qapi: Add HV_BALLOON_STATUS_REPORT event and its QMP query command

Used by the hv-balloon driver for (optional) guest memory status reports.

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>

1 files changed, 29 insertions, 1 deletions

diff --git a/hw/hyperv/hv-balloon.c b/hw/hyperv/hv-balloon.c
index 44a8d15cc8..66f297c1d7 100644
--- a/hw/hyperv/hv-balloon.c
+++ b/hw/hyperv/hv-balloon.c
@@ -1102,7 +1102,35 @@ static void hv_balloon_handle_status_report(HvBalloon *balloon,
     balloon->status_report.available *= HV_BALLOON_PAGE_SIZE;
     balloon->status_report.received = true;
 
-    /* report event */
+    qapi_event_send_hv_balloon_status_report(balloon->status_report.committed,
+                                             balloon->status_report.available);
+}
+
+HvBalloonInfo *qmp_query_hv_balloon_status_report(Error **errp)
+{
+    HvBalloon *balloon;
+    HvBalloonInfo *info;
+
+    balloon = HV_BALLOON(object_resolve_path_type("", TYPE_HV_BALLOON, NULL));
+    if (!balloon) {
+        error_setg(errp, "no %s device present", TYPE_HV_BALLOON);
+        return NULL;
+    }
+
+    if (!balloon->status_report.enabled) {
+        error_setg(errp, "guest memory status reporting not enabled");
+        return NULL;
+    }
+
+    if (!balloon->status_report.received) {
+        error_setg(errp, "no guest memory status report received yet");
+        return NULL;
+    }
+
+    info = g_malloc0(sizeof(*info));
+    info->committed = balloon->status_report.committed;
+    info->available = balloon->status_report.available;
+    return info;
 }
 
 static void hv_balloon_handle_unballoon_response(HvBalloon *balloon,