[PATCH v6 04/10] Remove migrate_set_block_enabled in checkpoint

[leirao]

From: "Rao, Lei" <lei....@intel.com>

We can detect disk migration in migrate_prepare, if disk migration
is enabled in COLO mode, we can directly report an error.and there
is no need to disable block migration at every checkpoint.

Signed-off-by: Lei Rao <lei....@intel.com>
Signed-off-by: Zhang Chen <chen.zh...@intel.com>
Reviewed-by: Li Zhijian <lizhij...@fujitsu.com>
Reviewed-by: Zhang Chen <chen.zh...@intel.com>
Reviewed-by: Lukas Straub <lukasstra...@web.de>
Tested-by: Lukas Straub <lukasstra...@web.de>
---
 migration/colo.c      | 6 ------
 migration/migration.c | 4 ++++
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/migration/colo.c b/migration/colo.c
index de27662..1aaf316 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -435,12 +435,6 @@ static int colo_do_checkpoint_transaction(MigrationState 
*s,
     if (failover_get_state() != FAILOVER_STATUS_NONE) {
         goto out;
     }
-
-    /* Disable block migration */
-    migrate_set_block_enabled(false, &local_err);
-    if (local_err) {
-        goto out;
-    }
     qemu_mutex_lock_iothread();
 
 #ifdef CONFIG_REPLICATION
diff --git a/migration/migration.c b/migration/migration.c
index 8ca0341..c85b926 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2227,6 +2227,10 @@ static bool migrate_prepare(MigrationState *s, bool blk, 
bool blk_inc,
     }
 
     if (blk || blk_inc) {
+        if (migrate_colo_enabled()) {
+            error_setg(errp, "No disk migration is required in COLO mode");
+            return false;
+        }
         if (migrate_use_block() || migrate_use_block_incremental()) {
             error_setg(errp, "Command options are incompatible with "
                        "current migration capabilities");
-- 
1.8.3.1