[PATCH v3 09/11] hw/core: Add qdev stub for user-mode

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

While user-mode does not use peripherals (devices), it uses a
CPU which is a device.
In the next commit we will reduce the QAPI generated code for
user-mode. Since qdev.c calls qapi_event_send_device_deleted()
in device_finalize, let's add a stub for it.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
v3: Meson rebase
---
 stubs/qdev-system.c | 24 ++++++++++++++++++++++++
 stubs/meson.build   |  1 +
 2 files changed, 25 insertions(+)
 create mode 100644 stubs/qdev-system.c

diff --git a/stubs/qdev-system.c b/stubs/qdev-system.c
new file mode 100644
index 0000000000..2b4b54f621
--- /dev/null
+++ b/stubs/qdev-system.c
@@ -0,0 +1,24 @@
+/*
+ * QAPI qdev stubs
+ *
+ * Copyright (c) 2020 Red Hat, Inc.
+ *
+ * Author:
+ *   Philippe Mathieu-Daudé <philmd@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/qapi-events-qdev.h"
+
+void qapi_event_send_device_deleted(bool has_device,
+                                    const char *device, const char *path)
+{
+    /*
+     * Called in user-mode in fork() when a CPUState is qdev::finalize()'d.
+     * Simply ignore the QAPI event there.
+     */
+}
diff --git a/stubs/meson.build b/stubs/meson.build
index 2e231590e1..71d42c34d6 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -25,6 +25,7 @@ stub_ss.add(files('monitor.c'))
 stub_ss.add(files('monitor-core.c'))
 stub_ss.add(files('pci-bus.c'))
 stub_ss.add(files('pci-host-piix.c'))
+stub_ss.add(files('qdev-system.c'))
 stub_ss.add(files('qemu-timer-notify-cb.c'))
 stub_ss.add(files('qmp_memory_device.c'))
 stub_ss.add(files('qtest.c'))
-- 
2.26.2