[PATCH 10/33] migration: push Error **errp into loadvm_postcopy_handle_advise()

["Daniel P. Berrangé" <berrange@redhat.com>]

This is an incremental step in converting vmstate loading code to report
via Error objects instead of printing directly to the console/monitor.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 migration/savevm.c | 43 +++++++++++++++++++++----------------------
 1 file changed, 21 insertions(+), 22 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index d9170b4364..b0eb250d1c 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1644,38 +1644,41 @@ enum LoadVMExitCodes {
  * quickly.
  */
 static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis,
-                                         uint16_t len)
+                                         uint16_t len,
+                                         Error **errp)
 {
     PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE);
     uint64_t remote_pagesize_summary, local_pagesize_summary, remote_tps;
-    Error *local_err = NULL;
 
     trace_loadvm_postcopy_handle_advise();
     if (ps != POSTCOPY_INCOMING_NONE) {
-        error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps);
+        error_setg(errp,
+                   "CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps);
         return -1;
     }
 
     switch (len) {
     case 0:
         if (migrate_postcopy_ram()) {
-            error_report("RAM postcopy is enabled but have 0 byte advise");
-            return -EINVAL;
+            error_setg(errp, "RAM postcopy is enabled but have 0 byte advise");
+            return -1;
         }
         return 0;
     case 8 + 8:
         if (!migrate_postcopy_ram()) {
-            error_report("RAM postcopy is disabled but have 16 byte advise");
-            return -EINVAL;
+            error_setg(errp,
+                       "RAM postcopy is disabled but have 16 byte advise");
+            return -1;
         }
         break;
     default:
-        error_report("CMD_POSTCOPY_ADVISE invalid length (%d)", len);
-        return -EINVAL;
+        error_setg(errp, "CMD_POSTCOPY_ADVISE invalid length (%d)", len);
+        return -1;
     }
 
     if (!postcopy_ram_supported_by_host(mis)) {
         postcopy_state_set(POSTCOPY_INCOMING_NONE);
+        error_setg(errp, "Postcopy RAM not supported by host");
         return -1;
     }
 
@@ -1697,9 +1700,9 @@ static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis,
          *      also fails when passed to an older qemu that doesn't
          *      do huge pages.
          */
-        error_report("Postcopy needs matching RAM page sizes (s=%" PRIx64
-                                                             " d=%" PRIx64 ")",
-                     remote_pagesize_summary, local_pagesize_summary);
+        error_setg(errp, "Postcopy needs matching RAM page sizes "
+                   "(s=%" PRIx64 " d=%" PRIx64 ")",
+                   remote_pagesize_summary, local_pagesize_summary);
         return -1;
     }
 
@@ -1709,17 +1712,18 @@ static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis,
          * Again, some differences could be dealt with, but for now keep it
          * simple.
          */
-        error_report("Postcopy needs matching target page sizes (s=%d d=%zd)",
-                     (int)remote_tps, qemu_target_page_size());
+        error_setg(errp,
+                   "Postcopy needs matching target page sizes (s=%d d=%zd)",
+                   (int)remote_tps, qemu_target_page_size());
         return -1;
     }
 
-    if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_ADVISE, &local_err)) {
-        error_report_err(local_err);
+    if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_ADVISE, errp)) {
         return -1;
     }
 
     if (ram_postcopy_incoming_init(mis)) {
+        error_setg(errp, "Postcopy RAM incoming init failed");
         return -1;
     }
 
@@ -2282,12 +2286,7 @@ static int loadvm_process_command(QEMUFile *f, Error **errp)
         return loadvm_handle_cmd_packaged(mis, errp);
 
     case MIG_CMD_POSTCOPY_ADVISE:
-        ret = loadvm_postcopy_handle_advise(mis, len);
-        if (ret < 0) {
-            error_setg(errp, "Failed to load device state command: %d", ret);
-            return -1;
-        }
-        return ret;
+        return loadvm_postcopy_handle_advise(mis, len, errp);
 
     case MIG_CMD_POSTCOPY_LISTEN:
         ret = loadvm_postcopy_handle_listen(mis);
-- 
2.29.2