pc: migrate piix4 & ich9 MemHotplugState

Adds an optional subsection that allows to migrate current
state of acpi_memory_hotplug of ACPI PM device.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index a818bed0fb..0ecc241458 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -140,6 +140,23 @@ static int ich9_pm_post_load(void *opaque, int version_id)
      .offset     = vmstate_offset_pointer(_state, _field, uint8_t),  \
  }
 
+static bool vmstate_test_use_memhp(void *opaque)
+{
+    ICH9LPCPMRegs *s = opaque;
+    return s->acpi_memory_hotplug.is_enabled;
+}
+
+static const VMStateDescription vmstate_memhp_state = {
+    .name = "ich9_pm/memhp",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields      = (VMStateField[]) {
+        VMSTATE_MEMORY_HOTPLUG(acpi_memory_hotplug, ICH9LPCPMRegs),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 const VMStateDescription vmstate_ich9_pm = {
     .name = "ich9_pm",
     .version_id = 1,
@@ -156,6 +173,13 @@ const VMStateDescription vmstate_ich9_pm = {
         VMSTATE_UINT32(smi_en, ICH9LPCPMRegs),
         VMSTATE_UINT32(smi_sts, ICH9LPCPMRegs),
         VMSTATE_END_OF_LIST()
+    },
+    .subsections = (VMStateSubsection[]) {
+        {
+            .vmsd = &vmstate_memhp_state,
+            .needed = vmstate_test_use_memhp,
+        },
+        VMSTATE_END_OF_LIST()
     }
 };