migration: Replace migration's JSON writer by the general one

Commit 8118f09 "migration: Append JSON description of migration stream" needs a JSON writer. The existing qobject_to_json() wasn't a good fit, because it requires building a QObject to convert. Instead, migration got its very own JSON writer, in commit 190c882 "QJSON: Add JSON writer". It tacitly limits numbers to int64_t, and strings contents to characters that don't need escaping, unlike qobject_to_json(). The previous commit factored the JSON writer out of qobject_to_json(). Replace migration's JSON writer by it. Cc: Juan Quintela <quintela@redhat.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20201211171152.146877-17-armbru@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
DrenfongWong · Dec 19, 2020 · 3ddba9a · 3ddba9a
1 parent 998da0b
commit 3ddba9a
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Showing 29 changed files with 114 additions and 253 deletions.
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
@@ -970,7 +970,7 @@ static const VMStateDescription vmstate_virtio_gpu_scanouts = {
 };
 
 static int virtio_gpu_save(QEMUFile *f, void *opaque, size_t size,
-                           const VMStateField *field, QJSON *vmdesc)
+                           const VMStateField *field, JSONWriter *vmdesc)
 {
     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
@@ -386,7 +386,7 @@ static void kvm_s390_release_adapter_routes(S390FLICState *fs,
  * reached
  */
 static int kvm_flic_save(QEMUFile *f, void *opaque, size_t size,
-                         const VMStateField *field, QJSON *vmdesc)
+                         const VMStateField *field, JSONWriter *vmdesc)
 {
     KVMS390FLICState *flic = opaque;
     int len = FLIC_SAVE_INITIAL_SIZE;

diff --git a/hw/nvram/eeprom93xx.c b/hw/nvram/eeprom93xx.c
@@ -104,7 +104,7 @@ static int get_uint16_from_uint8(QEMUFile *f, void *pv, size_t size,
 }
 
 static int put_unused(QEMUFile *f, void *pv, size_t size,
-                      const VMStateField *field, QJSON *vmdesc)
+                      const VMStateField *field, JSONWriter *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
@@ -583,7 +583,7 @@ static int get_uint32_as_uint16(QEMUFile *f, void *pv, size_t size,
 }
 
 static int put_unused(QEMUFile *f, void *pv, size_t size,
-                      const VMStateField *field, QJSON *vmdesc)
+                      const VMStateField *field, JSONWriter *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
@@ -634,7 +634,7 @@ void msix_unset_vector_notifiers(PCIDevice *dev)
 }
 
 static int put_msix_state(QEMUFile *f, void *pv, size_t size,
-                          const VMStateField *field, QJSON *vmdesc)
+                          const VMStateField *field, JSONWriter *vmdesc)
 {
     msix_save(pv, f);
 

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
@@ -559,7 +559,7 @@ static int get_pci_config_device(QEMUFile *f, void *pv, size_t size,
 
 /* just put buffer */
 static int put_pci_config_device(QEMUFile *f, void *pv, size_t size,
-                                 const VMStateField *field, QJSON *vmdesc)
+                                 const VMStateField *field, JSONWriter *vmdesc)
 {
     const uint8_t **v = pv;
     assert(size == pci_config_size(container_of(pv, PCIDevice, config)));
@@ -597,7 +597,7 @@ static int get_pci_irq_state(QEMUFile *f, void *pv, size_t size,
 }
 
 static int put_pci_irq_state(QEMUFile *f, void *pv, size_t size,
-                             const VMStateField *field, QJSON *vmdesc)
+                             const VMStateField *field, JSONWriter *vmdesc)
 {
     int i;
     PCIDevice *s = container_of(pv, PCIDevice, irq_state);

diff --git a/hw/pci/shpc.c b/hw/pci/shpc.c
@@ -699,7 +699,7 @@ void shpc_cap_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
 }
 
 static int shpc_save(QEMUFile *f, void *pv, size_t size,
-                     const VMStateField *field, QJSON *vmdesc)
+                     const VMStateField *field, JSONWriter *vmdesc)
 {
     PCIDevice *d = container_of(pv, PCIDevice, shpc);
     qemu_put_buffer(f, d->shpc->config, SHPC_SIZEOF(d));

diff --git a/hw/rtc/twl92230.c b/hw/rtc/twl92230.c
@@ -762,7 +762,7 @@ static int get_int32_as_uint16(QEMUFile *f, void *pv, size_t size,
 }
 
 static int put_int32_as_uint16(QEMUFile *f, void *pv, size_t size,
-                               const VMStateField *field, QJSON *vmdesc)
+                               const VMStateField *field, JSONWriter *vmdesc)
 {
     int *v = pv;
     qemu_put_be16(f, *v);

diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
@@ -1638,7 +1638,7 @@ static char *scsibus_get_fw_dev_path(DeviceState *dev)
 /* SCSI request list.  For simplicity, pv points to the whole device */
 
 static int put_scsi_requests(QEMUFile *f, void *pv, size_t size,
-                             const VMStateField *field, QJSON *vmdesc)
+                             const VMStateField *field, JSONWriter *vmdesc)
 {
     SCSIDevice *s = pv;
     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);

diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
@@ -2227,7 +2227,7 @@ static int usbredir_post_load(void *priv, int version_id)
 
 /* For usbredirparser migration */
 static int usbredir_put_parser(QEMUFile *f, void *priv, size_t unused,
-                               const VMStateField *field, QJSON *vmdesc)
+                               const VMStateField *field, JSONWriter *vmdesc)
 {
     USBRedirDevice *dev = priv;
     uint8_t *data;
@@ -2294,7 +2294,7 @@ static const VMStateInfo usbredir_parser_vmstate_info = {
 
 /* For buffered packets (iso/irq) queue migration */
 static int usbredir_put_bufpq(QEMUFile *f, void *priv, size_t unused,
-                              const VMStateField *field, QJSON *vmdesc)
+                              const VMStateField *field, JSONWriter *vmdesc)
 {
     struct endp_data *endp = priv;
     USBRedirDevice *dev = endp->dev;
@@ -2421,7 +2421,8 @@ static const VMStateDescription usbredir_ep_vmstate = {
 
 /* For PacketIdQueue migration */
 static int usbredir_put_packet_id_q(QEMUFile *f, void *priv, size_t unused,
-                                    const VMStateField *field, QJSON *vmdesc)
+                                    const VMStateField *field,
+                                    JSONWriter *vmdesc)
 {
     struct PacketIdQueue *q = priv;
     USBRedirDevice *dev = q->dev;

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
@@ -2745,7 +2745,7 @@ static int get_extra_state(QEMUFile *f, void *pv, size_t size,
 }
 
 static int put_extra_state(QEMUFile *f, void *pv, size_t size,
-                           const VMStateField *field, QJSON *vmdesc)
+                           const VMStateField *field, JSONWriter *vmdesc)
 {
     VirtIODevice *vdev = pv;
     BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
@@ -2919,7 +2919,7 @@ int virtio_save(VirtIODevice *vdev, QEMUFile *f)
 
 /* A wrapper for use as a VMState .put function */
 static int virtio_device_put(QEMUFile *f, void *opaque, size_t size,
-                              const VMStateField *field, QJSON *vmdesc)
+                              const VMStateField *field, JSONWriter *vmdesc)
 {
     return virtio_save(VIRTIO_DEVICE(opaque), f);
 }

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
@@ -43,7 +43,7 @@ struct VMStateInfo {
     const char *name;
     int (*get)(QEMUFile *f, void *pv, size_t size, const VMStateField *field);
     int (*put)(QEMUFile *f, void *pv, size_t size, const VMStateField *field,
-               QJSON *vmdesc);
+               JSONWriter *vmdesc);
 };
 
 enum VMStateFlags {
@@ -1169,9 +1169,10 @@ extern const VMStateInfo vmstate_info_qlist;
 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
                        void *opaque, int version_id);
 int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
-                       void *opaque, QJSON *vmdesc);
+                       void *opaque, JSONWriter *vmdesc);
 int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
-                         void *opaque, QJSON *vmdesc, int version_id);
+                         void *opaque, JSONWriter *vmdesc,
+                         int version_id);
 
 bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
 

diff --git a/include/qapi/qmp/json-writer.h b/include/qapi/qmp/json-writer.h
@@ -14,8 +14,6 @@
 #ifndef JSON_WRITER_H
 #define JSON_WRITER_H
 
-typedef struct JSONWriter JSONWriter;
-
 JSONWriter *json_writer_new(bool pretty);
 const char *json_writer_get(JSONWriter *);
 GString *json_writer_get_and_free(JSONWriter *);

diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
@@ -57,8 +57,8 @@ typedef struct IOMMUMemoryRegion IOMMUMemoryRegion;
 typedef struct ISABus ISABus;
 typedef struct ISADevice ISADevice;
 typedef struct IsaDma IsaDma;
+typedef struct JSONWriter JSONWriter;
 typedef struct MACAddr MACAddr;
-typedef struct ReservedRegion ReservedRegion;
 typedef struct MachineClass MachineClass;
 typedef struct MachineState MachineState;
 typedef struct MemoryListener MemoryListener;
@@ -107,14 +107,14 @@ typedef struct QEMUSGList QEMUSGList;
 typedef struct QemuSpin QemuSpin;
 typedef struct QEMUTimer QEMUTimer;
 typedef struct QEMUTimerListGroup QEMUTimerListGroup;
-typedef struct QJSON QJSON;
 typedef struct QList QList;
 typedef struct QNull QNull;
 typedef struct QNum QNum;
 typedef struct QObject QObject;
 typedef struct QString QString;
 typedef struct RAMBlock RAMBlock;
 typedef struct Range Range;
+typedef struct ReservedRegion ReservedRegion;
 typedef struct SavedIOTLB SavedIOTLB;
 typedef struct SHPCDevice SHPCDevice;
 typedef struct SSIBus SSIBus;

diff --git a/migration/meson.build b/migration/meson.build
@@ -6,7 +6,6 @@ migration_files = files(
   'vmstate.c',
   'qemu-file-channel.c',
   'qemu-file.c',
-  'qjson.c',
 )
 softmmu_ss.add(migration_files)
 

diff --git a/migration/qjson.c b/migration/qjson.c
diff --git a/migration/qjson.h b/migration/qjson.h