[PATCH v2 2/2] migration: allow enabling mutilfd for specific protocol only

[Li Zhijian]

And change the default to true so that in '-incoming defer' case, user is able
to change multifd capability.

Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
---
 migration/migration.c | 8 ++++++++
 migration/multifd.c   | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/migration/migration.c b/migration/migration.c
index 212314541f1..b4d0e66cf7b 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1249,6 +1249,14 @@ static bool migrate_caps_check(bool *cap_list,
         }
     }
 
+    /* incoming side only */
+    if (runstate_check(RUN_STATE_INMIGRATE) &&
+        !migrate_multifd_is_allowed() &&
+        cap_list[MIGRATION_CAPABILITY_MULTIFD]) {
+        error_setg(errp, "multifd is not supported by current protocol");
+        return false;
+    }
+
     return true;
 }
 
diff --git a/migration/multifd.c b/migration/multifd.c
index 4a4d16d3888..4643b25c9db 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -864,7 +864,7 @@ cleanup:
     multifd_new_send_channel_cleanup(p, sioc, local_err);
 }
 
-static bool migrate_allow_multifd;
+static bool migrate_allow_multifd = true;
 void migrate_protocol_allow_multifd(bool allow)
 {
     migrate_allow_multifd = allow;
-- 
2.31.1