diff --git a/repos/os/src/server/vmm/virtio_console.h b/repos/os/src/server/vmm/virtio_console.h
index 2bead217ce..dadb939aa0 100644
--- a/repos/os/src/server/vmm/virtio_console.h
+++ b/repos/os/src/server/vmm/virtio_console.h
@@ -64,6 +64,23 @@ class Vmm::Virtio_console : public Virtio_device<Virtio_split_queue, 2>
 
 		enum Device_id { CONSOLE = 0x3 };
 
+		struct Config_area : Reg
+		{
+			Register read(Address_range & range,  Cpu&) override
+			{
+				switch (range.start) {
+				case 4:   return 1; /* maximum ports */
+				default: ;
+				}
+				return 0;
+			}
+
+			void write(Address_range & range,  Cpu&, Register v) override {}
+
+			Config_area(Virtio_console & console)
+			: Reg(console, "ConfigArea", Mmio_register::RW, 0x100, 12) { }
+		} _config_area { *this };
+
 	public:
 
 		Virtio_console(const char * const name,
diff --git a/repos/os/src/server/vmm/virtio_device.h b/repos/os/src/server/vmm/virtio_device.h
index a4b4a52151..40c4276ad0 100644
--- a/repos/os/src/server/vmm/virtio_device.h
+++ b/repos/os/src/server/vmm/virtio_device.h
@@ -318,6 +318,13 @@ class Vmm::Virtio_device : public Vmm::Mmio_device, public Virtio_device_base
 		Set _device_low  { *this, _queue_sel, "QueueDeviceLow",  Reg::WO, 0xa0 };
 		Set _device_high { *this, _queue_sel, "QueueDeviceHigh", Reg::WO, 0xa4 };
 
+		Reg _shm_id        { *this, "SHMSel",           Reg::WO, 0xac };
+		Reg _shm_len_low   { *this, "SHMLenLow",        Reg::RO, 0xb0, 0xffffffff };
+		Reg _shm_len_high  { *this, "SHMLenHigh",       Reg::RO, 0xb4, 0xffffffff };
+		Reg _shm_base_low  { *this, "SHMBaseLow",       Reg::RO, 0xb8, 0xffffffff };
+		Reg _shm_base_high { *this, "SHMBaseHigh",      Reg::RO, 0xbc, 0xffffffff };
+		Reg _config_gen    { *this, "ConfigGeneration", Reg::RW, 0xfc, 0 };
+
 
 		uint64_t _descriptor_area() const
 		{
@@ -432,6 +439,7 @@ class Vmm::Virtio_device : public Vmm::Mmio_device, public Virtio_device_base
 		}
 
 		Genode::Mutex & mutex() { return _mutex; }
+		void config_has_changed() { _config_gen.set(_config_gen.get() + 1); }
 };
 
 #endif /* _VIRTIO_DEVICE_H_ */
diff --git a/repos/os/src/server/vmm/virtio_net.h b/repos/os/src/server/vmm/virtio_net.h
index 1d8395bd3e..c2624d1c74 100644
--- a/repos/os/src/server/vmm/virtio_net.h
+++ b/repos/os/src/server/vmm/virtio_net.h
@@ -130,8 +130,10 @@ class Vmm::Virtio_net : public Virtio_device<Virtio_split_queue, 2>
 				return mac.addr[range.start];
 			}
 
+			void write(Address_range & range,  Cpu&, Register v) override {}
+
 			Config_area(Virtio_net & device, Nic::Mac_address & mac)
-			: Reg(device, "ConfigArea", Mmio_register::RO, 0x100, 8),
+			: Reg(device, "ConfigArea", Mmio_register::RW, 0x100, 24),
 			  mac(mac)
 			{ }
 		} _config_area { *this, _mac };