[Qemu-devel] [PATCH] qdev: Skip non-existing properties when setting globals

[Eduardo Habkost]

This avoids QEMU from aborting on cases like this:

  $ ./install/bin/qemu-system-x86_64 -global cpu.foobar=5
  qemu-system-x86_64: Property '.foobar' not found
  Aborted (core dumped)

The code sets dev->not_used if the property is not found as an effort to
to allow errors to be reported even if the device is hotpluggable, but
it won't catch all errors. We can't know the property is not going to be
available for hotpluggable devices, unless we actually try to create the
device.

Signed-off-by: Eduardo Habkost <address@hidden>
---
 hw/core/qdev-properties.c      | 10 +++++++++-
 tests/test-qdev-global-props.c | 14 ++++++++++++--
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index 3d12560..8cd7c2a 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -976,6 +976,7 @@ void qdev_prop_set_globals_for_type(DeviceState *dev, const 
char *typename,
                                     Error **errp)
 {
     GlobalProperty *prop;
+    Object *obj = OBJECT(dev);
 
     QTAILQ_FOREACH(prop, &global_props, next) {
         Error *err = NULL;
@@ -983,8 +984,15 @@ void qdev_prop_set_globals_for_type(DeviceState *dev, 
const char *typename,
         if (strcmp(typename, prop->driver) != 0) {
             continue;
         }
+        if (!object_property_find(obj, prop->property, &err)) {
+            /* not_used doesn't default to true for hotpluggable devices,
+             * but in this case we know the property wasn't used when it could.
+             */
+            prop->not_used = true;
+            continue;
+        }
         prop->not_used = false;
-        object_property_parse(OBJECT(dev), prop->value, prop->property, &err);
+        object_property_parse(obj, prop->value, prop->property, &err);
         if (err != NULL) {
             error_propagate(errp, err);
             return;
diff --git a/tests/test-qdev-global-props.c b/tests/test-qdev-global-props.c
index 2bef04c..1ccc3e5 100644
--- a/tests/test-qdev-global-props.c
+++ b/tests/test-qdev-global-props.c
@@ -148,8 +148,9 @@ static void test_dynamic_globalprop(void)
 {
     MyType *mt;
     static GlobalProperty props[] = {
-        { TYPE_DYNAMIC_PROPS, "prop1", "101" },
-        { TYPE_DYNAMIC_PROPS, "prop2", "102" },
+        { TYPE_DYNAMIC_PROPS, "prop1", "101", true },
+        { TYPE_DYNAMIC_PROPS, "prop2", "102", true },
+        { TYPE_DYNAMIC_PROPS, "prop3", "103", true },
         { TYPE_DYNAMIC_PROPS"-bad", "prop3", "103", true },
         {}
     };
@@ -164,6 +165,15 @@ static void test_dynamic_globalprop(void)
     g_assert_cmpuint(mt->prop2, ==, 102);
     all_used = qdev_prop_check_global();
     g_assert_cmpuint(all_used, ==, 1);
+
+    /* prop1 */
+    g_assert(!props[0].not_used);
+    /* prop2 */
+    g_assert(!props[1].not_used);
+    /* TYPE_DYNAMIC_PROPS.prop3: non-existing property */
+    g_assert(props[2].not_used);
+    /* TYPE_DYNAMIC_PROPS-bad.prop3: non-existing class */
+    g_assert(props[3].not_used);
 }
 
 int main(int argc, char **argv)
-- 
1.9.0