diff --git a/PVE/Makefile b/PVE/Makefile
index dc173681..440fbe77 100644
--- a/PVE/Makefile
+++ b/PVE/Makefile
@@ -11,4 +11,5 @@ install:
 	$(MAKE) -C VZDump install
 	$(MAKE) -C API2 install
 	$(MAKE) -C CLI install
+	$(MAKE) -C QemuConfig install
 	$(MAKE) -C QemuServer install
diff --git a/PVE/QemuConfig.pm b/PVE/QemuConfig.pm
index ffdf9f03..b60cc398 100644
--- a/PVE/QemuConfig.pm
+++ b/PVE/QemuConfig.pm
@@ -3,6 +3,8 @@ package PVE::QemuConfig;
 use strict;
 use warnings;
 
+use Scalar::Util qw(blessed);
+
 use PVE::AbstractConfig;
 use PVE::INotify;
 use PVE::JSONSchema;
@@ -561,6 +563,19 @@ sub get_derived_property {
     }
 }
 
+sub write_config {
+    my ($class, $vmid, $conf) = @_;
+
+    # Dispatch to class the object was blessed with if caller invoked the method via the
+    # 'PVE::QemuConfig' class name explicitly. This is hack, but the code currently doesn't
+    # generally use blessed config objects. Safeguard against infinite recursion.
+    if (blessed($conf) && !blessed($class)) {
+	return $conf->write_config($vmid, $conf);
+    }
+
+    return $class->SUPER::write_config($vmid, $conf);
+}
+
 # END implemented abstract methods from PVE::AbstractConfig
 
 sub has_cloudinit {
diff --git a/PVE/QemuConfig/Makefile b/PVE/QemuConfig/Makefile
new file mode 100644
index 00000000..c3a0d277
--- /dev/null
+++ b/PVE/QemuConfig/Makefile
@@ -0,0 +1,5 @@
+SOURCES=NoWrite.pm
+
+.PHONY: install
+install: ${SOURCES}
+	for i in ${SOURCES}; do install -D -m 0644 $$i ${DESTDIR}${PERLDIR}/PVE/QemuConfig/$$i; done
diff --git a/PVE/QemuConfig/NoWrite.pm b/PVE/QemuConfig/NoWrite.pm
new file mode 100644
index 00000000..f697506f
--- /dev/null
+++ b/PVE/QemuConfig/NoWrite.pm
@@ -0,0 +1,25 @@
+package PVE::QemuConfig::NoWrite;
+
+use strict;
+use warnings;
+
+use PVE::RESTEnvironment qw(log_warn);
+
+use base qw(PVE::QemuConfig);
+
+sub new {
+    my ($class, $conf) = @_;
+
+    bless($conf, $class);
+
+    return $conf;
+}
+
+sub write_config {
+    my ($class, $vmid, $conf) = @_;
+
+    log_warn("refusing to write temporary configuration");
+    return;
+}
+
+1;