diff --git a/hw/intc/s390_flic.c b/hw/intc/s390_flic.c
index 837158bdaf..d3938b332b 100644
--- a/hw/intc/s390_flic.c
+++ b/hw/intc/s390_flic.c
@@ -48,7 +48,7 @@ void s390_flic_init(void)
 
 static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
                                          uint8_t isc, bool swap,
-                                         bool is_maskable)
+                                         bool is_maskable, uint8_t flags)
 {
     /* nothing to do */
     return 0;
diff --git a/hw/intc/s390_flic_kvm.c b/hw/intc/s390_flic_kvm.c
index 0bcd49f08b..15ff534fd1 100644
--- a/hw/intc/s390_flic_kvm.c
+++ b/hw/intc/s390_flic_kvm.c
@@ -186,13 +186,14 @@ static int __get_all_irqs(KVMS390FLICState *flic,
 
 static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
                                         uint8_t isc, bool swap,
-                                        bool is_maskable)
+                                        bool is_maskable, uint8_t flags)
 {
     struct kvm_s390_io_adapter adapter = {
         .id = id,
         .isc = isc,
         .maskable = is_maskable,
         .swap = swap,
+        .flags = flags,
     };
     KVMS390FLICState *flic = KVM_S390_FLIC(fs);
     int r;
diff --git a/hw/s390x/css-bridge.c b/hw/s390x/css-bridge.c
index 823747fcd7..c4a9735d71 100644
--- a/hw/s390x/css-bridge.c
+++ b/hw/s390x/css-bridge.c
@@ -110,7 +110,7 @@ VirtualCssBus *virtual_css_bus_init(void)
     qbus_set_hotplug_handler(bus, dev, &error_abort);
 
     css_register_io_adapters(CSS_IO_ADAPTER_VIRTIO, true, false,
-                             &error_abort);
+                             0, &error_abort);
 
     return cbus;
  }
diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index d67fffae30..1fcbc84581 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -225,6 +225,7 @@ typedef struct IoAdapter {
     uint32_t id;
     uint8_t type;
     uint8_t isc;
+    uint8_t flags;
 } IoAdapter;
 
 typedef struct ChannelSubSys {
@@ -392,10 +393,12 @@ uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc)
  *
  * @swap: an indication if byte swap is needed.
  * @maskable: an indication if the adapter is subject to the mask operation.
+ * @flags: further characteristics of the adapter.
+ *         e.g. suppressible, an indication if the adapter is subject to AIS.
  * @errp: location to store error information.
  */
 void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable,
-                              Error **errp)
+                              uint8_t flags, Error **errp)
 {
     uint32_t id;
     int ret, isc;
@@ -413,12 +416,13 @@ void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable,
 
     for (isc = 0; isc <= MAX_ISC; isc++) {
         id = (type << 3) | isc;
-        ret = fsc->register_io_adapter(fs, id, isc, swap, maskable);
+        ret = fsc->register_io_adapter(fs, id, isc, swap, maskable, flags);
         if (ret == 0) {
             adapter = g_new0(IoAdapter, 1);
             adapter->id = id;
             adapter->isc = isc;
             adapter->type = type;
+            adapter->flags = flags;
             channel_subsys.io_adapters[type][isc] = adapter;
         } else {
             error_setg_errno(errp, -ret, "Unexpected error %d when "
diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 5651483781..b9603e7802 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -582,7 +582,8 @@ static int s390_pcihost_init(SysBusDevice *dev)
     QTAILQ_INIT(&s->pending_sei);
     QTAILQ_INIT(&s->zpci_devs);
 
-    css_register_io_adapters(CSS_IO_ADAPTER_PCI, true, false, &error_abort);
+    css_register_io_adapters(CSS_IO_ADAPTER_PCI, true, false,
+                             S390_ADAPTER_SUPPRESSIBLE, &error_abort);
 
     return 0;
 }
diff --git a/include/hw/s390x/css.h b/include/hw/s390x/css.h
index eb0e26f258..e028960885 100644
--- a/include/hw/s390x/css.h
+++ b/include/hw/s390x/css.h
@@ -167,7 +167,13 @@ typedef enum {
 
 uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc);
 void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable,
-                              Error **errp);
+                              uint8_t flags, Error **errp);
+
+#ifndef CONFIG_KVM
+#define S390_ADAPTER_SUPPRESSIBLE 0x01
+#else
+#define S390_ADAPTER_SUPPRESSIBLE KVM_S390_ADAPTER_SUPPRESSIBLE
+#endif
 
 #ifndef CONFIG_USER_ONLY
 SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid,
diff --git a/include/hw/s390x/s390_flic.h b/include/hw/s390x/s390_flic.h
index caa6fc608d..d4145ad8eb 100644
--- a/include/hw/s390x/s390_flic.h
+++ b/include/hw/s390x/s390_flic.h
@@ -56,7 +56,7 @@ typedef struct S390FLICStateClass {
     DeviceClass parent_class;
 
     int (*register_io_adapter)(S390FLICState *fs, uint32_t id, uint8_t isc,
-                               bool swap, bool maskable);
+                               bool swap, bool maskable, uint8_t flags);
     int (*io_adapter_map)(S390FLICState *fs, uint32_t id, uint64_t map_addr,
                           bool do_map);
     int (*add_adapter_routes)(S390FLICState *fs, AdapterRoutes *routes);