qmp: introduce query-memory-size-summary command

Add a new query-memory-size-summary command which provides the
following memory information in bytes:

  * base-memory - size of "base" memory specified with command line option -m.

  * plugged-memory - amount of memory that was hot-plugged.
    If target does not have CONFIG_MEM_HOTPLUG enabled, no
    value is reported.

Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Signed-off-by: Mohammed Gamal <mohammed.gamal@profitbricks.com>
Signed-off-by: Eduardo Otubo <eduardo.otubo@profitbricks.com>
Signed-off-by: Vadim Galitsyn <vadim.galitsyn@profitbricks.com>
Reviewed-by: Eugene Crosser <evgenii.cherkashin@profitbricks.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Eric Blake <eblake@redhat.com>
Cc: qemu-devel@nongnu.org
Message-Id: <20170829153022.27004-3-vadim.galitsyn@profitbricks.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  Fixup comments as per Igor's review
  Added 'of' from Vadim's reply

hw/mem/pc-dimm.c

@@ -159,6 +159,11 @@ uint64_t pc_existing_dimms_capacity(Error **errp)
     return cap.size;
 }
 
+uint64_t get_plugged_memory_size(void)
+{
+    return pc_existing_dimms_capacity(&error_abort);
+}
+
 int qmp_pc_dimm_device_list(Object *obj, void *opaque)
 {
     MemoryDeviceInfoList ***prev = opaque;

include/hw/mem/pc-dimm.h

@@ -95,6 +95,7 @@ int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
 
 int qmp_pc_dimm_device_list(Object *obj, void *opaque);
 uint64_t pc_existing_dimms_capacity(Error **errp);
+uint64_t get_plugged_memory_size(void);
 void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState *hpms,
                          MemoryRegion *mr, uint64_t align, Error **errp);
 void pc_dimm_memory_unplug(DeviceState *dev, MemoryHotplugState *hpms,

qapi-schema.json

@@ -1965,6 +1965,38 @@
   'data': { 'name': 'str', '*migration-safe': 'bool', 'static': 'bool',
             '*unavailable-features': [ 'str' ], 'typename': 'str' } }
 
+##
+# @MemoryInfo:
+#
+# Actual memory information in bytes.
+#
+# @base-memory: size of "base" memory specified with command line
+#               option -m.
+#
+# @plugged-memory: size of memory that can be hot-unplugged. This field
+#                  is omitted if target doesn't support memory hotplug
+#                  (i.e. CONFIG_MEM_HOTPLUG not defined on build time).
+#
+# Since: 2.11.0
+##
+{ 'struct': 'MemoryInfo',
+  'data'  : { 'base-memory': 'size', '*plugged-memory': 'size' } }
+
+##
+# @query-memory-size-summary:
+#
+# Return the amount of initially allocated and present hotpluggable (if
+# enabled) memory in bytes.
+#
+# Example:
+#
+# -> { "execute": "query-memory-size-summary" }
+# <- { "return": { "base-memory": 4294967296, "plugged-memory": 0 } }
+#
+# Since: 2.11.0
+##
+{ 'command': 'query-memory-size-summary', 'returns': 'MemoryInfo' }
+
 ##
 # @query-cpu-definitions:
 #

qmp.c

@@ -709,3 +709,16 @@ ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
 
     return head;
 }
+
+MemoryInfo *qmp_query_memory_size_summary(Error **errp)
+{
+    MemoryInfo *mem_info = g_malloc0(sizeof(MemoryInfo));
+
+    mem_info->base_memory = ram_size;
+
+    mem_info->plugged_memory = get_plugged_memory_size();
+    mem_info->has_plugged_memory =
+        mem_info->plugged_memory != (uint64_t)-1;
+
+    return mem_info;
+}

stubs/Makefile.objs

@@ -33,7 +33,7 @@ stub-obj-y += uuid.o
 stub-obj-y += vm-stop.o
 stub-obj-y += vmstate.o
 stub-obj-$(CONFIG_WIN32) += fd-register.o
-stub-obj-y += qmp_pc_dimm_device_list.o
+stub-obj-y += qmp_pc_dimm.o
 stub-obj-y += target-monitor-defs.o
 stub-obj-y += target-get-monitor-def.o
 stub-obj-y += pc_madt_cpu_entry.o

stubs/qmp_pc_dimm.c

@@ -6,3 +6,8 @@ int qmp_pc_dimm_device_list(Object *obj, void *opaque)
 {
    return 0;
 }
+
+uint64_t get_plugged_memory_size(void)
+{
+    return (uint64_t)-1;
+}