[Qemu-devel] [PATCH v8 4/8] migration: Create socket-address parameter

[Juan Quintela <quintela@redhat.com>]

It will be used to store the uri parameters. We want this only for
tcp, so we don't set it for other uris.  We need it to know what port
is migration running.

Signed-off-by: Juan Quintela <quintela@redhat.com>

--

This used to be uri parameter, but it has so many troubles to
reproduce that it don't just make sense.

This used to be a port parameter.  I was asked to move to
SocketAddress, done.
I also merged the setting of the migration tcp port in this one
because now I need to free the address, and this makes it easier.
This used to be x-socket-address with a single direction, now it is a
list of addresses.
---
 hmp.c                 | 14 ++++++++++++++
 migration/migration.c | 25 +++++++++++++++++++++++++
 migration/migration.h |  1 +
 migration/socket.c    | 11 +++++++++++
 qapi/migration.json   | 13 +++++++++++--
 qapi/sockets.json     | 13 +++++++++++++
 6 files changed, 75 insertions(+), 2 deletions(-)

diff --git a/hmp.c b/hmp.c
index a25c7bd9a8..caf94345c9 100644
--- a/hmp.c
+++ b/hmp.c
@@ -355,6 +355,20 @@ 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);
+        if (params->has_socket_address) {
+            SocketAddressList *addr;
+
+            monitor_printf(mon, "%s: [\n",
+                MigrationParameter_str(MIGRATION_PARAMETER_SOCKET_ADDRESS));
+
+            for (addr = params->socket_address; addr; addr = addr->next) {
+                char *s = SocketAddress_to_str("", addr->value,
+                                               false, false);
+                monitor_printf(mon, "\t%s\n", s);
+            }
+
+            monitor_printf(mon, "]\n");
+        }
     }
 
     qapi_free_MigrationParameters(params);
diff --git a/migration/migration.c b/migration/migration.c
index 52a5092add..7eca65d1f0 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -31,6 +31,8 @@
 #include "migration/vmstate.h"
 #include "block/block.h"
 #include "qapi/error.h"
+#include "qapi/clone-visitor.h"
+#include "qapi/qapi-visit-sockets.h"
 #include "qapi/qapi-commands-migration.h"
 #include "qapi/qapi-events-migration.h"
 #include "qapi/qmp/qerror.h"
@@ -277,6 +279,21 @@ int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
     return migrate_send_rp_message(mis, msg_type, msglen, bufc);
 }
 
+void migrate_set_address(SocketAddress *address)
+{
+    MigrationState *s = migrate_get_current();
+    SocketAddressList *addrs;
+
+    addrs = g_new0(SocketAddressList, 1);
+    addrs->next = s->parameters.socket_address;
+    s->parameters.socket_address = addrs;
+
+    if (!s->parameters.has_socket_address) {
+        s->parameters.has_socket_address = true;
+    }
+    addrs->value = QAPI_CLONE(SocketAddress, address);
+}
+
 void qemu_start_incoming_migration(const char *uri, Error **errp)
 {
     const char *p;
@@ -556,6 +573,11 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
     params->x_multifd_page_count = s->parameters.x_multifd_page_count;
     params->has_xbzrle_cache_size = true;
     params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
+    if (s->parameters.socket_address) {
+        params->has_socket_address = true;
+        params->socket_address =
+            QAPI_CLONE(SocketAddressList, s->parameters.socket_address);
+    }
 
     return params;
 }
@@ -2563,6 +2585,9 @@ static void migration_instance_finalize(Object *obj)
     qemu_mutex_destroy(&ms->error_mutex);
     g_free(params->tls_hostname);
     g_free(params->tls_creds);
+    if (params->socket_address) {
+        qapi_free_SocketAddressList(params->socket_address);
+    }
     qemu_sem_destroy(&ms->pause_sem);
     error_free(ms->error);
 }
diff --git a/migration/migration.h b/migration/migration.h
index 8d2f320c48..4774ee305f 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -241,5 +241,6 @@ int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
 
 void dirty_bitmap_mig_before_vm_start(void);
 void init_dirty_bitmap_incoming_migration(void);
+void migrate_set_address(SocketAddress *address);
 
 #endif
diff --git a/migration/socket.c b/migration/socket.c
index 122d8ccfbe..edf33c70cf 100644
--- a/migration/socket.c
+++ b/migration/socket.c
@@ -15,6 +15,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
 
 #include "qemu-common.h"
 #include "qemu/error-report.h"
@@ -152,6 +153,7 @@ static void socket_start_incoming_migration(SocketAddress *saddr,
                                             Error **errp)
 {
     QIONetListener *listener = qio_net_listener_new();
+    int i;
 
     qio_net_listener_set_name(listener, "migration-socket-listener");
 
@@ -163,6 +165,15 @@ static void socket_start_incoming_migration(SocketAddress *saddr,
     qio_net_listener_set_client_func(listener,
                                      socket_accept_incoming_migration,
                                      NULL, NULL);
+
+    for (i = 0; i < listener->nsioc; i++)  {
+        SocketAddress *address =
+            qio_channel_socket_get_local_address(listener->sioc[i], errp);
+        if (address < 0) {
+            return;
+        }
+        migrate_set_address(address);
+    }
 }
 
 void tcp_start_incoming_migration(const char *host_port, Error **errp)
diff --git a/qapi/migration.json b/qapi/migration.json
index 9d0bf82cf4..c3aafaf8fe 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -6,6 +6,7 @@
 ##
 
 { 'include': 'common.json' }
+{ 'include': 'sockets.json' }
 
 ##
 # @MigrationStats:
@@ -494,6 +495,9 @@
 #                     and a power of 2
 #                     (Since 2.11)
 #
+# @socket-address: Only used for tcp, to know what the real port is
+#                  (Since 2.13)
+#
 # Since: 2.4
 ##
 { 'enum': 'MigrationParameter',
@@ -502,7 +506,7 @@
            'tls-creds', 'tls-hostname', 'max-bandwidth',
            'downtime-limit', 'x-checkpoint-delay', 'block-incremental',
            'x-multifd-channels', 'x-multifd-page-count',
-           'xbzrle-cache-size' ] }
+           'xbzrle-cache-size', 'socket-address' ] }
 
 ##
 # @MigrateSetParameters:
@@ -671,6 +675,10 @@
 #                     needs to be a multiple of the target page size
 #                     and a power of 2
 #                     (Since 2.11)
+#
+# @socket-address: Only used for tcp, to know what the real port is
+#                  (Since 2.13)
+#
 # Since: 2.4
 ##
 { 'struct': 'MigrationParameters',
@@ -687,7 +695,8 @@
             '*block-incremental': 'bool' ,
             '*x-multifd-channels': 'uint8',
             '*x-multifd-page-count': 'uint32',
-            '*xbzrle-cache-size': 'size' } }
+            '*xbzrle-cache-size': 'size',
+            '*socket-address': ['SocketAddress'] } }
 
 ##
 # @query-migrate-parameters:
diff --git a/qapi/sockets.json b/qapi/sockets.json
index fc81d8d5e8..f1ca09a927 100644
--- a/qapi/sockets.json
+++ b/qapi/sockets.json
@@ -152,3 +152,16 @@
             'unix': 'UnixSocketAddress',
             'vsock': 'VsockSocketAddress',
             'fd': 'String' } }
+
+##
+# @DummyStruct:
+#
+# Both block-core and migration needs SocketAddressList
+# I am open to comments about how to share it
+#
+# @dummy-list: A dummy list
+#
+# Since: 2.13
+##
+{ 'struct': 'DummyStruct',
+  'data': { 'dummy-list': ['SocketAddress'] } }
-- 
2.17.0