diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index 77d0c66635..c67acf58b5 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -21,6 +21,18 @@ void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
}
}
+void qdev_prop_allow_set_link_before_realize(Object *obj, const char *name,
+ Object *val, Error **errp)
+{
+ DeviceState *dev = DEVICE(obj);
+
+ if (dev->realized) {
+ error_setg(errp, "Attempt to set link property '%s' on device '%s' "
+ "(type '%s') after it was realized",
+ name, dev->id, object_get_typename(obj));
+ }
+}
+
void *qdev_get_prop_ptr(DeviceState *dev, Property *prop)
{
void *ptr = dev;
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 9f0a522ee8..97acf62906 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -98,6 +98,8 @@ static void bus_add_child(BusState *bus, DeviceState *child)
object_property_add_link(OBJECT(bus), name,
object_get_typename(OBJECT(child)),
(Object **)&kid->child,
+ NULL, /* read-only property */
+ 0, /* return ownership on prop deletion */
NULL);
}
@@ -824,7 +826,8 @@ static void device_initfn(Object *obj)
} while (class != object_class_by_name(TYPE_DEVICE));
object_property_add_link(OBJECT(dev), "parent_bus", TYPE_BUS,
- (Object **)&dev->parent_bus, &error_abort);
+ (Object **)&dev->parent_bus, NULL, 0,
+ &error_abort);
}
static void device_post_init(Object *obj)
@@ -944,7 +947,10 @@ static void qbus_initfn(Object *obj)
QTAILQ_INIT(&bus->children);
object_property_add_link(obj, QDEV_HOTPLUG_HANDLER_PROPERTY,
TYPE_HOTPLUG_HANDLER,
- (Object **)&bus->hotplug_handler, NULL);
+ (Object **)&bus->hotplug_handler,
+ object_property_allow_set_link,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ NULL);
object_property_add_bool(obj, "realized",
bus_get_realized, bus_set_realized, NULL);
}
diff --git a/hw/dma/xilinx_axidma.c b/hw/dma/xilinx_axidma.c
index 19f07b3b25..14b887bfa8 100644
--- a/hw/dma/xilinx_axidma.c
+++ b/hw/dma/xilinx_axidma.c
@@ -537,9 +537,15 @@ static void xilinx_axidma_realize(DeviceState *dev, Error **errp)
Error *local_errp = NULL;
object_property_add_link(OBJECT(ds), "dma", TYPE_XILINX_AXI_DMA,
- (Object **)&ds->dma, &local_errp);
+ (Object **)&ds->dma,
+ object_property_allow_set_link,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &local_errp);
object_property_add_link(OBJECT(cs), "dma", TYPE_XILINX_AXI_DMA,
- (Object **)&cs->dma, &local_errp);
+ (Object **)&cs->dma,
+ object_property_allow_set_link,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &local_errp);
if (local_errp) {
goto xilinx_axidma_realize_fail;
}
@@ -571,10 +577,16 @@ static void xilinx_axidma_init(Object *obj)
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
object_property_add_link(obj, "axistream-connected", TYPE_STREAM_SLAVE,
- (Object **)&s->tx_data_dev, &error_abort);
+ (Object **)&s->tx_data_dev,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &error_abort);
object_property_add_link(obj, "axistream-control-connected",
TYPE_STREAM_SLAVE,
- (Object **)&s->tx_control_dev, &error_abort);
+ (Object **)&s->tx_control_dev,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &error_abort);
object_initialize(&s->rx_data_dev, sizeof(s->rx_data_dev),
TYPE_XILINX_AXI_DMA_DATA_STREAM);
diff --git a/hw/net/xilinx_axienet.c b/hw/net/xilinx_axienet.c
index 0bd5eda199..839d97ca86 100644
--- a/hw/net/xilinx_axienet.c
+++ b/hw/net/xilinx_axienet.c
@@ -945,9 +945,15 @@ static void xilinx_enet_realize(DeviceState *dev, Error **errp)
Error *local_errp = NULL;
object_property_add_link(OBJECT(ds), "enet", "xlnx.axi-ethernet",
- (Object **) &ds->enet, &local_errp);
+ (Object **) &ds->enet,
+ object_property_allow_set_link,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &local_errp);
object_property_add_link(OBJECT(cs), "enet", "xlnx.axi-ethernet",
- (Object **) &cs->enet, &local_errp);
+ (Object **) &cs->enet,
+ object_property_allow_set_link,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &local_errp);
if (local_errp) {
goto xilinx_enet_realize_fail;
}
@@ -982,10 +988,16 @@ static void xilinx_enet_init(Object *obj)
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
object_property_add_link(obj, "axistream-connected", TYPE_STREAM_SLAVE,
- (Object **) &s->tx_data_dev, &error_abort);
+ (Object **) &s->tx_data_dev,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &error_abort);
object_property_add_link(obj, "axistream-control-connected",
TYPE_STREAM_SLAVE,
- (Object **) &s->tx_control_dev, &error_abort);
+ (Object **) &s->tx_control_dev,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &error_abort);
object_initialize(&s->rx_data_dev, sizeof(s->rx_data_dev),
TYPE_XILINX_AXI_ENET_DATA_STREAM);
diff --git a/hw/pcmcia/pxa2xx.c b/hw/pcmcia/pxa2xx.c
index 8f17596cc3..96f377453d 100644
--- a/hw/pcmcia/pxa2xx.c
+++ b/hw/pcmcia/pxa2xx.c
@@ -198,7 +198,9 @@ static void pxa2xx_pcmcia_initfn(Object *obj)
s->slot.irq = qemu_allocate_irqs(pxa2xx_pcmcia_set_irq, s, 1)[0];
object_property_add_link(obj, "card", TYPE_PCMCIA_CARD,
- (Object **)&s->card, NULL);
+ (Object **)&s->card,
+ NULL, /* read-only property */
+ 0, NULL);
}
/* Insert a new card into a slot */
diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index e4fc35366b..9c71afa031 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -313,7 +313,9 @@ static void s390_virtio_rng_instance_init(Object *obj)
object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
- (Object **)&dev->vdev.conf.rng, NULL);
+ (Object **)&dev->vdev.conf.rng,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
}
static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index a01801e342..2bf0af8f0a 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1272,7 +1272,9 @@ static void virtio_ccw_rng_instance_init(Object *obj)
object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
- (Object **)&dev->vdev.conf.rng, NULL);
+ (Object **)&dev->vdev.conf.rng,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
}
static Property virtio_ccw_rng_properties[] = {
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 7b91841a1d..ce97514b69 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1517,7 +1517,9 @@ static void virtio_rng_initfn(Object *obj)
object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
- (Object **)&dev->vdev.conf.rng, NULL);
+ (Object **)&dev->vdev.conf.rng,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
}
diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index a16e3bc52e..b6ab3610cb 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -162,6 +162,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
OBJECT(vrng->conf.default_backend),
NULL);
+ /* The child property took a reference, we can safely drop ours now */
+ object_unref(OBJECT(vrng->conf.default_backend));
+
object_property_set_link(OBJECT(dev),
OBJECT(vrng->conf.default_backend),
"rng", NULL);
@@ -223,7 +226,9 @@ static void virtio_rng_initfn(Object *obj)
VirtIORNG *vrng = VIRTIO_RNG(obj);
object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
- (Object **)&vrng->conf.rng, NULL);
+ (Object **)&vrng->conf.rng,
+ qdev_prop_allow_set_link_before_realize,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
}
static const TypeInfo virtio_rng_info = {
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 7bd2ea7736..dd2c70da36 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -54,6 +54,7 @@ struct QEMUMachine {
int qemu_register_machine(QEMUMachine *m);
#define TYPE_MACHINE "machine"
+#undef MACHINE /* BSD defines it and QEMU does not use it */
#define MACHINE(obj) \
OBJECT_CHECK(MachineState, (obj), TYPE_MACHINE)
#define MACHINE_GET_CLASS(obj) \
diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
index 3c000eea75..c46e908d71 100644
--- a/include/hw/qdev-properties.h
+++ b/include/hw/qdev-properties.h
@@ -204,4 +204,15 @@ void qdev_property_add_static(DeviceState *dev, Property *prop, Error **errp);
*/
void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
Error **errp);
+
+/**
+ * qdev_prop_allow_set_link_before_realize:
+ *
+ * Set the #Error object if an attempt is made to set the link after realize.
+ * This function should be used as the check() argument to
+ * object_property_add_link().
+ */
+void qdev_prop_allow_set_link_before_realize(Object *obj, const char *name,
+ Object *val, Error **errp);
+
#endif
diff --git a/include/qom/object.h b/include/qom/object.h
index 4cd77049e4..a641dcde10 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -1067,12 +1067,29 @@ Object *object_resolve_path_component(Object *parent, const gchar *part);
void object_property_add_child(Object *obj, const char *name,
Object *child, Error **errp);
+typedef enum {
+ /* Unref the link pointer when the property is deleted */
+ OBJ_PROP_LINK_UNREF_ON_RELEASE = 0x1,
+} ObjectPropertyLinkFlags;
+
+/**
+ * object_property_allow_set_link:
+ *
+ * The default implementation of the object_property_add_link() check()
+ * callback function. It allows the link property to be set and never returns
+ * an error.
+ */
+void object_property_allow_set_link(Object *, const char *,
+ Object *, Error **);
+
/**
* object_property_add_link:
* @obj: the object to add a property to
* @name: the name of the property
* @type: the qobj type of the link
* @child: a pointer to where the link object reference is stored
+ * @check: callback to veto setting or NULL if the property is read-only
+ * @flags: additional options for the link
* @errp: if an error occurs, a pointer to an area to store the area
*
* Links establish relationships between objects. Links are unidirectional
@@ -1081,13 +1098,23 @@ void object_property_add_child(Object *obj, const char *name,
*
* Links form the graph in the object model.
*
+ * The @check() callback is invoked when
+ * object_property_set_link() is called and can raise an error to prevent the
+ * link being set. If @check is NULL, the property is read-only
+ * and cannot be set.
+ *
* Ownership of the pointer that @child points to is transferred to the
* link property. The reference count for *@child is
* managed by the property from after the function returns till the
- * property is deleted with object_property_del().
+ * property is deleted with object_property_del(). If the
+ * @flags OBJ_PROP_LINK_UNREF_ON_RELEASE bit is set,
+ * the reference count is decremented when the property is deleted.
*/
void object_property_add_link(Object *obj, const char *name,
const char *type, Object **child,
+ void (*check)(Object *obj, const char *name,
+ Object *val, Error **errp),
+ ObjectPropertyLinkFlags flags,
Error **errp);
/**
diff --git a/qom/object.c b/qom/object.c
index a2a1ffa1b3..f4de619b7b 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -1023,10 +1023,23 @@ out:
g_free(type);
}
+void object_property_allow_set_link(Object *obj, const char *name,
+ Object *val, Error **errp)
+{
+ /* Allow the link to be set, always */
+}
+
+typedef struct {
+ Object **child;
+ void (*check)(Object *, const char *, Object *, Error **);
+ ObjectPropertyLinkFlags flags;
+} LinkProperty;
+
static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
- Object **child = opaque;
+ LinkProperty *lprop = opaque;
+ Object **child = lprop->child;
gchar *path;
if (*child) {
@@ -1039,65 +1052,119 @@ static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
}
}
+/*
+ * object_resolve_link:
+ *
+ * Lookup an object and ensure its type matches the link property type. This
+ * is similar to object_resolve_path() except type verification against the
+ * link property is performed.
+ *
+ * Returns: The matched object or NULL on path lookup failures.
+ */
+static Object *object_resolve_link(Object *obj, const char *name,
+ const char *path, Error **errp)
+{
+ const char *type;
+ gchar *target_type;
+ bool ambiguous = false;
+ Object *target;
+
+ /* Go from link to FOO. */
+ type = object_property_get_type(obj, name, NULL);
+ target_type = g_strndup(&type[5], strlen(type) - 6);
+ target = object_resolve_path_type(path, target_type, &ambiguous);
+
+ if (ambiguous) {
+ error_set(errp, QERR_AMBIGUOUS_PATH, path);
+ } else if (!target) {
+ target = object_resolve_path(path, &ambiguous);
+ if (target || ambiguous) {
+ error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
+ } else {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, path);
+ }
+ target = NULL;
+ }
+ g_free(target_type);
+
+ return target;
+}
+
static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
- Object **child = opaque;
- Object *old_target;
- bool ambiguous = false;
- const char *type;
- char *path;
- gchar *target_type;
+ Error *local_err = NULL;
+ LinkProperty *prop = opaque;
+ Object **child = prop->child;
+ Object *old_target = *child;
+ Object *new_target = NULL;
+ char *path = NULL;
- type = object_property_get_type(obj, name, NULL);
+ visit_type_str(v, &path, name, &local_err);
- visit_type_str(v, &path, name, errp);
-
- old_target = *child;
- *child = NULL;
-
- if (strcmp(path, "") != 0) {
- Object *target;
-
- /* Go from link to FOO. */
- target_type = g_strndup(&type[5], strlen(type) - 6);
- target = object_resolve_path_type(path, target_type, &ambiguous);
-
- if (ambiguous) {
- error_set(errp, QERR_AMBIGUOUS_PATH, path);
- } else if (target) {
- object_ref(target);
- *child = target;
- } else {
- target = object_resolve_path(path, &ambiguous);
- if (target || ambiguous) {
- error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
- } else {
- error_set(errp, QERR_DEVICE_NOT_FOUND, path);
- }
- }
- g_free(target_type);
+ if (!local_err && strcmp(path, "") != 0) {
+ new_target = object_resolve_link(obj, name, path, &local_err);
}
g_free(path);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ prop->check(obj, name, new_target, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ if (new_target) {
+ object_ref(new_target);
+ }
+ *child = new_target;
if (old_target != NULL) {
object_unref(old_target);
}
}
+static void object_release_link_property(Object *obj, const char *name,
+ void *opaque)
+{
+ LinkProperty *prop = opaque;
+
+ if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
+ object_unref(*prop->child);
+ }
+ g_free(prop);
+}
+
void object_property_add_link(Object *obj, const char *name,
const char *type, Object **child,
+ void (*check)(Object *, const char *,
+ Object *, Error **),
+ ObjectPropertyLinkFlags flags,
Error **errp)
{
+ Error *local_err = NULL;
+ LinkProperty *prop = g_malloc(sizeof(*prop));
gchar *full_type;
+ prop->child = child;
+ prop->check = check;
+ prop->flags = flags;
+
full_type = g_strdup_printf("link<%s>", type);
object_property_add(obj, name, full_type,
object_get_link_property,
- object_set_link_property,
- NULL, child, errp);
+ check ? object_set_link_property : NULL,
+ object_release_link_property,
+ prop,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ g_free(prop);
+ }
g_free(full_type);
}
diff --git a/ui/console.c b/ui/console.c
index 4df251d579..e057755c04 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -1180,7 +1180,10 @@ static QemuConsole *new_console(DisplayState *ds, console_type_t console_type)
obj = object_new(TYPE_QEMU_CONSOLE);
s = QEMU_CONSOLE(obj);
object_property_add_link(obj, "device", TYPE_DEVICE,
- (Object **)&s->device, &local_err);
+ (Object **)&s->device,
+ object_property_allow_set_link,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &local_err);
object_property_add_uint32_ptr(obj, "head",
&s->head, &local_err);
diff --git a/vl.c b/vl.c
index f0fe48b106..e2e2ac799e 100644
--- a/vl.c
+++ b/vl.c
@@ -58,6 +58,7 @@ int main(int argc, char **argv)
#include
+#include "qemu/sockets.h"
#include "hw/hw.h"
#include "hw/boards.h"
#include "hw/usb.h"
@@ -103,7 +104,6 @@ int main(int argc, char **argv)
#include "disas/disas.h"
-#include "qemu/sockets.h"
#include "slirp/libslirp.h"
@@ -1587,14 +1587,16 @@ static void machine_class_init(ObjectClass *oc, void *data)
int qemu_register_machine(QEMUMachine *m)
{
+ char *name = g_strconcat(m->name, TYPE_MACHINE_SUFFIX, NULL);
TypeInfo ti = {
- .name = g_strconcat(m->name, TYPE_MACHINE_SUFFIX, NULL),
+ .name = name,
.parent = TYPE_MACHINE,
.class_init = machine_class_init,
.class_data = (void *)m,
};
type_register(&ti);
+ g_free(name);
return 0;
}