diff --git a/hw/spapr_llan.c b/hw/spapr_llan.c
index 259774888..abe12973e 100644
--- a/hw/spapr_llan.c
+++ b/hw/spapr_llan.c
@@ -495,9 +495,7 @@ static VIOsPAPRDeviceInfo spapr_vlan = {
     .qdev.name = "spapr-vlan",
     .qdev.size = sizeof(VIOsPAPRVLANDevice),
     .qdev.props = (Property[]) {
-        DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x1000),
-        DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice, rtce_window_size,
-                           0x10000000),
+        DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev, 0x1000, 0x10000000),
         DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
         DEFINE_PROP_END_OF_LIST(),
     },
diff --git a/hw/spapr_vio.h b/hw/spapr_vio.h
index faa5d94d7..7eb536765 100644
--- a/hw/spapr_vio.h
+++ b/hw/spapr_vio.h
@@ -60,6 +60,11 @@ typedef struct VIOsPAPRDevice {
     VIOsPAPR_CRQ crq;
 } VIOsPAPRDevice;
 
+#define DEFINE_SPAPR_PROPERTIES(type, field, default_reg, default_dma_window) \
+        DEFINE_PROP_UINT32("reg", type, field.reg, default_reg), \
+        DEFINE_PROP_UINT32("dma-window", type, field.rtce_window_size, \
+                           default_dma_window)
+
 typedef struct VIOsPAPRBus {
     BusState bus;
     int irq;
diff --git a/hw/spapr_vscsi.c b/hw/spapr_vscsi.c
index d2d041522..6fc82f6bd 100644
--- a/hw/spapr_vscsi.c
+++ b/hw/spapr_vscsi.c
@@ -930,9 +930,7 @@ static VIOsPAPRDeviceInfo spapr_vscsi = {
     .qdev.name = "spapr-vscsi",
     .qdev.size = sizeof(VSCSIState),
     .qdev.props = (Property[]) {
-        DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x2000),
-        DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice,
-                           rtce_window_size, 0x10000000),
+        DEFINE_SPAPR_PROPERTIES(VSCSIState, vdev, 0x2000, 0x10000000),
         DEFINE_PROP_END_OF_LIST(),
     },
 };
diff --git a/hw/spapr_vty.c b/hw/spapr_vty.c
index 607b81b53..a9d4b035e 100644
--- a/hw/spapr_vty.c
+++ b/hw/spapr_vty.c
@@ -140,7 +140,7 @@ static VIOsPAPRDeviceInfo spapr_vty = {
     .qdev.name = "spapr-vty",
     .qdev.size = sizeof(VIOsPAPRVTYDevice),
     .qdev.props = (Property[]) {
-        DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0),
+        DEFINE_SPAPR_PROPERTIES(VIOsPAPRVTYDevice, sdev, 0, 0),
         DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),
         DEFINE_PROP_END_OF_LIST(),
     },