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[PULL 09/10] qdev-monitor: Check sysbus device type before creating it

From: Philippe Mathieu-Daudé
Subject: [PULL 09/10] qdev-monitor: Check sysbus device type before creating it
Date: Mon, 1 Nov 2021 19:42:58 +0100

From: Damien Hedde <damien.hedde@greensocs.com>

Add an early check to test if the requested sysbus device type
is allowed by the current machine before creating the device. This
impacts both -device cli option and device_add qmp command.

Before this patch, the check was done well after the device has
been created (in a machine init done notifier). We can now report
the error right away.

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20211029142258.484907-3-damien.hedde@greensocs.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
 softmmu/qdev-monitor.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c
index 4851de51a5c..e49d9773d2d 100644
--- a/softmmu/qdev-monitor.c
+++ b/softmmu/qdev-monitor.c
@@ -42,6 +42,7 @@
 #include "qemu/cutils.h"
 #include "hw/qdev-properties.h"
 #include "hw/clock.h"
+#include "hw/boards.h"
  * Aliases were a bad idea from the start.  Let's keep them
@@ -254,6 +255,16 @@ static DeviceClass *qdev_get_device_class(const char 
**driver, Error **errp)
         return NULL;
+    if (object_class_dynamic_cast(oc, TYPE_SYS_BUS_DEVICE)) {
+        /* sysbus devices need to be allowed by the machine */
+        MachineClass *mc = MACHINE_CLASS(object_get_class(qdev_get_machine()));
+        if (!device_type_is_dynamic_sysbus(mc, *driver)) {
+            error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
+                       "a dynamic sysbus device type for the machine");
+            return NULL;
+        }
+    }
     return dc;

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