diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index fa6fd0e..2a21150 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -987,7 +987,8 @@ static const VMStateDescription vmstate_virtio_gpu_scanouts = {
     },
 };
 
-static void virtio_gpu_save(QEMUFile *f, void *opaque, size_t size)
+static void virtio_gpu_save(QEMUFile *f, void *opaque, size_t size,
+                            VMStateField *field, QJSON *vmdesc)
 {
     VirtIOGPU *g = opaque;
     struct virtio_gpu_simple_resource *res;
@@ -1014,7 +1015,8 @@ static void virtio_gpu_save(QEMUFile *f, void *opaque, size_t size)
     vmstate_save_state(f, &vmstate_virtio_gpu_scanouts, g, NULL);
 }
 
-static int virtio_gpu_load(QEMUFile *f, void *opaque, size_t size)
+static int virtio_gpu_load(QEMUFile *f, void *opaque, size_t size,
+                           VMStateField *field)
 {
     VirtIOGPU *g = opaque;
     struct virtio_gpu_simple_resource *res;
diff --git a/hw/intc/s390_flic_kvm.c b/hw/intc/s390_flic_kvm.c
index 21ac2e2..a80a812 100644
--- a/hw/intc/s390_flic_kvm.c
+++ b/hw/intc/s390_flic_kvm.c
@@ -286,7 +286,8 @@ static void kvm_s390_release_adapter_routes(S390FLICState *fs,
  * increase until buffer is sufficient or maxium size is
  * reached
  */
-static void kvm_flic_save(QEMUFile *f, void *opaque, size_t size)
+static void kvm_flic_save(QEMUFile *f, void *opaque, size_t size,
+                          VMStateField *field, QJSON *vmdesc)
 {
     KVMS390FLICState *flic = opaque;
     int len = FLIC_SAVE_INITIAL_SIZE;
@@ -331,7 +332,8 @@ static void kvm_flic_save(QEMUFile *f, void *opaque, size_t size)
  * Note: Do nothing when no interrupts where stored
  * in QEMUFile
  */
-static int kvm_flic_load(QEMUFile *f, void *opaque, size_t size)
+static int kvm_flic_load(QEMUFile *f, void *opaque, size_t size,
+                         VMStateField *field)
 {
     uint64_t len = 0;
     uint64_t count = 0;
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 90f6943..943a960 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -2450,7 +2450,8 @@ static void vmxnet3_put_tx_stats_to_file(QEMUFile *f,
     qemu_put_be64(f, tx_stat->pktsTxDiscard);
 }
 
-static int vmxnet3_get_txq_descr(QEMUFile *f, void *pv, size_t size)
+static int vmxnet3_get_txq_descr(QEMUFile *f, void *pv, size_t size,
+    VMStateField *field)
 {
     Vmxnet3TxqDescr *r = pv;
 
@@ -2464,7 +2465,8 @@ static int vmxnet3_get_txq_descr(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void vmxnet3_put_txq_descr(QEMUFile *f, void *pv, size_t size)
+static void vmxnet3_put_txq_descr(QEMUFile *f, void *pv, size_t size,
+    VMStateField *field, QJSON *vmdesc)
 {
     Vmxnet3TxqDescr *r = pv;
 
@@ -2511,7 +2513,8 @@ static void vmxnet3_put_rx_stats_to_file(QEMUFile *f,
     qemu_put_be64(f, rx_stat->pktsRxError);
 }
 
-static int vmxnet3_get_rxq_descr(QEMUFile *f, void *pv, size_t size)
+static int vmxnet3_get_rxq_descr(QEMUFile *f, void *pv, size_t size,
+    VMStateField *field)
 {
     Vmxnet3RxqDescr *r = pv;
     int i;
@@ -2529,7 +2532,8 @@ static int vmxnet3_get_rxq_descr(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void vmxnet3_put_rxq_descr(QEMUFile *f, void *pv, size_t size)
+static void vmxnet3_put_rxq_descr(QEMUFile *f, void *pv, size_t size,
+    VMStateField *field, QJSON *vmdesc)
 {
     Vmxnet3RxqDescr *r = pv;
     int i;
@@ -2574,7 +2578,8 @@ static const VMStateInfo rxq_descr_info = {
     .put = vmxnet3_put_rxq_descr
 };
 
-static int vmxnet3_get_int_state(QEMUFile *f, void *pv, size_t size)
+static int vmxnet3_get_int_state(QEMUFile *f, void *pv, size_t size,
+    VMStateField *field)
 {
     Vmxnet3IntState *r = pv;
 
@@ -2585,7 +2590,8 @@ static int vmxnet3_get_int_state(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void vmxnet3_put_int_state(QEMUFile *f, void *pv, size_t size)
+static void vmxnet3_put_int_state(QEMUFile *f, void *pv, size_t size,
+    VMStateField *field, QJSON *vmdesc)
 {
     Vmxnet3IntState *r = pv;
 
diff --git a/hw/nvram/eeprom93xx.c b/hw/nvram/eeprom93xx.c
index 2c16fc2..76d5f41 100644
--- a/hw/nvram/eeprom93xx.c
+++ b/hw/nvram/eeprom93xx.c
@@ -94,14 +94,16 @@ struct _eeprom_t {
    This is a Big hack, but it is how the old state did it.
  */
 
-static int get_uint16_from_uint8(QEMUFile *f, void *pv, size_t size)
+static int get_uint16_from_uint8(QEMUFile *f, void *pv, size_t size,
+                                 VMStateField *field)
 {
     uint16_t *v = pv;
     *v = qemu_get_ubyte(f);
     return 0;
 }
 
-static void put_unused(QEMUFile *f, void *pv, size_t size)
+static void put_unused(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                       QJSON *vmdesc)
 {
     fprintf(stderr, "uint16_from_uint8 is used only for backwards compatibility.\n");
     fprintf(stderr, "Never should be used to write a new state.\n");
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 92aa563..a8a4a7a 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -524,14 +524,16 @@ static void fw_cfg_reset(DeviceState *d)
    Or we broke compatibility in the state, or we can't use struct tm
  */
 
-static int get_uint32_as_uint16(QEMUFile *f, void *pv, size_t size)
+static int get_uint32_as_uint16(QEMUFile *f, void *pv, size_t size,
+                                VMStateField *field)
 {
     uint32_t *v = pv;
     *v = qemu_get_be16(f);
     return 0;
 }
 
-static void put_unused(QEMUFile *f, void *pv, size_t size)
+static void put_unused(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                       QJSON *vmdesc)
 {
     fprintf(stderr, "uint32_as_uint16 is only used for backward compatibility.\n");
     fprintf(stderr, "This functions shouldn't be called.\n");
diff --git a/hw/pci/msix.c b/hw/pci/msix.c
index 0ec1cb1..69e7a50 100644
--- a/hw/pci/msix.c
+++ b/hw/pci/msix.c
@@ -587,12 +587,14 @@ void msix_unset_vector_notifiers(PCIDevice *dev)
     dev->msix_vector_poll_notifier = NULL;
 }
 
-static void put_msix_state(QEMUFile *f, void *pv, size_t size)
+static void put_msix_state(QEMUFile *f, void *pv, size_t size,
+                           VMStateField *field, QJSON *vmdesc)
 {
     msix_save(pv, f);
 }
 
-static int get_msix_state(QEMUFile *f, void *pv, size_t size)
+static int get_msix_state(QEMUFile *f, void *pv, size_t size,
+                          VMStateField *field)
 {
     msix_load(pv, f);
     return 0;
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 24fae16..08c4547 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -445,7 +445,8 @@ int pci_bus_numa_node(PCIBus *bus)
     return PCI_BUS_GET_CLASS(bus)->numa_node(bus);
 }
 
-static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
+static int get_pci_config_device(QEMUFile *f, void *pv, size_t size,
+                                 VMStateField *field)
 {
     PCIDevice *s = container_of(pv, PCIDevice, config);
     PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(s);
@@ -484,7 +485,8 @@ static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
 }
 
 /* just put buffer */
-static void put_pci_config_device(QEMUFile *f, void *pv, size_t size)
+static void put_pci_config_device(QEMUFile *f, void *pv, size_t size,
+                                  VMStateField *field, QJSON *vmdesc)
 {
     const uint8_t **v = pv;
     assert(size == pci_config_size(container_of(pv, PCIDevice, config)));
@@ -497,7 +499,8 @@ static VMStateInfo vmstate_info_pci_config = {
     .put  = put_pci_config_device,
 };
 
-static int get_pci_irq_state(QEMUFile *f, void *pv, size_t size)
+static int get_pci_irq_state(QEMUFile *f, void *pv, size_t size,
+                             VMStateField *field)
 {
     PCIDevice *s = container_of(pv, PCIDevice, irq_state);
     uint32_t irq_state[PCI_NUM_PINS];
@@ -518,7 +521,8 @@ static int get_pci_irq_state(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_pci_irq_state(QEMUFile *f, void *pv, size_t size)
+static void put_pci_irq_state(QEMUFile *f, void *pv, size_t size,
+                              VMStateField *field, QJSON *vmdesc)
 {
     int i;
     PCIDevice *s = container_of(pv, PCIDevice, irq_state);
diff --git a/hw/pci/shpc.c b/hw/pci/shpc.c
index 3dcd472..9f82aa6 100644
--- a/hw/pci/shpc.c
+++ b/hw/pci/shpc.c
@@ -695,13 +695,14 @@ void shpc_cap_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
     shpc_cap_update_dword(d);
 }
 
-static void shpc_save(QEMUFile *f, void *pv, size_t size)
+static void shpc_save(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                QJSON *vmdesc)
 {
     PCIDevice *d = container_of(pv, PCIDevice, shpc);
     qemu_put_buffer(f, d->shpc->config, SHPC_SIZEOF(d));
 }
 
-static int shpc_load(QEMUFile *f, void *pv, size_t size)
+static int shpc_load(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     PCIDevice *d = container_of(pv, PCIDevice, shpc);
     int ret = qemu_get_buffer(f, d->shpc->config, SHPC_SIZEOF(d));
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 297216d..f40c10b 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -1945,7 +1945,8 @@ SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
 
 /* SCSI request list.  For simplicity, pv points to the whole device */
 
-static void put_scsi_requests(QEMUFile *f, void *pv, size_t size)
+static void put_scsi_requests(QEMUFile *f, void *pv, size_t size,
+                              VMStateField *field, QJSON *vmdesc)
 {
     SCSIDevice *s = pv;
     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
@@ -1970,7 +1971,8 @@ static void put_scsi_requests(QEMUFile *f, void *pv, size_t size)
     qemu_put_sbyte(f, 0);
 }
 
-static int get_scsi_requests(QEMUFile *f, void *pv, size_t size)
+static int get_scsi_requests(QEMUFile *f, void *pv, size_t size,
+                             VMStateField *field)
 {
     SCSIDevice *s = pv;
     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
diff --git a/hw/timer/twl92230.c b/hw/timer/twl92230.c
index 7ba4e9a..95eb7f3 100644
--- a/hw/timer/twl92230.c
+++ b/hw/timer/twl92230.c
@@ -747,14 +747,16 @@ static int menelaus_rx(I2CSlave *i2c)
    Or we broke compatibility in the state, or we can't use struct tm
  */
 
-static int get_int32_as_uint16(QEMUFile *f, void *pv, size_t size)
+static int get_int32_as_uint16(QEMUFile *f, void *pv, size_t size,
+                               VMStateField *field)
 {
     int *v = pv;
     *v = qemu_get_be16(f);
     return 0;
 }
 
-static void put_int32_as_uint16(QEMUFile *f, void *pv, size_t size)
+static void put_int32_as_uint16(QEMUFile *f, void *pv, size_t size,
+                                VMStateField *field, QJSON *vmdesc)
 {
     int *v = pv;
     qemu_put_be16(f, *v);
diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index d4ca026..7f28c3e 100644
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -2158,7 +2158,8 @@ static int usbredir_post_load(void *priv, int version_id)
 }
 
 /* For usbredirparser migration */
-static void usbredir_put_parser(QEMUFile *f, void *priv, size_t unused)
+static void usbredir_put_parser(QEMUFile *f, void *priv, size_t unused,
+                                VMStateField *field, QJSON *vmdesc)
 {
     USBRedirDevice *dev = priv;
     uint8_t *data;
@@ -2178,7 +2179,8 @@ static void usbredir_put_parser(QEMUFile *f, void *priv, size_t unused)
     free(data);
 }
 
-static int usbredir_get_parser(QEMUFile *f, void *priv, size_t unused)
+static int usbredir_get_parser(QEMUFile *f, void *priv, size_t unused,
+                               VMStateField *field)
 {
     USBRedirDevice *dev = priv;
     uint8_t *data;
@@ -2221,7 +2223,8 @@ static const VMStateInfo usbredir_parser_vmstate_info = {
 
 
 /* For buffered packets (iso/irq) queue migration */
-static void usbredir_put_bufpq(QEMUFile *f, void *priv, size_t unused)
+static void usbredir_put_bufpq(QEMUFile *f, void *priv, size_t unused,
+                               VMStateField *field, QJSON *vmdesc)
 {
     struct endp_data *endp = priv;
     USBRedirDevice *dev = endp->dev;
@@ -2241,7 +2244,8 @@ static void usbredir_put_bufpq(QEMUFile *f, void *priv, size_t unused)
     assert(i == endp->bufpq_size);
 }
 
-static int usbredir_get_bufpq(QEMUFile *f, void *priv, size_t unused)
+static int usbredir_get_bufpq(QEMUFile *f, void *priv, size_t unused,
+                              VMStateField *field)
 {
     struct endp_data *endp = priv;
     USBRedirDevice *dev = endp->dev;
@@ -2344,7 +2348,8 @@ static const VMStateDescription usbredir_ep_vmstate = {
 
 
 /* For PacketIdQueue migration */
-static void usbredir_put_packet_id_q(QEMUFile *f, void *priv, size_t unused)
+static void usbredir_put_packet_id_q(QEMUFile *f, void *priv, size_t unused,
+                                     VMStateField *field, QJSON *vmdesc)
 {
     struct PacketIdQueue *q = priv;
     USBRedirDevice *dev = q->dev;
@@ -2360,7 +2365,8 @@ static void usbredir_put_packet_id_q(QEMUFile *f, void *priv, size_t unused)
     assert(remain == 0);
 }
 
-static int usbredir_get_packet_id_q(QEMUFile *f, void *priv, size_t unused)
+static int usbredir_get_packet_id_q(QEMUFile *f, void *priv, size_t unused,
+                                    VMStateField *field)
 {
     struct PacketIdQueue *q = priv;
     USBRedirDevice *dev = q->dev;
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 06831de..4bd12f0 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -108,7 +108,8 @@ static bool virtio_pci_has_extra_state(DeviceState *d)
     return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA;
 }
 
-static int get_virtio_pci_modern_state(QEMUFile *f, void *pv, size_t size)
+static int get_virtio_pci_modern_state(QEMUFile *f, void *pv, size_t size,
+                                       VMStateField *field)
 {
     VirtIOPCIProxy *proxy = pv;
     int i;
@@ -137,7 +138,8 @@ static void virtio_pci_save_modern_queue_state(VirtIOPCIQueue *vq,
     qemu_put_be32(f, vq->used[1]);
 }
 
-static void put_virtio_pci_modern_state(QEMUFile *f, void *pv, size_t size)
+static void put_virtio_pci_modern_state(QEMUFile *f, void *pv, size_t size,
+                                        VMStateField *field, QJSON *vmdesc)
 {
     VirtIOPCIProxy *proxy = pv;
     int i;
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index d48d1a9..c799c5c 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1490,7 +1490,8 @@ static const VMStateDescription vmstate_virtio_ringsize = {
     }
 };
 
-static int get_extra_state(QEMUFile *f, void *pv, size_t size)
+static int get_extra_state(QEMUFile *f, void *pv, size_t size,
+                           VMStateField *field)
 {
     VirtIODevice *vdev = pv;
     BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
@@ -1503,7 +1504,8 @@ static int get_extra_state(QEMUFile *f, void *pv, size_t size)
     }
 }
 
-static void put_extra_state(QEMUFile *f, void *pv, size_t size)
+static void put_extra_state(QEMUFile *f, void *pv, size_t size,
+                            VMStateField *field, QJSON *vmdesc)
 {
     VirtIODevice *vdev = pv;
     BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
@@ -1640,13 +1642,15 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
 }
 
 /* A wrapper for use as a VMState .put function */
-static void virtio_device_put(QEMUFile *f, void *opaque, size_t size)
+static void virtio_device_put(QEMUFile *f, void *opaque, size_t size,
+                              VMStateField *field, QJSON *vmdesc)
 {
     virtio_save(VIRTIO_DEVICE(opaque), f);
 }
 
 /* A wrapper for use as a VMState .get function */
-static int virtio_device_get(QEMUFile *f, void *opaque, size_t size)
+static int virtio_device_get(QEMUFile *f, void *opaque, size_t size,
+                             VMStateField *field)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
     DeviceClass *dc = DEVICE_CLASS(VIRTIO_DEVICE_GET_CLASS(vdev));
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 1638ee5..d0e37b5 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -81,11 +81,18 @@ void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque);
 
 typedef struct VMStateInfo VMStateInfo;
 typedef struct VMStateDescription VMStateDescription;
+typedef struct VMStateField VMStateField;
 
+/* VMStateInfo allows customized migration of objects that don't fit in
+ * any category in VMStateFlags. Additional information can be passed
+ * into get and put in terms of field and vmdesc parameters.
+ * For primitive data types such as integer, field and vmdesc parameters
+ * should be ignored inside get/put. */
 struct VMStateInfo {
     const char *name;
-    int (*get)(QEMUFile *f, void *pv, size_t size);
-    void (*put)(QEMUFile *f, void *pv, size_t size);
+    int (*get)(QEMUFile *f, void *pv, size_t size, VMStateField *field);
+    void (*put)(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                QJSON *vmdesc);
 };
 
 enum VMStateFlags {
@@ -186,7 +193,7 @@ enum VMStateFlags {
     VMS_MULTIPLY_ELEMENTS = 0x4000,
 };
 
-typedef struct {
+struct VMStateField {
     const char *name;
     size_t offset;
     size_t size;
@@ -199,7 +206,7 @@ typedef struct {
     const VMStateDescription *vmsd;
     int version_id;
     bool (*field_exists)(void *opaque, int version_id);
-} VMStateField;
+};
 
 struct VMStateDescription {
     const char *name;
diff --git a/migration/savevm.c b/migration/savevm.c
index 33a2911..12b7f8d 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -220,14 +220,15 @@ void timer_get(QEMUFile *f, QEMUTimer *ts)
  * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c
  */
 
-static int get_timer(QEMUFile *f, void *pv, size_t size)
+static int get_timer(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     QEMUTimer *v = pv;
     timer_get(f, v);
     return 0;
 }
 
-static void put_timer(QEMUFile *f, void *pv, size_t size)
+static void put_timer(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                QJSON *vmdesc)
 {
     QEMUTimer *v = pv;
     timer_put(f, v);
diff --git a/migration/vmstate.c b/migration/vmstate.c
index fc29acf..d188afa 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -6,6 +6,7 @@
 #include "qemu/bitops.h"
 #include "qemu/error-report.h"
 #include "trace.h"
+#include "migration/qjson.h"
 
 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
                                     void *opaque, QJSON *vmdesc);
@@ -83,6 +84,7 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
 
     trace_vmstate_load_state(vmsd->name, version_id);
     if (version_id > vmsd->version_id) {
+        error_report("%s %s",  vmsd->name, "too new");
         trace_vmstate_load_state_end(vmsd->name, "too new", -EINVAL);
         return -EINVAL;
     }
@@ -93,6 +95,7 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
             trace_vmstate_load_state_end(vmsd->name, "old path", ret);
             return ret;
         }
+        error_report("%s %s",  vmsd->name, "too old");
         trace_vmstate_load_state_end(vmsd->name, "too old", -EINVAL);
         return -EINVAL;
     }
@@ -122,8 +125,10 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
                     ret = vmstate_load_state(f, field->vmsd, addr,
                                              field->vmsd->version_id);
                 } else {
-                    ret = field->info->get(f, addr, size);
-
+                    /* field is always passed in. But it should be ignored by
+                     * get when not needed. It is only needed in cases* of
+                     * customized handling, such as migrating QTAILQ. */
+                    ret = field->info->get(f, addr, size, field);
                 }
                 if (ret >= 0) {
                     ret = qemu_file_get_error(f);
@@ -328,7 +333,11 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
                 if (field->flags & VMS_STRUCT) {
                     vmstate_save_state(f, field->vmsd, addr, vmdesc_loop);
                 } else {
-                    field->info->put(f, addr, size);
+                    /* field and vmdesc_loop are always passed in. But they
+                     * should be ignored by put when not needed. They are
+                     * only needed in cases f customized handling, such as
+                     * migrating QTAILQ. */
+                    field->info->put(f, addr, size, field, vmdesc_loop);
                 }
 
                 written_bytes = qemu_ftell_fast(f) - old_offset;
@@ -461,14 +470,15 @@ static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
 
 /* bool */
 
-static int get_bool(QEMUFile *f, void *pv, size_t size)
+static int get_bool(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     bool *v = pv;
     *v = qemu_get_byte(f);
     return 0;
 }
 
-static void put_bool(QEMUFile *f, void *pv, size_t size)
+static void put_bool(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                     QJSON *vmdesc)
 {
     bool *v = pv;
     qemu_put_byte(f, *v);
@@ -482,14 +492,15 @@ const VMStateInfo vmstate_info_bool = {
 
 /* 8 bit int */
 
-static int get_int8(QEMUFile *f, void *pv, size_t size)
+static int get_int8(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     int8_t *v = pv;
     qemu_get_s8s(f, v);
     return 0;
 }
 
-static void put_int8(QEMUFile *f, void *pv, size_t size)
+static void put_int8(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                     QJSON *vmdesc)
 {
     int8_t *v = pv;
     qemu_put_s8s(f, v);
@@ -503,14 +514,15 @@ const VMStateInfo vmstate_info_int8 = {
 
 /* 16 bit int */
 
-static int get_int16(QEMUFile *f, void *pv, size_t size)
+static int get_int16(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     int16_t *v = pv;
     qemu_get_sbe16s(f, v);
     return 0;
 }
 
-static void put_int16(QEMUFile *f, void *pv, size_t size)
+static void put_int16(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                      QJSON *vmdesc)
 {
     int16_t *v = pv;
     qemu_put_sbe16s(f, v);
@@ -524,14 +536,15 @@ const VMStateInfo vmstate_info_int16 = {
 
 /* 32 bit int */
 
-static int get_int32(QEMUFile *f, void *pv, size_t size)
+static int get_int32(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     int32_t *v = pv;
     qemu_get_sbe32s(f, v);
     return 0;
 }
 
-static void put_int32(QEMUFile *f, void *pv, size_t size)
+static void put_int32(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                      QJSON *vmdesc)
 {
     int32_t *v = pv;
     qemu_put_sbe32s(f, v);
@@ -546,7 +559,8 @@ const VMStateInfo vmstate_info_int32 = {
 /* 32 bit int. See that the received value is the same than the one
    in the field */
 
-static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
+static int get_int32_equal(QEMUFile *f, void *pv, size_t size,
+                           VMStateField *field)
 {
     int32_t *v = pv;
     int32_t v2;
@@ -568,7 +582,7 @@ const VMStateInfo vmstate_info_int32_equal = {
  * and less than or equal to the one in the field.
  */
 
-static int get_int32_le(QEMUFile *f, void *pv, size_t size)
+static int get_int32_le(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     int32_t *cur = pv;
     int32_t loaded;
@@ -589,14 +603,15 @@ const VMStateInfo vmstate_info_int32_le = {
 
 /* 64 bit int */
 
-static int get_int64(QEMUFile *f, void *pv, size_t size)
+static int get_int64(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     int64_t *v = pv;
     qemu_get_sbe64s(f, v);
     return 0;
 }
 
-static void put_int64(QEMUFile *f, void *pv, size_t size)
+static void put_int64(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                      QJSON *vmdesc)
 {
     int64_t *v = pv;
     qemu_put_sbe64s(f, v);
@@ -610,14 +625,15 @@ const VMStateInfo vmstate_info_int64 = {
 
 /* 8 bit unsigned int */
 
-static int get_uint8(QEMUFile *f, void *pv, size_t size)
+static int get_uint8(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     uint8_t *v = pv;
     qemu_get_8s(f, v);
     return 0;
 }
 
-static void put_uint8(QEMUFile *f, void *pv, size_t size)
+static void put_uint8(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                      QJSON *vmdesc)
 {
     uint8_t *v = pv;
     qemu_put_8s(f, v);
@@ -631,14 +647,15 @@ const VMStateInfo vmstate_info_uint8 = {
 
 /* 16 bit unsigned int */
 
-static int get_uint16(QEMUFile *f, void *pv, size_t size)
+static int get_uint16(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     uint16_t *v = pv;
     qemu_get_be16s(f, v);
     return 0;
 }
 
-static void put_uint16(QEMUFile *f, void *pv, size_t size)
+static void put_uint16(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                       QJSON *vmdesc)
 {
     uint16_t *v = pv;
     qemu_put_be16s(f, v);
@@ -652,14 +669,15 @@ const VMStateInfo vmstate_info_uint16 = {
 
 /* 32 bit unsigned int */
 
-static int get_uint32(QEMUFile *f, void *pv, size_t size)
+static int get_uint32(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     uint32_t *v = pv;
     qemu_get_be32s(f, v);
     return 0;
 }
 
-static void put_uint32(QEMUFile *f, void *pv, size_t size)
+static void put_uint32(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                       QJSON *vmdesc)
 {
     uint32_t *v = pv;
     qemu_put_be32s(f, v);
@@ -674,7 +692,8 @@ const VMStateInfo vmstate_info_uint32 = {
 /* 32 bit uint. See that the received value is the same than the one
    in the field */
 
-static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
+static int get_uint32_equal(QEMUFile *f, void *pv, size_t size,
+                            VMStateField *field)
 {
     uint32_t *v = pv;
     uint32_t v2;
@@ -694,14 +713,15 @@ const VMStateInfo vmstate_info_uint32_equal = {
 
 /* 64 bit unsigned int */
 
-static int get_uint64(QEMUFile *f, void *pv, size_t size)
+static int get_uint64(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     uint64_t *v = pv;
     qemu_get_be64s(f, v);
     return 0;
 }
 
-static void put_uint64(QEMUFile *f, void *pv, size_t size)
+static void put_uint64(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                       QJSON *vmdesc)
 {
     uint64_t *v = pv;
     qemu_put_be64s(f, v);
@@ -716,7 +736,8 @@ const VMStateInfo vmstate_info_uint64 = {
 /* 64 bit unsigned int. See that the received value is the same than the one
    in the field */
 
-static int get_uint64_equal(QEMUFile *f, void *pv, size_t size)
+static int get_uint64_equal(QEMUFile *f, void *pv, size_t size,
+                            VMStateField *field)
 {
     uint64_t *v = pv;
     uint64_t v2;
@@ -737,7 +758,8 @@ const VMStateInfo vmstate_info_uint64_equal = {
 /* 8 bit int. See that the received value is the same than the one
    in the field */
 
-static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
+static int get_uint8_equal(QEMUFile *f, void *pv, size_t size,
+                           VMStateField *field)
 {
     uint8_t *v = pv;
     uint8_t v2;
@@ -758,7 +780,8 @@ const VMStateInfo vmstate_info_uint8_equal = {
 /* 16 bit unsigned int int. See that the received value is the same than the one
    in the field */
 
-static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
+static int get_uint16_equal(QEMUFile *f, void *pv, size_t size,
+                            VMStateField *field)
 {
     uint16_t *v = pv;
     uint16_t v2;
@@ -778,7 +801,8 @@ const VMStateInfo vmstate_info_uint16_equal = {
 
 /* floating point */
 
-static int get_float64(QEMUFile *f, void *pv, size_t size)
+static int get_float64(QEMUFile *f, void *pv, size_t size,
+                       VMStateField *field)
 {
     float64 *v = pv;
 
@@ -786,7 +810,8 @@ static int get_float64(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_float64(QEMUFile *f, void *pv, size_t size)
+static void put_float64(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                        QJSON *vmdesc)
 {
     uint64_t *v = pv;
 
@@ -801,7 +826,8 @@ const VMStateInfo vmstate_info_float64 = {
 
 /* CPU_DoubleU type */
 
-static int get_cpudouble(QEMUFile *f, void *pv, size_t size)
+static int get_cpudouble(QEMUFile *f, void *pv, size_t size,
+                         VMStateField *field)
 {
     CPU_DoubleU *v = pv;
     qemu_get_be32s(f, &v->l.upper);
@@ -809,7 +835,8 @@ static int get_cpudouble(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_cpudouble(QEMUFile *f, void *pv, size_t size)
+static void put_cpudouble(QEMUFile *f, void *pv, size_t size,
+                          VMStateField *field, QJSON *vmdesc)
 {
     CPU_DoubleU *v = pv;
     qemu_put_be32s(f, &v->l.upper);
@@ -824,14 +851,16 @@ const VMStateInfo vmstate_info_cpudouble = {
 
 /* uint8_t buffers */
 
-static int get_buffer(QEMUFile *f, void *pv, size_t size)
+static int get_buffer(QEMUFile *f, void *pv, size_t size,
+                      VMStateField *field)
 {
     uint8_t *v = pv;
     qemu_get_buffer(f, v, size);
     return 0;
 }
 
-static void put_buffer(QEMUFile *f, void *pv, size_t size)
+static void put_buffer(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                       QJSON *vmdesc)
 {
     uint8_t *v = pv;
     qemu_put_buffer(f, v, size);
@@ -846,7 +875,8 @@ const VMStateInfo vmstate_info_buffer = {
 /* unused buffers: space that was used for some fields that are
    not useful anymore */
 
-static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
+static int get_unused_buffer(QEMUFile *f, void *pv, size_t size,
+                             VMStateField *field)
 {
     uint8_t buf[1024];
     int block_len;
@@ -859,7 +889,8 @@ static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
    return 0;
 }
 
-static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
+static void put_unused_buffer(QEMUFile *f, void *pv, size_t size,
+                              VMStateField *field, QJSON *vmdesc)
 {
     static const uint8_t buf[1024];
     int block_len;
@@ -884,7 +915,7 @@ const VMStateInfo vmstate_info_unused_buffer = {
  */
 /* This is the number of 64 bit words sent over the wire */
 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
-static int get_bitmap(QEMUFile *f, void *pv, size_t size)
+static int get_bitmap(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     unsigned long *bmp = pv;
     int i, idx = 0;
@@ -898,7 +929,8 @@ static int get_bitmap(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_bitmap(QEMUFile *f, void *pv, size_t size)
+static void put_bitmap(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                QJSON *vmdesc)
 {
     unsigned long *bmp = pv;
     int i, idx = 0;
diff --git a/target-alpha/machine.c b/target-alpha/machine.c
index 710b783..48e3278 100644
--- a/target-alpha/machine.c
+++ b/target-alpha/machine.c
@@ -5,14 +5,15 @@
 #include "hw/boards.h"
 #include "migration/cpu.h"
 
-static int get_fpcr(QEMUFile *f, void *opaque, size_t size)
+static int get_fpcr(QEMUFile *f, void *opaque, size_t size, VMStateField *field)
 {
     CPUAlphaState *env = opaque;
     cpu_alpha_store_fpcr(env, qemu_get_be64(f));
     return 0;
 }
 
-static void put_fpcr(QEMUFile *f, void *opaque, size_t size)
+static void put_fpcr(QEMUFile *f, void *opaque, size_t size,
+                     VMStateField *field, QJSON *vmdesc)
 {
     CPUAlphaState *env = opaque;
     qemu_put_be64(f, cpu_alpha_load_fpcr(env));
diff --git a/target-arm/machine.c b/target-arm/machine.c
index d90943b..96ff2da 100644
--- a/target-arm/machine.c
+++ b/target-arm/machine.c
@@ -17,7 +17,8 @@ static bool vfp_needed(void *opaque)
     return arm_feature(env, ARM_FEATURE_VFP);
 }
 
-static int get_fpscr(QEMUFile *f, void *opaque, size_t size)
+static int get_fpscr(QEMUFile *f, void *opaque, size_t size,
+                     VMStateField *field)
 {
     ARMCPU *cpu = opaque;
     CPUARMState *env = &cpu->env;
@@ -27,7 +28,8 @@ static int get_fpscr(QEMUFile *f, void *opaque, size_t size)
     return 0;
 }
 
-static void put_fpscr(QEMUFile *f, void *opaque, size_t size)
+static void put_fpscr(QEMUFile *f, void *opaque, size_t size,
+                      VMStateField *field, QJSON *vmdesc)
 {
     ARMCPU *cpu = opaque;
     CPUARMState *env = &cpu->env;
@@ -163,7 +165,8 @@ static const VMStateDescription vmstate_pmsav7 = {
     }
 };
 
-static int get_cpsr(QEMUFile *f, void *opaque, size_t size)
+static int get_cpsr(QEMUFile *f, void *opaque, size_t size,
+                    VMStateField *field)
 {
     ARMCPU *cpu = opaque;
     CPUARMState *env = &cpu->env;
@@ -180,7 +183,8 @@ static int get_cpsr(QEMUFile *f, void *opaque, size_t size)
     return 0;
 }
 
-static void put_cpsr(QEMUFile *f, void *opaque, size_t size)
+static void put_cpsr(QEMUFile *f, void *opaque, size_t size,
+                     VMStateField *field, QJSON *vmdesc)
 {
     ARMCPU *cpu = opaque;
     CPUARMState *env = &cpu->env;
diff --git a/target-i386/machine.c b/target-i386/machine.c
index 71c0e4d..1df19e2 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -139,7 +139,8 @@ static const VMStateDescription vmstate_mtrr_var = {
 #define VMSTATE_MTRR_VARS(_field, _state, _n, _v)                    \
     VMSTATE_STRUCT_ARRAY(_field, _state, _n, _v, vmstate_mtrr_var, MTRRVar)
 
-static void put_fpreg_error(QEMUFile *f, void *opaque, size_t size)
+static void put_fpreg_error(QEMUFile *f, void *opaque, size_t size,
+                            VMStateField *field, QJSON *vmdesc)
 {
     fprintf(stderr, "call put_fpreg() with invalid arguments\n");
     exit(0);
@@ -167,7 +168,8 @@ static void fp64_to_fp80(union x86_longdouble *p, uint64_t temp)
     p->exp = e;
 }
 
-static int get_fpreg(QEMUFile *f, void *opaque, size_t size)
+static int get_fpreg(QEMUFile *f, void *opaque, size_t size,
+                     VMStateField *field)
 {
     FPReg *fp_reg = opaque;
     uint64_t mant;
@@ -179,7 +181,8 @@ static int get_fpreg(QEMUFile *f, void *opaque, size_t size)
     return 0;
 }
 
-static void put_fpreg(QEMUFile *f, void *opaque, size_t size)
+static void put_fpreg(QEMUFile *f, void *opaque, size_t size,
+                      VMStateField *field, QJSON *vmdesc)
 {
     FPReg *fp_reg = opaque;
     uint64_t mant;
@@ -197,7 +200,8 @@ static const VMStateInfo vmstate_fpreg = {
     .put  = put_fpreg,
 };
 
-static int get_fpreg_1_mmx(QEMUFile *f, void *opaque, size_t size)
+static int get_fpreg_1_mmx(QEMUFile *f, void *opaque, size_t size,
+                           VMStateField *field)
 {
     union x86_longdouble *p = opaque;
     uint64_t mant;
@@ -214,7 +218,8 @@ static const VMStateInfo vmstate_fpreg_1_mmx = {
     .put  = put_fpreg_error,
 };
 
-static int get_fpreg_1_no_mmx(QEMUFile *f, void *opaque, size_t size)
+static int get_fpreg_1_no_mmx(QEMUFile *f, void *opaque, size_t size,
+                              VMStateField *field)
 {
     union x86_longdouble *p = opaque;
     uint64_t mant;
@@ -276,14 +281,16 @@ static bool less_than_7(void *opaque, int version_id)
     return version_id < 7;
 }
 
-static int get_uint64_as_uint32(QEMUFile *f, void *pv, size_t size)
+static int get_uint64_as_uint32(QEMUFile *f, void *pv, size_t size,
+                                VMStateField *field)
 {
     uint64_t *v = pv;
     *v = qemu_get_be32(f);
     return 0;
 }
 
-static void put_uint64_as_uint32(QEMUFile *f, void *pv, size_t size)
+static void put_uint64_as_uint32(QEMUFile *f, void *pv, size_t size,
+                                 VMStateField *field, QJSON *vmdesc)
 {
     uint64_t *v = pv;
     qemu_put_be32(f, *v);
diff --git a/target-mips/machine.c b/target-mips/machine.c
index a27f2f1..179084c 100644
--- a/target-mips/machine.c
+++ b/target-mips/machine.c
@@ -20,7 +20,7 @@ static int cpu_post_load(void *opaque, int version_id)
 
 /* FPU state */
 
-static int get_fpr(QEMUFile *f, void *pv, size_t size)
+static int get_fpr(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     int i;
     fpr_t *v = pv;
@@ -31,7 +31,8 @@ static int get_fpr(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_fpr(QEMUFile *f, void *pv, size_t size)
+static void put_fpr(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                    QJSON *vmdesc)
 {
     int i;
     fpr_t *v = pv;
@@ -125,7 +126,7 @@ const VMStateDescription vmstate_mvp = {
 
 /* TLB state */
 
-static int get_tlb(QEMUFile *f, void *pv, size_t size)
+static int get_tlb(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     r4k_tlb_t *v = pv;
     uint16_t flags;
@@ -152,7 +153,8 @@ static int get_tlb(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_tlb(QEMUFile *f, void *pv, size_t size)
+static void put_tlb(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                    QJSON *vmdesc)
 {
     r4k_tlb_t *v = pv;
 
diff --git a/target-ppc/machine.c b/target-ppc/machine.c
index 4820f22..0e1822c 100644
--- a/target-ppc/machine.c
+++ b/target-ppc/machine.c
@@ -106,7 +106,7 @@ static int cpu_load_old(QEMUFile *f, void *opaque, int version_id)
     return 0;
 }
 
-static int get_avr(QEMUFile *f, void *pv, size_t size)
+static int get_avr(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     ppc_avr_t *v = pv;
 
@@ -116,7 +116,8 @@ static int get_avr(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_avr(QEMUFile *f, void *pv, size_t size)
+static void put_avr(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                    QJSON *vmdesc)
 {
     ppc_avr_t *v = pv;
 
@@ -324,7 +325,7 @@ static const VMStateDescription vmstate_sr = {
 };
 
 #ifdef TARGET_PPC64
-static int get_slbe(QEMUFile *f, void *pv, size_t size)
+static int get_slbe(QEMUFile *f, void *pv, size_t size, VMStateField *field)
 {
     ppc_slb_t *v = pv;
 
@@ -334,7 +335,8 @@ static int get_slbe(QEMUFile *f, void *pv, size_t size)
     return 0;
 }
 
-static void put_slbe(QEMUFile *f, void *pv, size_t size)
+static void put_slbe(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                     QJSON *vmdesc)
 {
     ppc_slb_t *v = pv;
 
diff --git a/target-sparc/machine.c b/target-sparc/machine.c
index 59c92f7..3194e03 100644
--- a/target-sparc/machine.c
+++ b/target-sparc/machine.c
@@ -59,7 +59,7 @@ static const VMStateDescription vmstate_tlb_entry = {
 };
 #endif
 
-static int get_psr(QEMUFile *f, void *opaque, size_t size)
+static int get_psr(QEMUFile *f, void *opaque, size_t size, VMStateField *field)
 {
     SPARCCPU *cpu = opaque;
     CPUSPARCState *env = &cpu->env;
@@ -72,7 +72,8 @@ static int get_psr(QEMUFile *f, void *opaque, size_t size)
     return 0;
 }
 
-static void put_psr(QEMUFile *f, void *opaque, size_t size)
+static void put_psr(QEMUFile *f, void *opaque, size_t size, VMStateField *field,
+                QJSON *vmdesc)
 {
     SPARCCPU *cpu = opaque;
     CPUSPARCState *env = &cpu->env;
