[Qemu-devel] [PATCH v18 6/9] qmp/hmp: add set-vm-generation-id commands

[Igor Mammedov]

Add set-vm-generation-id command to set Virtual Machine
Generation ID counter.

QMP command example:
    { "execute": "set-vm-generation-id",
          "arguments": {
              "guid": "324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"
          }
    }

HMP command example:
    set-vm-generation-id 324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87

Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
v18:
   - use new GuidInfo type introduced in previous patch and fix
     argument to lowercase and corresponding example.
     Eric Blake <ebl...@redhat.com>
   - s/if (errp != NULL)/if (errp)/
     Eric Blake <ebl...@redhat.com>
---
 hmp-commands.hx   | 13 +++++++++++++
 hmp.c             | 12 ++++++++++++
 hmp.h             |  1 +
 hw/misc/vmgenid.c | 11 +++++++++++
 qapi-schema.json  | 11 +++++++++++
 qmp-commands.hx   | 22 ++++++++++++++++++++++
 stubs/vmgenid.c   |  6 ++++++
 7 files changed, 76 insertions(+)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index bb52e4d..d310707 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1756,5 +1756,18 @@ ETEXI
     },
 
 STEXI
+@item set-vm-generation-id @var{uuid}
+Set Virtual Machine Generation ID counter to @var{guid}
+ETEXI
+
+    {
+        .name       = "set-vm-generation-id",
+        .args_type  = "guid:s",
+        .params     = "guid",
+        .help       = "Set Virtual Machine Generation ID counter",
+        .mhandler.cmd = hmp_set_vm_generation_id,
+    },
+
+STEXI
 @end table
 ETEXI
diff --git a/hmp.c b/hmp.c
index aeb753d..c1f3a7a 100644
--- a/hmp.c
+++ b/hmp.c
@@ -2384,3 +2384,15 @@ void hmp_info_vm_generation_id(Monitor *mon, const QDict 
*qdict)
     }
     qapi_free_GuidInfo(info);
 }
+
+void hmp_set_vm_generation_id(Monitor *mon, const QDict *qdict)
+{
+    Error *errp = NULL;
+    const char *guid = qdict_get_str(qdict, "guid");
+
+    qmp_set_vm_generation_id(guid, &errp);
+    if (errp) {
+        hmp_handle_error(mon, &errp);
+        return;
+    }
+}
diff --git a/hmp.h b/hmp.h
index 21c5132..cbf2045 100644
--- a/hmp.h
+++ b/hmp.h
@@ -132,5 +132,6 @@ 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);
+void hmp_set_vm_generation_id(Monitor *mon, const QDict *qdict);
 
 #endif
diff --git a/hw/misc/vmgenid.c b/hw/misc/vmgenid.c
index 24c0a4e..4fa52bc 100644
--- a/hw/misc/vmgenid.c
+++ b/hw/misc/vmgenid.c
@@ -58,6 +58,17 @@ GuidInfo *qmp_query_vm_generation_id(Error **errp)
     return info;
 }
 
+void qmp_set_vm_generation_id(const char *guid, Error **errp)
+{
+    Object *obj = find_vmgneid_dev(errp);
+
+    if (!obj) {
+        return;
+    }
+
+    object_property_set_str(obj, guid, VMGENID_GUID, errp);
+}
+
 static void vmgenid_update_guest(VmGenIdState *s)
 {
     Object *acpi_obj;
diff --git a/qapi-schema.json b/qapi-schema.json
index d4e0463..87a0e25 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -4101,3 +4101,14 @@
 # Since 2.6
 ##
 { 'command': 'query-vm-generation-id', 'returns': 'GuidInfo' }
+
+##
+# @set-vm-generation-id
+#
+# Set Virtual Machine Generation ID
+#
+# @guid: new GUID to set as Virtual Machine Generation ID
+#
+# Since 2.6
+##
+{ 'command': 'set-vm-generation-id', 'data': { 'guid': 'str' } }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 38e4e16..84738c7 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -4814,3 +4814,25 @@ Example:
 
 -> { "execute": "query-vm-generation-id" }
 <- {"return": {"guid": "324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"}}
+
+EQMP
+
+    {
+        .name       = "set-vm-generation-id",
+        .args_type  = "guid:s",
+        .mhandler.cmd_new = qmp_marshal_set_vm_generation_id,
+    },
+
+SQMP
+Set Virtual Machine Generation ID counter
+-----
+
+Arguments:
+
+- "guid": counter ID in GUID string representation (json-string)"
+
+Example:
+
+-> { "execute": "set-vm-generation-id" ,
+     "arguments": { "guid": "324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87" } }
+<- {"return": {}}
diff --git a/stubs/vmgenid.c b/stubs/vmgenid.c
index 1ff8cd2..6af0b73 100644
--- a/stubs/vmgenid.c
+++ b/stubs/vmgenid.c
@@ -5,3 +5,9 @@ GuidInfo *qmp_query_vm_generation_id(Error **errp)
     error_setg(errp, "this command is not currently supported");
     return NULL;
 }
+
+void qmp_set_vm_generation_id(const char *guid, Error **errp)
+{
+    error_setg(errp, "this command is not currently supported");
+    return;
+}
-- 
1.8.3.1