hw/core/clock-vmstate: define a vmstate entry for clock state

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 20200406135251.157596-3-damien.hedde@greensocs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/core/Makefile.objs

@@ -21,6 +21,7 @@ common-obj-$(CONFIG_SOFTMMU) += null-machine.o
 common-obj-$(CONFIG_SOFTMMU) += loader.o
 common-obj-$(CONFIG_SOFTMMU) += machine-hmp-cmds.o
 common-obj-$(CONFIG_SOFTMMU) += numa.o
+common-obj-$(CONFIG_SOFTMMU) += clock-vmstate.o
 obj-$(CONFIG_SOFTMMU) += machine-qmp-cmds.o
 
 common-obj-$(CONFIG_EMPTY_SLOT) += empty_slot.o

hw/core/clock-vmstate.c

@@ -0,0 +1,25 @@
+/*
+ * Clock migration structure
+ *
+ * Copyright GreenSocs 2019-2020
+ *
+ * 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 "migration/vmstate.h"
+#include "hw/clock.h"
+
+const VMStateDescription vmstate_clock = {
+    .name = "clock",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT64(period, Clock),
+        VMSTATE_END_OF_LIST()
+    }
+};

include/hw/clock.h

@@ -74,6 +74,15 @@ struct Clock {
     QLIST_ENTRY(Clock) sibling;
 };
 
+/*
+ * vmstate description entry to be added in device vmsd.
+ */
+extern const VMStateDescription vmstate_clock;
+#define VMSTATE_CLOCK(field, state) \
+    VMSTATE_CLOCK_V(field, state, 0)
+#define VMSTATE_CLOCK_V(field, state, version) \
+    VMSTATE_STRUCT_POINTER_V(field, state, version, vmstate_clock, Clock)
+
 /**
  * clock_setup_canonical_path:
  * @clk: clock