[Qemu-devel] [PATCH v19 5/9] qmp/hmp: add query-vm-generation-id and 'info vm-generation-id' commands

[Igor Mammedov <imammedo@redhat.com>]

Add commands to query Virtual Machine Generation ID counter.

QMP command example:
    { "execute": "query-vm-generation-id" }

HMP command example:
    info vm-generation-id

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v18:
  - add a new QMP type GuidInfo instead of reusing UuidInfo
    Eric Blake <eblake@redhat.com>
---
 hmp-commands-info.hx | 13 +++++++++++++
 hmp.c                |  9 +++++++++
 hmp.h                |  1 +
 hw/misc/vmgenid.c    | 20 ++++++++++++++++++++
 qapi-schema.json     | 20 ++++++++++++++++++++
 qmp-commands.hx      | 19 +++++++++++++++++++
 stubs/Makefile.objs  |  1 +
 stubs/vmgenid.c      |  7 +++++++
 8 files changed, 90 insertions(+)
 create mode 100644 stubs/vmgenid.c

diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index 9b71351..b649a5d 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -787,6 +787,19 @@ Display the value of a storage key (s390 only)
 ETEXI
 
 STEXI
+@item info vm-generation-id
+Show Virtual Machine Generation ID
+ETEXI
+
+    {
+        .name       = "vm-generation-id",
+        .args_type  = "",
+        .params     = "",
+        .help       = "Show Virtual Machine Generation ID",
+        .mhandler.cmd = hmp_info_vm_generation_id,
+    },
+
+STEXI
 @end table
 ETEXI
 
diff --git a/hmp.c b/hmp.c
index 54f2620..aeb753d 100644
--- a/hmp.c
+++ b/hmp.c
@@ -2375,3 +2375,12 @@ void hmp_rocker_of_dpa_groups(Monitor *mon, const QDict *qdict)
 
     qapi_free_RockerOfDpaGroupList(list);
 }
+
+void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict)
+{
+    GuidInfo *info = qmp_query_vm_generation_id(NULL);
+    if (info) {
+        monitor_printf(mon, "%s\n", info->guid);
+    }
+    qapi_free_GuidInfo(info);
+}
diff --git a/hmp.h b/hmp.h
index a8c5b5a..21c5132 100644
--- a/hmp.h
+++ b/hmp.h
@@ -131,5 +131,6 @@ void hmp_rocker(Monitor *mon, const QDict *qdict);
 void hmp_rocker_ports(Monitor *mon, const QDict *qdict);
 void hmp_rocker_of_dpa_flows(Monitor *mon, const QDict *qdict);
 void hmp_rocker_of_dpa_groups(Monitor *mon, const QDict *qdict);
+void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict);
 
 #endif
diff --git a/hw/misc/vmgenid.c b/hw/misc/vmgenid.c
index a2fbdfc..24c0a4e 100644
--- a/hw/misc/vmgenid.c
+++ b/hw/misc/vmgenid.c
@@ -16,6 +16,7 @@
 #include "hw/misc/vmgenid.h"
 #include "hw/acpi/acpi.h"
 #include "qapi/visitor.h"
+#include "qmp-commands.h"
 
 #define VMGENID(obj) OBJECT_CHECK(VmGenIdState, (obj), VMGENID_DEVICE)
 
@@ -38,6 +39,25 @@ Object *find_vmgneid_dev(Error **errp)
     return obj;
 }
 
+GuidInfo *qmp_query_vm_generation_id(Error **errp)
+{
+    GuidInfo *info;
+    VmGenIdState *vdev;
+    Object *obj = find_vmgneid_dev(errp);
+
+    if (!obj) {
+        return NULL;
+    }
+    vdev = VMGENID(obj);
+    info = g_malloc0(sizeof(*info));
+    info->guid = g_strdup_printf(UUID_FMT, vdev->guid[0], vdev->guid[1],
+        vdev->guid[2], vdev->guid[3], vdev->guid[4], vdev->guid[5],
+        vdev->guid[6], vdev->guid[7], vdev->guid[8], vdev->guid[9],
+        vdev->guid[10], vdev->guid[11], vdev->guid[12], vdev->guid[13],
+        vdev->guid[14], vdev->guid[15]);
+    return info;
+}
+
 static void vmgenid_update_guest(VmGenIdState *s)
 {
     Object *acpi_obj;
diff --git a/qapi-schema.json b/qapi-schema.json
index 8d04897..3f99549 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -4083,3 +4083,23 @@
 ##
 { 'enum': 'ReplayMode',
   'data': [ 'none', 'record', 'play' ] }
+
+##
+# @GuidInfo:
+#
+# GUID information.
+#
+# @guid: the globally unique identifier
+#
+# Since: 2.6
+##
+{ 'struct': 'GuidInfo', 'data': {'guid': 'str'} }
+
+##
+# @query-vm-generation-id
+#
+# Show Virtual Machine Generation ID
+#
+# Since 2.6
+##
+{ 'command': 'query-vm-generation-id', 'returns': 'GuidInfo' }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index db072a6..38e4e16 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -4795,3 +4795,22 @@ Example:
                  {"type": 0, "out-pport": 0, "pport": 0, "vlan-id": 3840,
                   "pop-vlan": 1, "id": 251658240}
    ]}
+
+EQMP
+
+    {
+        .name       = "query-vm-generation-id",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_query_vm_generation_id,
+    },
+
+SQMP
+Show Virtual Machine Generation ID counter
+-----
+
+Arguments: none
+
+Example:
+
+-> { "execute": "query-vm-generation-id" }
+<- {"return": {"guid": "324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"}}
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index d7898a0..c1ebfcc 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -38,3 +38,4 @@ stub-obj-y += qmp_pc_dimm_device_list.o
 stub-obj-y += target-monitor-defs.o
 stub-obj-y += target-get-monitor-def.o
 stub-obj-y += vhost.o
+stub-obj-y += vmgenid.o
diff --git a/stubs/vmgenid.c b/stubs/vmgenid.c
new file mode 100644
index 0000000..1ff8cd2
--- /dev/null
+++ b/stubs/vmgenid.c
@@ -0,0 +1,7 @@
+#include "qmp-commands.h"
+
+GuidInfo *qmp_query_vm_generation_id(Error **errp)
+{
+    error_setg(errp, "this command is not currently supported");
+    return NULL;
+}
-- 
1.8.3.1