[Qemu-devel] [PATCH v8 26/28] qmp: add query-sev-launch-measure command

[Brijesh Singh <brijesh.singh@amd.com>]

The command can be used by libvirt to retrieve the measurement of SEV guest.
This measurement is a signature of the memory contents that was encrypted
through the LAUNCH_UPDATE_DATA.

Cc: "Daniel P. Berrangé" <berrange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 qapi-schema.json | 29 +++++++++++++++++++++++++++++
 qmp.c            | 17 +++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/qapi-schema.json b/qapi-schema.json
index 9203e28b8aee..5e4836ef9c8b 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3236,3 +3236,32 @@
 #
 ##
 { 'command': 'query-sev', 'returns': 'SevInfo' }
+
+##
+# @SevLaunchMeasureInfo:
+#
+# SEV Guest Launch measurement information
+#
+# @data: the measurement value encoded in base64
+#
+# Since: 2.12
+#
+##
+{ 'struct': 'SevLaunchMeasureInfo', 'data': {'data': 'str'} }
+
+##
+# @query-sev-launch-measure:
+#
+# Query the SEV guest launch information.
+#
+# Returns: The @SevLaunchMeasureInfo for the guest
+#
+# Since: 2.12
+#
+# Example:
+#
+# -> { "execute": "query-sev-launch-measure" }
+# <- { "return": { "data": "4l8LXeNlSPUDlXPJG5966/8%YZ" } }
+#
+##
+{ 'command': 'query-sev-launch-measure', 'returns': 'SevLaunchMeasureInfo' }
diff --git a/qmp.c b/qmp.c
index 7907e539c8f2..0b994f1d9cd7 100644
--- a/qmp.c
+++ b/qmp.c
@@ -735,3 +735,20 @@ SevInfo *qmp_query_sev(Error **errp)
 
     return info;
 }
+
+SevLaunchMeasureInfo *qmp_query_sev_launch_measure(Error **errp)
+{
+    char *data;
+    SevLaunchMeasureInfo *info;
+
+    data = sev_get_launch_measurement();
+    if (!data) {
+        error_setg(errp, "Measurement is not available");
+        return NULL;
+    }
+
+    info = g_malloc0(sizeof(*info));
+    info->data = data;
+
+    return info;
+}
-- 
2.14.3