3 files changed, 39 insertions, 1 deletions
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index a63b4e8c61..e340eab36b 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -193,6 +193,7 @@ static void ccw_machine_class_init(ObjectClass *oc, void *data)
     S390CcwMachineClass *s390mc = S390_MACHINE_CLASS(mc);
 
     s390mc->ri_allowed = true;
+    s390mc->cpu_model_allowed = true;
     mc->init = ccw_init;
     mc->reset = s390_machine_reset;
     mc->hot_add_cpu = s390_hot_add_cpu;
@@ -258,6 +259,19 @@ bool ri_allowed(void)
     return 0;
 }
 
+bool cpu_model_allowed(void)
+{
+    MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
+    if (object_class_dynamic_cast(OBJECT_CLASS(mc),
+                                  TYPE_S390_CCW_MACHINE)) {
+        S390CcwMachineClass *s390mc = S390_MACHINE_CLASS(mc);
+
+        return s390mc->cpu_model_allowed;
+    }
+    /* allow CPU model qmp queries with the "none" machine */
+    return true;
+}
+
 static inline void s390_machine_initfn(Object *obj)
 {
     object_property_add_bool(obj, "aes-key-wrap",
@@ -397,6 +411,9 @@ static void ccw_machine_2_7_instance_options(MachineState *machine)
 
 static void ccw_machine_2_7_class_options(MachineClass *mc)
 {
+    S390CcwMachineClass *s390mc = S390_MACHINE_CLASS(mc);
+
+    s390mc->cpu_model_allowed = false;
     ccw_machine_2_8_class_options(mc);
     SET_MACHINE_COMPAT(mc, CCW_COMPAT_2_7);
 }
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 9f3f386964..ee136ab940 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -455,6 +455,26 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             }
         }
         break;
+    case CCW_CMD_READ_STATUS:
+        if (check_len) {
+            if (ccw.count != sizeof(status)) {
+                ret = -EINVAL;
+                break;
+            }
+        } else if (ccw.count < sizeof(status)) {
+            /* Can't execute command. */
+            ret = -EINVAL;
+            break;
+        }
+        if (!ccw.cda) {
+            ret = -EFAULT;
+        } else {
+            address_space_stb(&address_space_memory, ccw.cda, vdev->status,
+                                        MEMTXATTRS_UNSPECIFIED, NULL);
+            sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status);;
+            ret = 0;
+        }
+        break;
     case CCW_CMD_WRITE_STATUS:
         if (check_len) {
             if (ccw.count != sizeof(status)) {
diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h
index b58ab21d4c..565094e4fb 100644
--- a/hw/s390x/virtio-ccw.h
+++ b/hw/s390x/virtio-ccw.h
@@ -45,6 +45,7 @@
 #define CCW_CMD_SET_IND      0x43
 #define CCW_CMD_SET_CONF_IND 0x53
 #define CCW_CMD_READ_VQ_CONF 0x32
+#define CCW_CMD_READ_STATUS  0x72
 #define CCW_CMD_SET_IND_ADAPTER 0x73
 #define CCW_CMD_SET_VIRTIO_REV 0x83
 
@@ -98,7 +99,7 @@ struct VirtioCcwDevice {
 };
 
 /* The maximum virtio revision we support. */
-#define VIRTIO_CCW_MAX_REV 1
+#define VIRTIO_CCW_MAX_REV 2
 static inline int virtio_ccw_rev_max(VirtioCcwDevice *dev)
 {
     return dev->max_rev;