machine: show if CLI option '-numa node,mem' is supported in QAPI schema

Legacy '-numa node,mem' option has a number of issues and mgmt often
defaults to it. Unfortunately it's no possible to replace it with
an alternative '-numa memdev' without breaking migration compatibility.
What's possible though is to deprecate it, keeping option working with
old machine types only.

In order to help users to find out if being deprecated CLI option
'-numa node,mem' is still supported by particular machine type, add new
"numa-mem-supported" property to output of query-machines.

"numa-mem-supported" is set to 'true' for machines that currently support
NUMA, but it will be flipped to 'false' later on, once deprecation period
expires and kept 'true' only for old machine types that used to support
the legacy option so it won't break existing configuration that are using
it.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1560172207-378962-1-git-send-email-imammedo@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

6 files changed, 11 insertions, 1 deletions

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 20f191bc93..0b5138cb22 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -1952,6 +1952,7 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
     assert(!mc->get_hotplug_handler);
     mc->get_hotplug_handler = virt_machine_get_hotplug_handler;
     hc->plug = virt_machine_device_plug_cb;
+    mc->numa_mem_supported = true;
 }
 
 static void virt_instance_init(Object *obj)
diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
index 14dbad1d6e..754ce77664 100644
--- a/hw/core/machine-qmp-cmds.c
+++ b/hw/core/machine-qmp-cmds.c
@@ -226,6 +226,7 @@ MachineInfoList *qmp_query_machines(Error **errp)
         info->name = g_strdup(mc->name);
         info->cpu_max = !mc->max_cpus ? 1 : mc->max_cpus;
         info->hotpluggable_cpus = mc->has_hotpluggable_cpus;
+        info->numa_mem_supported = mc->numa_mem_supported;
 
         entry = g_malloc0(sizeof(*entry));
         entry->value = info;
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 2107532d12..14f7b4532e 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -2856,6 +2856,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
     nc->nmi_monitor_handler = x86_nmi;
     mc->default_cpu_type = TARGET_DEFAULT_CPU_TYPE;
     mc->nvdimm_supported = true;
+    mc->numa_mem_supported = true;
 
     object_class_property_add(oc, PC_MACHINE_DEVMEM_REGION_SIZE, "int",
         pc_machine_get_device_memory_region_size, NULL,
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 51256ac9ca..821f0d4a49 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4367,6 +4367,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
      * in which LMBs are represented and hot-added
      */
     mc->numa_mem_align_shift = 28;
+    mc->numa_mem_supported = true;
 
     smc->default_caps.caps[SPAPR_CAP_HTM] = SPAPR_CAP_OFF;
     smc->default_caps.caps[SPAPR_CAP_VSX] = SPAPR_CAP_ON;
diff --git a/include/hw/boards.h b/include/hw/boards.h
index d84f48c4af..ae7a542511 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -160,6 +160,8 @@ typedef struct {
  * @kvm_type:
  *    Return the type of KVM corresponding to the kvm-type string option or
  *    computed based on other criteria such as the host kernel capabilities.
+ * @numa_mem_supported:
+ *    true if '--numa node.mem' option is supported and false otherwise
  */
 struct MachineClass {
     /*< private >*/
@@ -212,6 +214,7 @@ struct MachineClass {
     bool ignore_boot_device_suffixes;
     bool smbus_no_migration_support;
     bool nvdimm_supported;
+    bool numa_mem_supported;
 
     HotplugHandler *(*get_hotplug_handler)(MachineState *machine,
                                            DeviceState *dev);
diff --git a/qapi/machine.json b/qapi/machine.json
index 979bc41e49..78d34ef717 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -318,12 +318,15 @@
 #
 # @hotpluggable-cpus: cpu hotplug via -device is supported (since 2.7.0)
 #
+# @numa-mem-supported: true if '-numa node,mem' option is supported by
+#                      the machine type and false otherwise (since 4.1)
+#
 # Since: 1.2.0
 ##
 { 'struct': 'MachineInfo',
   'data': { 'name': 'str', '*alias': 'str',
             '*is-default': 'bool', 'cpu-max': 'int',
-            'hotpluggable-cpus': 'bool'} }
+            'hotpluggable-cpus': 'bool', 'numa-mem-supported': 'bool'} }
 
 ##
 # @query-machines: