[Qemu-devel] [RFC PATCH v2 06/12] add vmstate description for device reset state

[Damien Hedde <damien.hedde@greensocs.com>]

The `device_vmstate_reset` can be added by device specialization, as
vmsd subsection, to migrate the reset related device state part.

It contains the resetting counter and the reset inputs current status.

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
---
 hw/core/Makefile.objs  |  1 +
 hw/core/qdev-vmstate.c | 34 ++++++++++++++++++++++++++++++++++
 include/hw/qdev-core.h |  6 ++++++
 3 files changed, 41 insertions(+)
 create mode 100644 hw/core/qdev-vmstate.c

diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs
index 97007454a8..b3b4990005 100644
--- a/hw/core/Makefile.objs
+++ b/hw/core/Makefile.objs
@@ -4,6 +4,7 @@ common-obj-y += bus.o reset.o
 common-obj-y += resettable.o
 common-obj-$(CONFIG_SOFTMMU) += qdev-fw.o
 common-obj-$(CONFIG_SOFTMMU) += fw-path-provider.o
+common-obj-$(CONFIG_SOFTMMU) += qdev-vmstate.o
 # irq.o needed for qdev GPIO handling:
 common-obj-y += irq.o
 common-obj-y += hotplug.o
diff --git a/hw/core/qdev-vmstate.c b/hw/core/qdev-vmstate.c
new file mode 100644
index 0000000000..5322b70b0e
--- /dev/null
+++ b/hw/core/qdev-vmstate.c
@@ -0,0 +1,34 @@
+/*
+ * Device vmstate
+ *
+ * Copyright (c) 2019 GreenSocs
+ *
+ * Authors:
+ *   Damien Hedde
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/qdev.h"
+#include "migration/vmstate.h"
+
+static bool device_vmstate_reset_needed(void *opaque)
+{
+    DeviceState *dev = (DeviceState *) opaque;
+    return dev->resetting;
+}
+
+const struct VMStateDescription device_vmstate_reset = {
+    .name = "device_reset",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .needed = device_vmstate_reset_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(resetting, DeviceState),
+        VMSTATE_BOOL(cold_reset_input.state, DeviceState),
+        VMSTATE_BOOL(warm_reset_input.state, DeviceState),
+        VMSTATE_END_OF_LIST()
+    }
+};
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 693f79b385..596a5bbead 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -546,4 +546,10 @@ static inline bool qbus_is_hotpluggable(BusState *bus)
 void device_listener_register(DeviceListener *listener);
 void device_listener_unregister(DeviceListener *listener);
 
+/**
+ * device_vmstate_reset:
+ * vmstate entry for reset related state
+ */
+extern const struct VMStateDescription device_vmstate_reset;
+
 #endif
-- 
2.21.0