[PATCH 17/33] migration: push Error **errp into loadvm_process_enable_colo()

["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>
---
 include/migration/colo.h |  2 +-
 migration/migration.c    |  6 +++---
 migration/savevm.c       | 25 +++++++++++--------------
 3 files changed, 15 insertions(+), 18 deletions(-)

diff --git a/include/migration/colo.h b/include/migration/colo.h
index 768e1f04c3..1d38191360 100644
--- a/include/migration/colo.h
+++ b/include/migration/colo.h
@@ -25,7 +25,7 @@ void migrate_start_colo_process(MigrationState *s);
 bool migration_in_colo_state(void);
 
 /* loadvm */
-int migration_incoming_enable_colo(void);
+int migration_incoming_enable_colo(Error **errp);
 void migration_incoming_disable_colo(void);
 bool migration_incoming_colo_enabled(void);
 void *colo_process_incoming_thread(void *opaque);
diff --git a/migration/migration.c b/migration/migration.c
index 287a18d269..b9cf56e61f 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -397,11 +397,11 @@ void migration_incoming_disable_colo(void)
     migration_colo_enabled = false;
 }
 
-int migration_incoming_enable_colo(void)
+int migration_incoming_enable_colo(Error **errp)
 {
     if (ram_block_discard_disable(true)) {
-        error_report("COLO: cannot disable RAM discard");
-        return -EBUSY;
+        error_setg(errp, "COLO: cannot disable RAM discard");
+        return -1;
     }
     migration_colo_enabled = true;
     return 0;
diff --git a/migration/savevm.c b/migration/savevm.c
index b41c812188..c59e76b478 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2212,15 +2212,18 @@ static int loadvm_handle_recv_bitmap(MigrationIncomingState *mis,
     return 0;
 }
 
-static int loadvm_process_enable_colo(MigrationIncomingState *mis)
+static int loadvm_process_enable_colo(MigrationIncomingState *mis,
+                                      Error **errp)
 {
-    int ret = migration_incoming_enable_colo();
+    int ret;
+    if (migration_incoming_enable_colo(errp) < 0) {
+        return -1;
+    }
 
-    if (!ret) {
-        ret = colo_init_ram_cache();
-        if (ret) {
-            migration_incoming_disable_colo();
-        }
+    ret = colo_init_ram_cache();
+    if (ret < 0) {
+        error_setg(errp, "failed to init colo RAM cache: %d", ret);
+        migration_incoming_disable_colo();
     }
     return ret;
 }
@@ -2237,7 +2240,6 @@ static int loadvm_process_command(QEMUFile *f, Error **errp)
     uint16_t cmd;
     uint16_t len;
     uint32_t tmp32;
-    int ret;
 
     cmd = qemu_get_be16(f);
     len = qemu_get_be16(f);
@@ -2310,12 +2312,7 @@ static int loadvm_process_command(QEMUFile *f, Error **errp)
         return loadvm_handle_recv_bitmap(mis, len, errp);
 
     case MIG_CMD_ENABLE_COLO:
-        ret = loadvm_process_enable_colo(mis);
-        if (ret < 0) {
-            error_setg(errp, "Failed to load device state command: %d", ret);
-            return -1;
-        }
-        return ret;
+        return loadvm_process_enable_colo(mis, errp);
     }
 
     return 0;
-- 
2.29.2