machine: Replace has_dynamic_sysbus with list of allowed devices

The existing has_dynamic_sysbus flag makes the machine accept
every user-creatable sysbus device type on the command-line.
Replace it with a list of allowed device types, so machines can
easily accept some sysbus devices while rejecting others.

To keep exactly the same behavior as before, the existing
has_dynamic_sysbus=true assignments are replaced with a
TYPE_SYS_BUS_DEVICE entry on the allowed list.  Other patches
will replace the TYPE_SYS_BUS_DEVICE entries with more specific
lists of devices.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Marcel Apfelbaum <marcel@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: qemu-arm@nongnu.org
Cc: qemu-ppc@nongnu.org
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20171125151610.20547-2-ehabkost@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

1 files changed, 29 insertions, 14 deletions

diff --git a/hw/core/machine.c b/hw/core/machine.c
index c857f3f934..0320a8efa1 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -334,29 +334,44 @@ static bool machine_get_enforce_config_section(Object *obj, Error **errp)
     return ms->enforce_config_section;
 }
 
-static void error_on_sysbus_device(SysBusDevice *sbdev, void *opaque)
+void machine_class_allow_dynamic_sysbus_dev(MachineClass *mc, const char *type)
 {
-    error_report("Option '-device %s' cannot be handled by this machine",
-                 object_class_get_name(object_get_class(OBJECT(sbdev))));
-    exit(1);
+    strList *item = g_new0(strList, 1);
+
+    item->value = g_strdup(type);
+    item->next = mc->allowed_dynamic_sysbus_devices;
+    mc->allowed_dynamic_sysbus_devices = item;
 }
 
-static void machine_init_notify(Notifier *notifier, void *data)
+static void validate_sysbus_device(SysBusDevice *sbdev, void *opaque)
 {
-    Object *machine = qdev_get_machine();
-    ObjectClass *oc = object_get_class(machine);
-    MachineClass *mc = MACHINE_CLASS(oc);
+    MachineState *machine = opaque;
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
+    bool allowed = false;
+    strList *wl;
 
-    if (mc->has_dynamic_sysbus) {
-        /* Our machine can handle dynamic sysbus devices, we're all good */
-        return;
+    for (wl = mc->allowed_dynamic_sysbus_devices;
+         !allowed && wl;
+         wl = wl->next) {
+        allowed |= !!object_dynamic_cast(OBJECT(sbdev), wl->value);
     }
 
+    if (!allowed) {
+        error_report("Option '-device %s' cannot be handled by this machine",
+                     object_class_get_name(object_get_class(OBJECT(sbdev))));
+        exit(1);
+    }
+}
+
+static void machine_init_notify(Notifier *notifier, void *data)
+{
+    MachineState *machine = MACHINE(qdev_get_machine());
+
     /*
-     * Loop through all dynamically created devices and check whether there
-     * are sysbus devices among them. If there are, error out.
+     * Loop through all dynamically created sysbus devices and check if they are
+     * all allowed.  If a device is not allowed, error out.
      */
-    foreach_dynamic_sysbus_device(error_on_sysbus_device, NULL);
+    foreach_dynamic_sysbus_device(validate_sysbus_device, machine);
 }
 
 HotpluggableCPUList *machine_query_hotpluggable_cpus(MachineState *machine)