[PATCH v9 04/27] migration: push Error **errp into vmstate_load()

[Arun Menon <armenon@redhat.com>]

This is an incremental step in converting vmstate loading
code to report error via Error objects instead of directly
printing it to console/monitor.
It is ensured that vmstate_load() must report an error
in errp, in case of failure.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Arun Menon <armenon@redhat.com>
---
 migration/savevm.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index b517e3bec651cb5b4050564f7dcbbf34c80a5035..f37c4455dcf839d46f026fc7c7ff02e2dfffe7b4 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -963,14 +963,20 @@ void vmstate_unregister(VMStateIf *obj, const VMStateDescription *vmsd,
     }
 }
 
-static int vmstate_load(QEMUFile *f, SaveStateEntry *se)
+static int vmstate_load(QEMUFile *f, SaveStateEntry *se, Error **errp)
 {
+    int ret;
     trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
     if (!se->vmsd) {         /* Old style */
-        return se->ops->load_state(f, se->opaque, se->load_version_id);
+        ret = se->ops->load_state(f, se->opaque, se->load_version_id);
+        if (ret < 0) {
+            error_setg(errp, "Failed to load VM version_id: %d, ret: %d",
+                       se->load_version_id, ret);
+        }
+        return ret;
     }
     return vmstate_load_state(f, se->vmsd, se->opaque, se->load_version_id,
-                              NULL);
+                              errp);
 }
 
 static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se,
@@ -2741,7 +2747,7 @@ qemu_loadvm_section_start_full(QEMUFile *f, uint8_t type)
         start_ts = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
     }
 
-    ret = vmstate_load(f, se);
+    ret = vmstate_load(f, se, NULL);
     if (ret < 0) {
         error_report("error while loading state for instance 0x%"PRIx32" of"
                      " device '%s'", instance_id, idstr);
@@ -2794,7 +2800,7 @@ qemu_loadvm_section_part_end(QEMUFile *f, uint8_t type)
         start_ts = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
     }
 
-    ret = vmstate_load(f, se);
+    ret = vmstate_load(f, se, NULL);
     if (ret < 0) {
         error_report("error while loading state section id %d(%s)",
                      section_id, se->idstr);

-- 
2.50.1