[PATCH v5 5/6] migration: Add migrate_use_tls() helper

[Leonardo Bras <leobras@redhat.com>]

A lot of places check parameters.tls_creds in order to evaluate if TLS is
in use, and sometimes call migrate_get_current() just for that test.

Add new helper function migrate_use_tls() in order to simplify testing
for TLS usage.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
---
 migration/migration.h | 1 +
 migration/channel.c   | 6 +++---
 migration/migration.c | 9 +++++++++
 migration/multifd.c   | 5 +----
 4 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/migration/migration.h b/migration/migration.h
index e61ef81f26..9f38419312 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -344,6 +344,7 @@ int migrate_use_zerocopy(void);
 #else
 #define migrate_use_zerocopy() (0)
 #endif
+int migrate_use_tls(void);
 int migrate_use_xbzrle(void);
 uint64_t migrate_xbzrle_cache_size(void);
 bool migrate_colo_enabled(void);
diff --git a/migration/channel.c b/migration/channel.c
index c4fc000a1a..1a45b75d29 100644
--- a/migration/channel.c
+++ b/migration/channel.c
@@ -32,16 +32,16 @@
  */
 void migration_channel_process_incoming(QIOChannel *ioc)
 {
-    MigrationState *s = migrate_get_current();
     Error *local_err = NULL;
 
     trace_migration_set_incoming_channel(
         ioc, object_get_typename(OBJECT(ioc)));
 
-    if (s->parameters.tls_creds &&
-        *s->parameters.tls_creds &&
+    if (migrate_use_tls() &&
         !object_dynamic_cast(OBJECT(ioc),
                              TYPE_QIO_CHANNEL_TLS)) {
+        MigrationState *s = migrate_get_current();
+
         migration_tls_channel_process_incoming(s, ioc, &local_err);
     } else {
         migration_ioc_register_yank(ioc);
diff --git a/migration/migration.c b/migration/migration.c
index add3dabc56..20ca99d726 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2565,6 +2565,15 @@ int migrate_use_zerocopy(void)
 }
 #endif
 
+int migrate_use_tls(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->parameters.tls_creds && *s->parameters.tls_creds;
+}
+
 int migrate_use_xbzrle(void)
 {
     MigrationState *s;
diff --git a/migration/multifd.c b/migration/multifd.c
index ab8f0f97be..3d9dc8cb58 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -794,14 +794,11 @@ static bool multifd_channel_connect(MultiFDSendParams *p,
                                     QIOChannel *ioc,
                                     Error *error)
 {
-    MigrationState *s = migrate_get_current();
-
     trace_multifd_set_outgoing_channel(
         ioc, object_get_typename(OBJECT(ioc)), p->tls_hostname, error);
 
     if (!error) {
-        if (s->parameters.tls_creds &&
-            *s->parameters.tls_creds &&
+        if (migrate_use_tls() &&
             !object_dynamic_cast(OBJECT(ioc),
                                  TYPE_QIO_CHANNEL_TLS)) {
             multifd_tls_channel_connect(p, ioc, &error);
-- 
2.33.1