[Qemu-devel] [PATCH v8 08/10] Add migration capabilites

[Orit Wasserman <owasserm@redhat.com>]

Add migration capabiltes that can be queried by the management.
The managment can query to source and the destination in order to
verify both support some maigration capability (currently only XBZRLE).

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
 hmp.c            |   18 ++++++++++++++++++
 hmp.h            |    1 +
 migration.c      |   11 +++++++++++
 monitor.c        |    7 +++++++
 qapi-schema.json |   24 ++++++++++++++++++++++++
 qmp-commands.hx  |   24 ++++++++++++++++++++++++
 savevm.c         |    2 +-
 7 files changed, 86 insertions(+), 1 deletions(-)

diff --git a/hmp.c b/hmp.c
index c2f8c31..186a119 100644
--- a/hmp.c
+++ b/hmp.c
@@ -156,6 +156,24 @@ void hmp_info_migrate(Monitor *mon)
     qapi_free_MigrationInfo(info);
 }
 
+void hmp_info_migration_caps(Monitor *mon)
+{
+    MigrationCapList *caps_list, *cap;
+
+    caps_list = qmp_query_migration_caps(NULL);
+    if (!caps_list) {
+        monitor_printf(mon, "No migration capabilities found\n");
+        return;
+    }
+
+    for (cap = caps_list; cap; cap = cap->next) {
+        monitor_printf(mon, "%s\n", cap->value->name);
+    }
+
+    qapi_free_MigrationCapList(caps_list);
+
+}
+
 void hmp_info_cpus(Monitor *mon)
 {
     CpuInfoList *cpu_list, *cpu;
diff --git a/hmp.h b/hmp.h
index 8807853..1c53d35 100644
--- a/hmp.h
+++ b/hmp.h
@@ -25,6 +25,7 @@ void hmp_info_uuid(Monitor *mon);
 void hmp_info_chardev(Monitor *mon);
 void hmp_info_mice(Monitor *mon);
 void hmp_info_migrate(Monitor *mon);
+void hmp_info_migration_caps(Monitor *mon);
 void hmp_info_cpus(Monitor *mon);
 void hmp_info_block(Monitor *mon);
 void hmp_info_blockstats(Monitor *mon);
diff --git a/migration.c b/migration.c
index 66238de..db8c3d8 100644
--- a/migration.c
+++ b/migration.c
@@ -161,6 +161,17 @@ MigrationInfo *qmp_query_migrate(Error **errp)
     return info;
 }
 
+MigrationCapList *qmp_query_migration_caps(Error **errp)
+{
+    MigrationCapList *caps_list = g_malloc0(sizeof(*caps_list));
+
+    caps_list->value = g_malloc(sizeof(*caps_list->value));
+    caps_list->value->name = g_strdup("uleb");
+    caps_list->next = NULL;
+
+    return caps_list;
+}
+
 /* shared migration helpers */
 
 static int migrate_fd_cleanup(MigrationState *s)
diff --git a/monitor.c b/monitor.c
index 8946a10..ff434e0 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2558,6 +2558,13 @@ static mon_cmd_t info_cmds[] = {
         .mhandler.info = hmp_info_migrate,
     },
     {
+        .name       = "migration_caps",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show migration capabilties",
+        .mhandler.info = hmp_info_migration_caps,
+    },
+    {
         .name       = "balloon",
         .args_type  = "",
         .params     = "",
diff --git a/qapi-schema.json b/qapi-schema.json
index 8b1c78a..e49ec43 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -276,6 +276,30 @@
 { 'command': 'query-migrate', 'returns': 'MigrationInfo' }
 
 ##
+# @MigrationCap
+#
+# Information about current migration capabilites.
+#
+# @xbzrle: true if the current migration supports xbzrle
+#
+# Since: 1.1
+##
+{ 'type': 'MigrationCap',
+  'data': { 'name': 'str'} }
+
+##
+# @query-migration-caps
+#
+# Returns information about current migration process capabilties.
+#
+# Returns: @MigrationCap
+#
+# Since: 1.1
+##
+{ 'command': 'query-migration-caps', 'returns': ['MigrationCap'] }
+
+
+##
 # @MouseInfo:
 #
 # Information about a mouse device.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 5d3714f..c21ec1c 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2073,6 +2073,30 @@ EQMP
     },
 
 SQMP
+query-migration-caps
+-------
+
+Query migration capabilties
+
+- "xbzrle": xbzrle support
+
+Arguments:
+
+Example:
+
+-> { "execute": "query-migration-caps"}
+<- { "return": { "xbzrle" : true } }
+
+EQMP
+
+    {
+        .name       = "query_migration_caps",
+        .args_type  = "",
+	.mhandler.cmd_new = qmp_marshal_input_query_migration_caps,
+    },
+
+
+SQMP
 query-balloon
 -------------
 
diff --git a/savevm.c b/savevm.c
index fbf1903..3c0b7cc 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1573,7 +1573,7 @@ int qemu_savevm_state_begin(QEMUFile *f,
 	}
         se->set_params(params, se->opaque);
     }
-    
+
     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
 
-- 
1.7.7.6