The VM start time sent during handshake can be used by the introspection
tool as a session id.

We save this 'VM start time' with the snapshot in order to be sent again
to the introspection tool when the VM is restored from snapshot and the
introspection connection is reestablished.

Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 accel/kvm/vmi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/accel/kvm/vmi.c b/accel/kvm/vmi.c
index 1f3aff3bfe..e511558f3d 100644
--- a/accel/kvm/vmi.c
+++ b/accel/kvm/vmi.c
@@ -20,6 +20,7 @@
 #include "crypto/hash.h"
 #include "chardev/char.h"
 #include "chardev/char-fe.h"
+#include "migration/vmstate.h"
 
 #include "sysemu/vmi-intercept.h"
 #include "sysemu/vmi-handshake.h"
@@ -203,6 +204,16 @@ static void class_init(ObjectClass *oc, void *data)
     uc->can_be_deleted = introspection_can_be_deleted;
 }
 
+static const VMStateDescription vmstate_introspection = {
+    .name = "vm_introspection",
+    .minimum_version_id = 1,
+    .version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_INT64(vm_start_time, VMIntrospection),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static void instance_init(Object *obj)
 {
     VMIntrospectionClass *ic = VM_INTROSPECTION_CLASS(obj->class);
@@ -227,6 +238,8 @@ static void instance_init(Object *obj)
     object_property_add(obj, "unhook_timeout", "uint32",
                         prop_set_uint32, prop_get_uint32,
                         NULL, &i->unhook_timeout, NULL);
+
+    vmstate_register(NULL, 0, &vmstate_introspection, i);
 }
 
 static void disconnect_chardev(VMIntrospection *i)