[Qemu-devel] [PATCH 02/22] savevm: Live migration handlers register the struct directly

[Juan Quintela <quintela@redhat.com>]

Notice that the live migration users never unregister, so no problem
about freeing the ops structure.

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 arch_init.c       |    9 +++++++--
 block-migration.c |   10 ++++++++--
 migration.h       |    4 ++--
 savevm.c          |   18 +++++++-----------
 vl.c              |    3 +--
 vmstate.h         |    5 +----
 6 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index 5b0f562..606b848 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -298,7 +298,7 @@ static void migration_end(void)

 #define MAX_WAIT 50 /* ms, half buffered_file limit */

-int ram_save_live(QEMUFile *f, int stage, void *opaque)
+static int ram_save_live(QEMUFile *f, int stage, void *opaque)
 {
     ram_addr_t addr;
     uint64_t bytes_transferred_last;
@@ -437,7 +437,7 @@ static inline void *host_from_stream_offset(QEMUFile *f,
     return NULL;
 }

-int ram_load(QEMUFile *f, void *opaque, int version_id)
+static int ram_load(QEMUFile *f, void *opaque, int version_id)
 {
     ram_addr_t addr;
     int flags, ret = 0;
@@ -534,6 +534,11 @@ done:
     return ret;
 }

+SaveVMHandlers savevm_ram_handlers = {
+    .save_live_state = ram_save_live,
+    .load_state = ram_load,
+};
+
 #ifdef HAS_AUDIO
 struct soundhw {
     const char *name;
diff --git a/block-migration.c b/block-migration.c
index b95b4e1..00151a0 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -709,11 +709,17 @@ static void block_set_params(const MigrationParams *params, void *opaque)
     block_mig_state.blk_enable |= params->shared;
 }

+SaveVMHandlers savevm_block_handlers = {
+    .set_params = block_set_params,
+    .save_live_state = block_save_live,
+    .load_state = block_load,
+};
+
 void blk_mig_init(void)
 {
     QSIMPLEQ_INIT(&block_mig_state.bmds_list);
     QSIMPLEQ_INIT(&block_mig_state.blk_list);

-    register_savevm_live(NULL, "block", 0, 1, block_set_params,
-                         block_save_live, NULL, block_load, &block_mig_state);
+    register_savevm_live(NULL, "block", 0, 1, &savevm_block_handlers,
+                         &block_mig_state);
 }
diff --git a/migration.h b/migration.h
index de13004..57572a6 100644
--- a/migration.h
+++ b/migration.h
@@ -18,6 +18,7 @@
 #include "qemu-common.h"
 #include "notify.h"
 #include "error.h"
+#include "vmstate.h"

 struct MigrationParams {
     bool blk;
@@ -81,8 +82,7 @@ uint64_t ram_bytes_remaining(void);
 uint64_t ram_bytes_transferred(void);
 uint64_t ram_bytes_total(void);

-int ram_save_live(QEMUFile *f, int stage, void *opaque);
-int ram_load(QEMUFile *f, void *opaque, int version_id);
+extern SaveVMHandlers savevm_ram_handlers;

 /**
  * @migrate_add_blocker - prevent migration from proceeding
diff --git a/savevm.c b/savevm.c
index 73626d4..a451be2 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1223,10 +1223,7 @@ int register_savevm_live(DeviceState *dev,
                          const char *idstr,
                          int instance_id,
                          int version_id,
-                         SaveSetParamsHandler *set_params,
-                         SaveLiveStateHandler *save_live_state,
-                         SaveStateHandler *save_state,
-                         LoadStateHandler *load_state,
+                         SaveVMHandlers *ops,
                          void *opaque)
 {
     SaveStateEntry *se;
@@ -1234,16 +1231,12 @@ int register_savevm_live(DeviceState *dev,
     se = g_malloc0(sizeof(SaveStateEntry));
     se->version_id = version_id;
     se->section_id = global_section_id++;
-    se->ops = g_malloc0(sizeof(SaveVMHandlers));
-    se->ops->set_params = set_params;
-    se->ops->save_live_state = save_live_state;
-    se->ops->save_state = save_state;
-    se->ops->load_state = load_state;
+    se->ops = ops;
     se->opaque = opaque;
     se->vmsd = NULL;
     se->no_migrate = 0;
     /* if this is a live_savem then set is_ram */
-    if (save_live_state != NULL) {
+    if (ops->save_live_state != NULL) {
         se->is_ram = 1;
     }

@@ -1282,8 +1275,11 @@ int register_savevm(DeviceState *dev,
                     LoadStateHandler *load_state,
                     void *opaque)
 {
+    SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
+    ops->save_state = save_state;
+    ops->load_state = load_state;
     return register_savevm_live(dev, idstr, instance_id, version_id,
-                                NULL, NULL, save_state, load_state, opaque);
+                                ops, opaque);
 }

 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
diff --git a/vl.c b/vl.c
index 2e140f5..61fe7df 100644
--- a/vl.c
+++ b/vl.c
@@ -3437,8 +3437,7 @@ int main(int argc, char **argv, char **envp)
     default_drive(default_sdcard, snapshot, machine->use_scsi,
                   IF_SD, 0, SD_OPTS);

-    register_savevm_live(NULL, "ram", 0, 4, NULL, ram_save_live, NULL,
-                         ram_load, NULL);
+    register_savevm_live(NULL, "ram", 0, 4, &savevm_ram_handlers, NULL);

     if (nb_numa_nodes > 0) {
         int i;
diff --git a/vmstate.h b/vmstate.h
index 909af69..4bce53b 100644
--- a/vmstate.h
+++ b/vmstate.h
@@ -50,10 +50,7 @@ int register_savevm_live(DeviceState *dev,
                          const char *idstr,
                          int instance_id,
                          int version_id,
-                         SaveSetParamsHandler *set_params,
-                         SaveLiveStateHandler *save_live_state,
-                         SaveStateHandler *save_state,
-                         LoadStateHandler *load_state,
+                         SaveVMHandlers *ops,
                          void *opaque);

 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque);
-- 
1.7.10.4