migration/postcopy: Add max-postcopy-bandwidth parameter

Limit the background transfer bandwidth during the postcopy
phase to the value set on this new parameter.  The default, 0,
corresponds to the existing behaviour which is unlimited bandwidth.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20180613102642.23995-2-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/hmp.c b/hmp.c
index ef93f4878b..f40d8279cf 100644
--- a/hmp.c
+++ b/hmp.c
@@ -370,6 +370,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
         monitor_printf(mon, "%s: %" PRIu64 "\n",
             MigrationParameter_str(MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE),
             params->xbzrle_cache_size);
+        monitor_printf(mon, "%s: %" PRIu64 "\n",
+            MigrationParameter_str(MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH),
+            params->max_postcopy_bandwidth);
     }
 
     qapi_free_MigrationParameters(params);
@@ -1676,6 +1679,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
         }
         p->xbzrle_cache_size = cache_size;
         break;
+    case MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH:
+        p->has_max_postcopy_bandwidth = true;
+        visit_type_size(v, param, &p->max_postcopy_bandwidth, &err);
+        break;
     default:
         assert(0);
     }