@@ -248,6 +248,8 @@ void qdev_prop_set_macaddr(DeviceState *dev, const char *name,
void qdev_prop_set_enum(DeviceState *dev, const char *name, int value);
void qdev_prop_register_global(GlobalProperty *prop);
+const GlobalProperty *qdev_find_global_prop(DeviceState *dev,
+ const char *name);
int qdev_prop_check_globals(void);
void qdev_prop_set_globals(DeviceState *dev);
void error_set_from_qdev_prop_error(Error **errp, int ret, DeviceState *dev,
@@ -25,6 +25,28 @@
#include "sysemu/iothread.h"
#include "sysemu/tpm_backend.h"
+static bool check_non_null(DeviceState *dev, const char *name,
+ const void *old_val, const char *new_val,
+ Error **errp)
+{
+ const GlobalProperty *prop = qdev_find_global_prop(dev, name);
+
+ if (!old_val) {
+ return true;
+ }
+
+ if (prop) {
+ error_setg(errp, "-global %s.%s=... conflicts with %s=%s",
+ prop->driver, prop->property, name, new_val);
+ } else {
+ /* Error message is vague, but a better one would be hard */
+ error_setg(errp, "%s=%s conflicts, and override is not implemented",
+ name, new_val);
+ }
+ return false;
+}
+
+
/* --- drive --- */
static void get_drive(Object *obj, Visitor *v, const char *name, void *opaque,
@@ -299,14 +321,16 @@ static void set_netdev(Object *obj, Visitor *v, const char *name,
}
for (i = 0; i < queues; i++) {
-
if (peers[i]->peer) {
err = -EEXIST;
goto out;
}
- if (ncs[i]) {
- err = -EINVAL;
+ /*
+ * TODO Should this really be an error? If no, the old value
+ * needs to be released before we store the new one.
+ */
+ if (!check_non_null(dev, name, ncs[i], str, errp)) {
goto out;
}
@@ -1181,6 +1181,23 @@ void qdev_prop_register_global(GlobalProperty *prop)
g_ptr_array_add(global_props(), prop);
}
+const GlobalProperty *qdev_find_global_prop(DeviceState *dev,
+ const char *name)
+{
+ GPtrArray *props = global_props();
+ const GlobalProperty *p;
+ int i;
+
+ for (i = 0; i < props->len; i++) {
+ p = g_ptr_array_index(props, i);
+ if (object_dynamic_cast(OBJECT(dev), p->driver)
+ && !strcmp(p->property, name)) {
+ return p;
+ }
+ }
+ return NULL;
+}
+
int qdev_prop_check_globals(void)
{
int i, ret = 0;
qdev_prop_set_netdev() fails when the property already has a non-null value. Seems to go back to commit 30c367ed44 "qdev-properties-system.c: Allow vlan or netdev for -device, not both", v1.7.0. Board code doesn't expect failure, and crashes: $ qemu-system-x86_64 --nodefaults -nic user -netdev user,id=nic0 -global e1000.netdev=nic0 Unexpected error in error_set_from_qdev_prop_error() at /work/armbru/qemu/hw/core/qdev-properties.c:1101: qemu-system-x86_64: Property 'e1000.netdev' doesn't take value '__org.qemu.nic0 ' Aborted (core dumped) -device and device_add handle the failure: $ qemu-system-x86_64 -nodefaults -netdev user,id=net0 -netdev user,id=net1 -device e1000,netdev=net0,netdev=net1 qemu-system-x86_64: -device e1000,netdev=net0,netdev=net1: Property 'e1000.netdev' doesn't take value 'net1' $ qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -netdev user,id=net0 -netdev user,id=net1 -global e1000.netdev=net0 QEMU 5.0.50 monitor - type 'help' for more information (qemu) qemu-system-x86_64: warning: netdev net0 has no peer qemu-system-x86_64: warning: netdev net1 has no peer device_add e1000,netdev=net1 Error: Property 'e1000.netdev' doesn't take value 'net1' Perhaps netdev property override could be made to work. Perhaps it should. I'm not the right guy to figure this out. What I can do is improve the error message a bit: (qemu) device_add e1000,netdev=net1 Error: -global e1000.netdev=... conflicts with netdev=net1 Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> --- include/hw/qdev-properties.h | 2 ++ hw/core/qdev-properties-system.c | 30 +++++++++++++++++++++++++++--- hw/core/qdev-properties.c | 17 +++++++++++++++++ 3 files changed, 46 insertions(+), 3 deletions(-)