virtio-crypto: avoid one cryptodev device is used by multiple virtio crypto devices

Add the check condition for cryptodev device in order
to avoid one cryptodev device is used by multiple
virtio crypto devices.
Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/virtio/virtio-crypto.c

@@ -877,6 +877,20 @@ static void virtio_crypto_class_init(ObjectClass *klass, void *data)
     vdc->reset = virtio_crypto_reset;
 }
 
+static void
+virtio_crypto_check_cryptodev_is_used(Object *obj, const char *name,
+                                      Object *val, Error **errp)
+{
+    if (cryptodev_backend_is_used(CRYPTODEV_BACKEND(val))) {
+        char *path = object_get_canonical_path_component(val);
+        error_setg(errp,
+            "can't use already used cryptodev backend: %s", path);
+        g_free(path);
+    } else {
+        qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
+    }
+}
+
 static void virtio_crypto_instance_init(Object *obj)
 {
     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(obj);
@@ -890,7 +904,7 @@ static void virtio_crypto_instance_init(Object *obj)
     object_property_add_link(obj, "cryptodev",
                              TYPE_CRYPTODEV_BACKEND,
                              (Object **)&vcrypto->conf.cryptodev,
-                             qdev_prop_allow_set_link_before_realize,
+                             virtio_crypto_check_cryptodev_is_used,
                              OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
 }