[Qemu-devel] [PATCH v5 2/3] qmp: introduce query-memory-size-summary command

[Vadim Galitsyn]

Command above provides the following memory information in bytes:

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

  * hotunpluggable-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 <address@hidden>
Signed-off-by: Mohammed Gamal <address@hidden>
Signed-off-by: Eduardo Otubo <address@hidden>
Signed-off-by: Vadim Galitsyn <address@hidden>
Reviewed-by: Eugene Crosser <address@hidden>
Cc: Dr. David Alan Gilbert <address@hidden>
Cc: Markus Armbruster <address@hidden>
Cc: Igor Mammedov <address@hidden>
Cc: Eric Blake <address@hidden>
Cc: address@hidden
---
 hw/mem/pc-dimm.c                                   |  5 +++++
 include/hw/mem/pc-dimm.h                           |  1 +
 qapi-schema.json                                   | 25 ++++++++++++++++++++++
 qmp.c                                              | 13 +++++++++++
 stubs/Makefile.objs                                |  2 +-
 stubs/{qmp_pc_dimm_device_list.c => qmp_pc_dimm.c} |  5 +++++
 6 files changed, 50 insertions(+), 1 deletion(-)
 rename stubs/{qmp_pc_dimm_device_list.c => qmp_pc_dimm.c} (64%)

diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index ea67b461c2..1df8b7ee57 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -159,6 +159,11 @@ uint64_t pc_existing_dimms_capacity(Error **errp)
     return cap.size;
 }
 
+uint64_t get_existing_hotpluggable_memory_size(void)
+{
+    return pc_existing_dimms_capacity(&error_abort);
+}
+
 int qmp_pc_dimm_device_list(Object *obj, void *opaque)
 {
     MemoryDeviceInfoList ***prev = opaque;
diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
index 1e483f2670..52c6b5e641 100644
--- a/include/hw/mem/pc-dimm.h
+++ b/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_existing_hotpluggable_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,
diff --git a/qapi-schema.json b/qapi-schema.json
index 9c6c3e1a53..bbedf1a7bc 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -4407,6 +4407,31 @@
   '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.
+#
+# @hotunpluggable-memory: size memory that can be hot-unplugged.
+#
+# Since: 2.10.0
+##
+{ 'struct': 'MemoryInfo',
+  'data'  : { 'base-memory': 'size', '*hotunpluggable-memory': 'size' } }
+
+##
+# @query-memory-size-summary:
+#
+# Return the amount of initially allocated and hot-plugged (if
+# enabled) memory in bytes.
+#
+# Since: 2.10.0
+##
+{ 'command': 'query-memory-size-summary', 'returns': 'MemoryInfo' }
+
 ##
 # @query-cpu-definitions:
 #
diff --git a/qmp.c b/qmp.c
index b86201e349..682d950440 100644
--- a/qmp.c
+++ b/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->hotunpluggable_memory = get_existing_hotpluggable_memory_size();
+    mem_info->has_hotunpluggable_memory =
+        (mem_info->hotunpluggable_memory != (uint64_t)-1);
+
+    return mem_info;
+}
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index f5b47bfd74..f7cab5b11c 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -32,7 +32,7 @@ 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
diff --git a/stubs/qmp_pc_dimm_device_list.c b/stubs/qmp_pc_dimm.c
similarity index 64%
rename from stubs/qmp_pc_dimm_device_list.c
rename to stubs/qmp_pc_dimm.c
index def211564d..1d1e008b58 100644
--- a/stubs/qmp_pc_dimm_device_list.c
+++ b/stubs/qmp_pc_dimm.c
@@ -6,3 +6,8 @@ int qmp_pc_dimm_device_list(Object *obj, void *opaque)
 {
    return 0;
 }
+
+uint64_t get_existing_hotpluggable_memory_size(void)
+{
+    return (uint64_t)-1;
+}
-- 
2.13.1.394.g41dd433