[PATCH 02/14] migration: Add Error** argument to .load_setup() handler

["Cédric Le Goater" <clg@redhat.com>]

This will be useful to report errors at a higher level, mostly in VFIO
today.

Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 include/migration/register.h |  2 +-
 hw/vfio/migration.c          |  2 +-
 migration/ram.c              |  2 +-
 migration/savevm.c           | 10 ++++++----
 4 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/include/migration/register.h b/include/migration/register.h
index 831600a00eae4efd0464b60925d65de4d9dbcff8..e6bc226c98b27c1fb0f9e2b56d8aff491aa14d65 100644
--- a/include/migration/register.h
+++ b/include/migration/register.h
@@ -72,7 +72,7 @@ typedef struct SaveVMHandlers {
     void (*state_pending_exact)(void *opaque, uint64_t *must_precopy,
                                 uint64_t *can_postcopy);
     LoadStateHandler *load_state;
-    int (*load_setup)(QEMUFile *f, void *opaque);
+    int (*load_setup)(QEMUFile *f, void *opaque, Error **errp);
     int (*load_cleanup)(void *opaque);
     /* Called when postcopy migration wants to resume from failure */
     int (*resume_prepare)(MigrationState *s, void *opaque);
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 8bcb4bc73cd5ba5338e3ffa4d907d0e6bfbb9485..2dfbe671f6f45aa530c7341177bb532d8292cecd 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -580,7 +580,7 @@ static void vfio_save_state(QEMUFile *f, void *opaque)
     }
 }
 
-static int vfio_load_setup(QEMUFile *f, void *opaque)
+static int vfio_load_setup(QEMUFile *f, void *opaque, Error **errp)
 {
     VFIODevice *vbasedev = opaque;
 
diff --git a/migration/ram.c b/migration/ram.c
index 136c237f4079f68d4e578cf1c72eec2efc815bc8..8dac9bac2fe8b8c19e102c771a7ef6e976252906 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3498,7 +3498,7 @@ void colo_release_ram_cache(void)
  * @f: QEMUFile where to receive the data
  * @opaque: RAMState pointer
  */
-static int ram_load_setup(QEMUFile *f, void *opaque)
+static int ram_load_setup(QEMUFile *f, void *opaque, Error **errp)
 {
     xbzrle_load_setup();
     ramblock_recv_map_init();
diff --git a/migration/savevm.c b/migration/savevm.c
index f2ae799bad13e631bccf733a34c3a8fd22e8dd48..990f4249a26d28117ee365d8b20fc5bbca0d43d6 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2737,7 +2737,7 @@ static void qemu_loadvm_state_switchover_ack_needed(MigrationIncomingState *mis)
     trace_loadvm_state_switchover_ack_needed(mis->switchover_ack_pending_num);
 }
 
-static int qemu_loadvm_state_setup(QEMUFile *f)
+static int qemu_loadvm_state_setup(QEMUFile *f, Error **errp)
 {
     SaveStateEntry *se;
     int ret;
@@ -2753,10 +2753,11 @@ static int qemu_loadvm_state_setup(QEMUFile *f)
             }
         }
 
-        ret = se->ops->load_setup(f, se->opaque);
+        ret = se->ops->load_setup(f, se->opaque, errp);
         if (ret < 0) {
+            error_prepend(errp, "Load state of device %s failed: ",
+                          se->idstr);
             qemu_file_set_error(f, ret);
-            error_report("Load state of device %s failed", se->idstr);
             return ret;
         }
     }
@@ -2937,7 +2938,8 @@ int qemu_loadvm_state(QEMUFile *f)
         return ret;
     }
 
-    if (qemu_loadvm_state_setup(f) != 0) {
+    if (qemu_loadvm_state_setup(f, &local_err) != 0) {
+        error_report_err(local_err);
         return -EINVAL;
     }
 
-- 
2.43.0