[Qemu-devel] [PATCH v7 08/11] Add migration capabilties

[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 ++++++++++++++++++++++++
 6 files changed, 85 insertions(+), 0 deletions(-)

diff --git a/hmp.c b/hmp.c
index 4664dbe..9c41e50 100644
--- a/hmp.c
+++ b/hmp.c
@@ -155,6 +155,24 @@ 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 aab0b1f..fdb5b24 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 ce039e3..94f9460 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 void migrate_fd_monitor_suspend(MigrationState *s, Monitor *mon)
diff --git a/monitor.c b/monitor.c
index 187083c..5742765 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2527,6 +2527,13 @@ 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 735eb35..060b7e6 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 799e655..e07d2c2 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1955,6 +1955,30 @@ 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
 -------------
 
-- 
1.7.6.5