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 qemu_loadvm_section_part_end() must report an error
in errp, in case of failure.
This patch also removes the setting of errp when errp is NULL in the
out section as it is no longer required in the series.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Arun Menon <armenon@redhat.com>
---
 migration/savevm.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index b55adb7468e5356ecb636734241f1a356a42a284..8e0ee14cc86dfffee86e46e32c7500d23924dc8e 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2803,21 +2803,20 @@ qemu_loadvm_section_start_full(QEMUFile *f, uint8_t type, Error **errp)
 }
 
 static int
-qemu_loadvm_section_part_end(QEMUFile *f, uint8_t type)
+qemu_loadvm_section_part_end(QEMUFile *f, uint8_t type, Error **errp)
 {
+    ERRP_GUARD();
     bool trace_downtime = (type == QEMU_VM_SECTION_END);
     int64_t start_ts, end_ts;
     uint32_t section_id;
     SaveStateEntry *se;
     int ret;
-    Error *local_err = NULL;
 
     section_id = qemu_get_be32(f);
 
     ret = qemu_file_get_error(f);
     if (ret) {
-        error_report("%s: Failed to read section ID: %d",
-                     __func__, ret);
+        error_setg(errp, "Failed to read section ID: %d", ret);
         return ret;
     }
 
@@ -2828,7 +2827,7 @@ qemu_loadvm_section_part_end(QEMUFile *f, uint8_t type)
         }
     }
     if (se == NULL) {
-        error_report("Unknown savevm section %d", section_id);
+        error_setg(errp, "Unknown section %d", section_id);
         return -EINVAL;
     }
 
@@ -2836,11 +2835,10 @@ qemu_loadvm_section_part_end(QEMUFile *f, uint8_t type)
         start_ts = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
     }
 
-    ret = vmstate_load(f, se, &local_err);
+    ret = vmstate_load(f, se, errp);
     if (ret < 0) {
-        error_report("error while loading state section id %d(%s)",
-                     section_id, se->idstr);
-        warn_report_err(local_err);
+        error_prepend(errp, "error while loading state section id %d(%s): ",
+                      section_id, se->idstr);
         return ret;
     }
 
@@ -2851,6 +2849,8 @@ qemu_loadvm_section_part_end(QEMUFile *f, uint8_t type)
     }
 
     if (!check_section_footer(f, se)) {
+        error_setg(errp, "Section footer error, section_id: %d",
+                   section_id);
         return -EINVAL;
     }
 
@@ -3110,7 +3110,7 @@ retry:
             break;
         case QEMU_VM_SECTION_PART:
         case QEMU_VM_SECTION_END:
-            ret = qemu_loadvm_section_part_end(f, section_type);
+            ret = qemu_loadvm_section_part_end(f, section_type, errp);
             if (ret < 0) {
                 goto out;
             }
@@ -3134,9 +3134,6 @@ retry:
 
 out:
     if (ret < 0) {
-        if (*errp == NULL) {
-            error_setg(errp, "Loading VM state failed: %d", ret);
-        }
         qemu_file_set_error(f, ret);
 
         /* Cancel bitmaps incoming regardless of recovery */

-- 
2.50.1

Arun Menon <armenon@redhat.com> writes:

> 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 qemu_loadvm_section_part_end() must report an error
> in errp, in case of failure.
> This patch also removes the setting of errp when errp is NULL in the
> out section as it is no longer required in the series.
>
> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Signed-off-by: Arun Menon <armenon@redhat.com>

Reviewed-by: Fabiano Rosas <farosas@suse.de>