ea 100644
--- a/hw/display/exynos4210_fimd.c
+++ b/hw/display/exynos4210_fimd.c
@@ -1908,7 +1908,7 @@ static int exynos4210_fimd_init(SysBusDevice *dev)
     sysbus_init_irq(dev, &s->irq[1]);
     sysbus_init_irq(dev, &s->irq[2]);
 
-    memory_region_init_io(&s->iomem, NULL, &exynos4210_fimd_mmio_ops, s,
+    memory_region_init_io(&s->iomem, OBJECT(s), &exynos4210_fimd_mmio_ops, s,
             "exynos4210.fimd", FIMD_REGS_SIZE);
     sysbus_init_mmio(dev, &s->iomem);
     s->console = graphic_console_init(DEVICE(dev), &exynos4210_fimd_ops, s);
diff --git a/hw/display/jazz_led.c b/hw/display/jazz_led.c
index e6a508e..7f82037 100644
--- a/hw/display/jazz_led.c
+++ b/hw/display/jazz_led.c
@@ -264,7 +264,7 @@ static int jazz_led_init(SysBusDevice *dev)
 {
     LedState *s = FROM_SYSBUS(LedState, dev);
 
-    memory_region_init_io(&s->iomem, NULL, &led_ops, s, "led", 1);
+    memory_region_init_io(&s->iomem, OBJECT(s), &led_ops, s, "led", 1);
     sysbus_init_mmio(dev, &s->iomem);
 
     s->con = graphic_console_init(DEVICE(dev), &jazz_led_ops, s);
diff --git a/hw/display/milkymist-tmu2.c b/hw/display/milkymist-tmu2.c
index 31da796..efda082 100644
--- a/hw/display/milkymist-tmu2.c
+++ b/hw/display/milkymist-tmu2.c
@@ -447,7 +447,7 @@ static int milkymist_tmu2_init(SysBusDevice *dev)
 
     sysbus_init_irq(dev, &s->irq);
 
-    memory_region_init_io(&s->regs_region, NULL, &tmu2_mmio_ops, s,
+    memory_region_init_io(&s->regs_region, OBJECT(s), &tmu2_mmio_ops, s,
             "milkymist-tmu2", R_MAX * 4);
     sysbus_init_mmio(dev, &s->regs_region);
 
diff --git a/hw/display/milkymist-vgafb.c b/hw/display/milkymist-vgafb.c
index b1f9c16..870b339 100644
--- a/hw/display/milkymist-vgafb.c
+++ b/hw/display/milkymist-vgafb.c
@@ -279,7 +279,7 @@ static int milkymist_vgafb_init(SysBusDevice *dev)
 {
     MilkymistVgafbState *s = FROM_SYSBUS(typeof(*s), dev);
 
-    memory_region_init_io(&s->regs_region, NULL, &vgafb_mmio_ops, s,
+    memory_region_init_io(&s->regs_region, OBJECT(s), &vgafb_mmio_ops, s,
             "milkymist-vgafb", R_MAX * 4);
     sysbus_init_mmio(dev, &s->regs_region);
 
diff --git a/hw/display/pl110.c b/hw/display/pl110.c
index 15c2f38..60afcf3 100644
--- a/hw/display/pl110.c
+++ b/hw/display/pl110.c
@@ -453,7 +453,7 @@ static int pl110_init(SysBusDevice *dev)
 {
     pl110_state *s = FROM_SYSBUS(pl110_state, dev);
 
-    memory_region_init_io(&s->iomem, NULL, &pl110_ops, s, "pl110", 0x1000);
+    memory_region_init_io(&s->iomem, OBJECT(s), &pl110_ops, s, "pl110", 0x1000);
     sysbus_init_mmio(dev, &s->iomem);
     sysbus_init_irq(dev, &s->irq);
     qdev_init_gpio_in(&s->busdev.qdev, pl110_mux_ctrl_set, 1);
diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index 3804fe2..3862d7a 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -1981,18 +1981,20 @@ static int qxl_init_common(PCIQXLDevice *qxl)
     pci_set_byte(&config[PCI_INTERRUPT_PIN], 1);
 
     qxl->rom_size = qxl_rom_size();
-    memory_region_init_ram(&qxl->rom_bar, NULL, "qxl.vrom", qxl->rom_size);
+    memory_region_init_ram(&qxl->rom_bar, OBJECT(qxl), "qxl.vrom",
+                           qxl->rom_size);
     vmstate_register_ram(&qxl->rom_bar, &qxl->pci.qdev);
     init_qxl_rom(qxl);
     init_qxl_ram(qxl);
 
     qxl->guest_surfaces.cmds = g_new0(QXLPHYSICAL, qxl->ssd.num_surfaces);
-    memory_region_init_ram(&qxl->vram_bar, NULL, "qxl.vram", qxl->vram_size);
+    memory_region_init_ram(&qxl->vram_bar, OBJECT(qxl), "qxl.vram",
+                           qxl->vram_size);
     vmstate_register_ram(&qxl->vram_bar, &qxl->pci.qdev);
-    memory_region_init_alias(&qxl->vram32_bar, NULL, "qxl.vram32", &qxl->vram_bar,
-                             0, qxl->vram32_size);
+    memory_region_init_alias(&qxl->vram32_bar, OBJECT(qxl), "qxl.vram32",
+                             &qxl->vram_bar, 0, qxl->vram32_size);
 
-    memory_region_init_io(&qxl->io_bar, NULL, &qxl_io_ops, qxl,
+    memory_region_init_io(&qxl->io_bar, OBJECT(qxl), &qxl_io_ops, qxl,
                           "qxl-ioports", io_size);
     if (qxl->id == 0) {
         vga_dirty_log_start(&qxl->vga);
@@ -2095,7 +2097,8 @@ static int qxl_init_secondary(PCIDevice *dev)
 
     qxl->id = device_id++;
     qxl_init_ramsize(qxl);
-    memory_region_init_ram(&qxl->vga.vram, NULL, "qxl.vgavram", qxl->vga.vram_size);
+    memory_region_init_ram(&qxl->vga.vram, OBJECT(dev), "qxl.vgavram",
+                           qxl->vga.vram_size);
     vmstate_register_ram(&qxl->vga.vram, &qxl->pci.qdev);
     qxl->vga.vram_ptr = memory_region_get_ram_ptr(&qxl->vga.vram);
     qxl->vga.con = graphic_console_init(DEVICE(dev), &qxl_ops, qxl);
diff --git a/hw/display/tcx.c b/hw/display/tcx.c
index 24b5478..9fd48b5 100644
--- a/hw/display/tcx.c
+++ b/hw/display/tcx.c
@@ -528,7 +528,7 @@ static int tcx_init1(SysBusDevice *dev)
     int size;
     uint8_t *vram_base;
 
-    memory_region_init_ram(&s->vram_mem, NULL, "tcx.vram",
+    memory_region_init_ram(&s->vram_mem, OBJECT(s), "tcx.vram",
                            s->vram_size * (1 + 4 + 4));
     vmstate_register_ram_global(&s->vram_mem);
     vram_base = memory_region_get_ram_ptr(&s->vram_mem);
@@ -536,21 +536,23 @@ static int tcx_init1(SysBusDevice *dev)
     /* 8-bit plane */
     s->vram = vram_base;
     size = s->vram_size;
-    memory_region_init_alias(&s->vram_8bit, NULL, "tcx.vram.8bit",
+    memory_region_init_alias(&s->vram_8bit, OBJECT(s), "tcx.vram.8bit",
                              &s->vram_mem, vram_offset, size);
     sysbus_init_mmio(dev, &s->vram_8bit);
     vram_offset += size;
     vram_base += size;
 
     /* DAC */
-    memory_region_init_io(&s->dac, NULL, &tcx_dac_ops, s, "tcx.dac", TCX_DAC_NREGS);
+    memory_region_init_io(&s->dac, OBJECT(s), &tcx_dac_ops, s,
+                          "tcx.dac", TCX_DAC_NREGS);
     sysbus_init_mmio(dev, &s->dac);
 
     /* TEC (dummy) */
-    memory_region_init_io(&s->tec, NULL, &dummy_ops, s, "tcx.tec", TCX_TEC_NREGS);
+    memory_region_init_io(&s->tec, OBJECT(s), &dummy_ops, s,
+                          "tcx.tec", TCX_TEC_NREGS);
     sysbus_init_mmio(dev, &s->tec);
     /* THC: NetBSD writes here even with 8-bit display: dummy */
-    memory_region_init_io(&s->thc24, NULL, &dummy_ops, s, "tcx.thc24",
+    memory_region_init_io(&s->thc24, OBJECT(s), &dummy_ops, s, "tcx.thc24",
                           TCX_THC_NREGS_24);
     sysbus_init_mmio(dev, &s->thc24);
 
@@ -559,7 +561,7 @@ static int tcx_init1(SysBusDevice *dev)
         size = s->vram_size * 4;
         s->vram24 = (uint32_t *)vram_base;
         s->vram24_offset = vram_offset;
-        memory_region_init_alias(&s->vram_24bit, NULL, "tcx.vram.24bit",
+        memory_region_init_alias(&s->vram_24bit, OBJECT(s), "tcx.vram.24bit",
                                  &s->vram_mem, vram_offset, size);
         sysbus_init_mmio(dev, &s->vram_24bit);
         vram_offset += size;
@@ -569,14 +571,14 @@ static int tcx_init1(SysBusDevice *dev)
         size = s->vram_size * 4;
         s->cplane = (uint32_t *)vram_base;
         s->cplane_offset = vram_offset;
-        memory_region_init_alias(&s->vram_cplane, NULL, "tcx.vram.cplane",
+        memory_region_init_alias(&s->vram_cplane, OBJECT(s), "tcx.vram.cplane",
                                  &s->vram_mem, vram_offset, size);
         sysbus_init_mmio(dev, &s->vram_cplane);
 
         s->con = graphic_console_init(DEVICE(dev), &tcx24_ops, s);
     } else {
         /* THC 8 bit (dummy) */
-        memory_region_init_io(&s->thc8, NULL, &dummy_ops, s, "tcx.thc8",
+        memory_region_init_io(&s->thc8, OBJECT(s), &dummy_ops, s, "tcx.thc8",
                               TCX_THC_NREGS_8);
         sysbus_init_mmio(dev, &s->thc8);
 
diff --git a/hw/dma/pl080.c b/hw/dma/pl080.c
index 588c7b2..7937c3e 100644
--- a/hw/dma/pl080.c
+++ b/hw/dma/pl080.c
@@ -359,7 +359,7 @@ static int pl08x_init(SysBusDevice *dev, int nchannels)
 {
     pl080_state *s = FROM_SYSBUS(pl080_state, dev);
 
-    memory_region_init_io(&s->iomem, NULL, &pl080_ops, s, "pl080", 0x1000);
+    memory_region_init_io(&s->iomem, OBJECT(s), &pl080_ops, s, "pl080", 0x1000);
     sysbus_init_mmio(dev, &s->iomem);
     sysbus_init_irq(dev, &s->irq);
     s->nchannels = nchannels;
diff --git a/hw/dma/pl330.c b/hw/dma/pl330.c
index b366f8a..ddcc413 100644
--- a/hw/dma/pl330.c
+++ b/hw/dma/pl330.c
@@ -1528,7 +1528,8 @@ static void pl330_realize(DeviceState *dev, Error **errp)
     PL330State *s = PL330(dev);
 
     sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq_abort);
-    memory_region_init_io(&s->iomem, NULL, &pl330_ops, s, "dma", PL330_IOMEM_SIZE);
+    memory_region_init_io(&s->iomem, OBJECT(s), &pl330_ops, s,
+                          "dma", PL330_IOMEM_SIZE);
     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
 
     s->timer = qemu_new_timer_ns(vm_clock, pl330_exec_cycle_timer, s);
diff --git a/hw/dma/puv3_dma.c b/hw/dma/puv3_dma.c
index 787e9a1..36004ae 100644
--- a/hw/dma/puv3_dma.c
+++ b/hw/dma/puv3_dma.c
@@ -80,7 +80,7 @@ static int puv3_dma_init(SysBusDevice *dev)
         s->reg_CFG[i] = 0x0;
     }
 
-    memory_region_init_io(&s->iomem, NULL, &puv3_dma_ops, s, "puv3_dma",
+    memory_region_init_io(&s->iomem, OBJECT(s), &puv3_dma_ops, s, "puv3_dma",
             PUV3_REGS_OFFSET);
     sysbus_init_mmio(dev, &s->iomem);
 
diff --git a/hw/dma/pxa2xx_dma.c b/hw/dma/pxa2xx_dma.c
index 43e2dc3..bc7bf4c 100644
--- a/hw/dma/pxa2xx_dma.c
+++ b/hw/dma/pxa2xx_dma.c
@@ -465,7 +465,7 @@ static int pxa2xx_dma_init(SysBusDevice *dev)
 
     qdev_init_gpio_in(&dev->qdev, pxa2xx_dma_request, PXA2XX_DMA_NUM_REQUESTS);
 
-    memory_region_init_io(&s->iomem, NULL, &pxa2xx_dma_ops, s,
+    memory_region_init_io(&s->iomem, OBJECT(s), &pxa2xx_dma_ops, s,
                           "pxa2xx.dma", 0x00010000);
     sysbus_init_mmio(dev, &s->iomem);
     sysbus_init_irq(dev, &s->irq);
diff --git a/hw/dma/sparc32_dma.c b/hw/dma/sparc32_dma.c
index 4abb024..be6275f 100644
--- a/hw/dma/sparc32_dma.c
+++ b/hw/dma/sparc32_dma.c
@@ -274,7 +274,8 @@ static int sparc32_dma_init1(SysBusDevice *dev)
     sysbus_init_irq(dev, &s->irq);
 
     reg_size = s->is_ledma ? DMA_ETH_SIZE : DMA_SIZE;
-    memory_region_init_io(&s->iomem, NULL, &dma_mem_ops, s, "dma", reg_size);
+    memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
+                          "dma", reg_size);
     sysbus_init_mmio(dev, &s->iomem);
 
     qdev_init_gpio_in(&dev->qdev, dma_set_irq, 1);
diff --git a/hw/dma/sun4m_iommu.c b/hw/dma/sun4m_iommu.c
index eafb991..edb93f3 100644
--- a/hw/dma/sun4m_iommu.c
+++ b/hw/dma/sun4m_iommu.c
@@ -349,7 +349,7 @@ static int iommu_init1(SysBusDevice *dev)
 
     sysbus_init_irq(dev, &s->irq);
 
-    memory_region_init_io(&s->iomem, NULL, &iommu_mem_ops, s, "iommu",
+    memory_region_init_io(&s->iomem, OBJECT(s), &iommu_mem_ops, s, "iommu",
                           IOMMU_NREGS * sizeof(uint32_t));
     sysbus_init_mmio(dev, &s->iomem);
 
diff --git a/hw/dma/xilinx_axidma.c b/hw/dma/xilinx_axidma.c
index bdce635..a48e3ba 100644
--- a/hw/dma/xilinx_axidma.c
+++ b/hw/dma/xilinx_axidma.c
@@ -590,7 +590,7 @@ static void xilinx_axidma_init(Object *obj)
     sysbus_init_irq(sbd, &s->streams[0].irq);
     sysbus_init_irq(sbd, &s->streams[1].irq);
 
-    memory_region_init_io(&s->iomem, NULL, &axidma_ops, s,
+    memory_region_init_io(&s->iomem, obj, &axidma_ops, s,
                           "xlnx.axi-dma", R_MAX * 4 * 2);
     sysbus_init_mmio(sbd, &s->iomem);
 }
