Combo Migration/HMP/virtiofs pull

Small fixes all around.
 Ones that are noticeable:
   a) Igor's migration compatibility fix affecting older machine types
      has been seen in the wild
   b) Philippe's autconverge fix should fix an intermittently
      failing migration test.
   c) Mao's makes a small change to the output of 'info
      migrate_parameters'  for tls-authz.
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Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20200325b' into staging

Combo Migration/HMP/virtiofs pull

Small fixes all around.
Ones that are noticeable:
  a) Igor's migration compatibility fix affecting older machine types
     has been seen in the wild
  b) Philippe's autconverge fix should fix an intermittently
     failing migration test.
  c) Mao's makes a small change to the output of 'info
     migrate_parameters'  for tls-authz.

# gpg: Signature made Wed 25 Mar 2020 13:14:48 GMT
# gpg:                using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20200325b:
  migration: use "" instead of (null) for tls-authz
  migration/ram: fix use after free of local_err
  migration/colo: fix use after free of local_err
  vl.c: fix migration failure for 3.1 and older machine types
  tools/virtiofsd/passthrough_ll: Fix double close()
  hmp/vnc: Fix info vnc list leak
  tests/migration: Reduce autoconverge initial bandwidth
  xbzrle: update xbzrle doc
  hmp-cmd: fix a missing_break warning

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/xbzrle.txt

@@ -92,6 +92,11 @@ Usage
 power of 2. The cache default value is 64MBytes. (on source only)
     {qemu} migrate_set_cache_size 256m
 
+Commit 73af8dd8d7 "migration: Make xbzrle_cache_size a migration parameter"
+(v2.11.0) deprecated migrate-set-cache-size, therefore, the new parameter
+is recommended.
+    {qemu} migrate_set_parameter xbzrle-cache-size 256m
+
 4. Start outgoing migration
     {qemu} migrate -d tcp:destination.host:4444
     {qemu} info migrate
@@ -108,7 +113,7 @@ power of 2. The cache default value is 64MBytes. (on source only)
     xbzrle transferred: I kbytes
     xbzrle pages: J pages
     xbzrle cache miss: K
-    xbzrle overflow : L
+    xbzrle overflow: L
 
 xbzrle cache-miss: the number of cache misses to date - high cache-miss rate
 indicates that the cache size is set too low.

migration/colo.c

@@ -93,6 +93,7 @@ static void secondary_vm_do_failover(void)
     replication_stop_all(true, &local_err);
     if (local_err) {
         error_report_err(local_err);
+        local_err = NULL;
     }
 
     /* Notify all filters of all NIC to do checkpoint */

migration/migration.c

@@ -790,7 +790,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
     params->has_tls_hostname = true;
     params->tls_hostname = g_strdup(s->parameters.tls_hostname);
     params->has_tls_authz = true;
-    params->tls_authz = g_strdup(s->parameters.tls_authz);
+    params->tls_authz = g_strdup(s->parameters.tls_authz ?
+                                 s->parameters.tls_authz : "");
     params->has_max_bandwidth = true;
     params->max_bandwidth = s->parameters.max_bandwidth;
     params->has_downtime_limit = true;
@@ -1243,7 +1244,7 @@ static bool migrate_params_check(MigrationParameters *params, Error **errp)
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
                    "xbzrle_cache_size",
                    "is invalid, it should be bigger than target page size"
-                   " and a power of two");
+                   " and a power of 2");
         return false;
     }
 

migration/ram.c

@@ -980,6 +980,7 @@ static void migration_bitmap_sync_precopy(RAMState *rs)
      */
     if (precopy_notify(PRECOPY_NOTIFY_BEFORE_BITMAP_SYNC, &local_err)) {
         error_report_err(local_err);
+        local_err = NULL;
     }
 
     migration_bitmap_sync(rs);

monitor/hmp-cmds.c

@@ -303,7 +303,7 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
                        info->xbzrle_cache->cache_miss);
         monitor_printf(mon, "xbzrle cache miss rate: %0.2f\n",
                        info->xbzrle_cache->cache_miss_rate);
-        monitor_printf(mon, "xbzrle overflow : %" PRIu64 "\n",
+        monitor_printf(mon, "xbzrle overflow: %" PRIu64 "\n",
                        info->xbzrle_cache->overflow);
     }
 
@@ -459,9 +459,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
         monitor_printf(mon, "%s: %" PRIu64 "\n",
             MigrationParameter_str(MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH),
             params->max_postcopy_bandwidth);
-        monitor_printf(mon, " %s: '%s'\n",
+        monitor_printf(mon, "%s: '%s'\n",
             MigrationParameter_str(MIGRATION_PARAMETER_TLS_AUTHZ),
-            params->has_tls_authz ? params->tls_authz : "");
+            params->tls_authz);
     }
 
     qapi_free_MigrationParameters(params);
@@ -527,10 +527,11 @@ static void hmp_info_vnc_servers(Monitor *mon, VncServerInfo2List *server)
 
 void hmp_info_vnc(Monitor *mon, const QDict *qdict)
 {
-    VncInfo2List *info2l;
+    VncInfo2List *info2l, *info2l_head;
     Error *err = NULL;
 
     info2l = qmp_query_vnc_servers(&err);
+    info2l_head = info2l;
     if (err) {
         hmp_handle_error(mon, err);
         return;
@@ -559,7 +560,7 @@ void hmp_info_vnc(Monitor *mon, const QDict *qdict)
         info2l = info2l->next;
     }
 
-    qapi_free_VncInfo2List(info2l);
+    qapi_free_VncInfo2List(info2l_head);
 
 }
 #endif
@@ -1261,6 +1262,7 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
     case MIGRATION_PARAMETER_THROTTLE_TRIGGER_THRESHOLD:
         p->has_throttle_trigger_threshold = true;
         visit_type_int(v, param, &p->throttle_trigger_threshold, &err);
+        break;
     case MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL:
         p->has_cpu_throttle_initial = true;
         visit_type_int(v, param, &p->cpu_throttle_initial, &err);

softmmu/vl.c

@@ -2801,6 +2801,9 @@ static void create_default_memdev(MachineState *ms, const char *path)
     object_property_set_int(obj, ms->ram_size, "size", &error_fatal);
     object_property_add_child(object_get_objects_root(), mc->default_ram_id,
                               obj, &error_fatal);
+    /* Ensure backend's memory region name is equal to mc->default_ram_id */
+    object_property_set_bool(obj, false, "x-use-canonical-path-for-ramblock-id",
+                             &error_fatal);
     user_creatable_complete(USER_CREATABLE(obj), &error_fatal);
     object_unref(obj);
     object_property_set_str(OBJECT(ms), mc->default_ram_id, "memory-backend",

tests/qtest/migration-test.c

@@ -1211,7 +1211,7 @@ static void test_migrate_auto_converge(void)
      * without throttling.
      */
     migrate_set_parameter_int(from, "downtime-limit", 1);
-    migrate_set_parameter_int(from, "max-bandwidth", 100000000); /* ~100Mb/s */
+    migrate_set_parameter_int(from, "max-bandwidth", 1000000); /* ~1Mb/s */
 
     /* To check remaining size after precopy */
     migrate_set_capability(from, "pause-before-switchover", true);

tools/virtiofsd/passthrough_ll.c

@@ -1520,8 +1520,7 @@ out_err:
     if (d) {
         if (d->dp) {
             closedir(d->dp);
-        }
+        } else if (fd != -1) {
-        if (fd != -1) {
             close(fd);
         }
         free(d);