[Qemu-devel] [PATCH v2] qapi: add query-display-options command

[Gerd Hoffmann <kraxel@redhat.com>]

Add query-display-options command, which allows querying the qemu
display configuration, and -- as an intentional side effect -- makes
DisplayOptions discoverable via query-qmp-schema so libvirt can go
figure which display options are supported.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Tested-by: Eric Blake <eblake@redhat.com>
Tested-by: Erik Skultety <eskultet@redhat.com>
---
 vl.c         | 10 ++++++++++
 qapi/ui.json | 13 +++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/vl.c b/vl.c
index fa25d1ae2d..c6e662677a 100644
--- a/vl.c
+++ b/vl.c
@@ -128,6 +128,7 @@ int main(int argc, char **argv)
 #include "qapi/qapi-commands-block-core.h"
 #include "qapi/qapi-commands-misc.h"
 #include "qapi/qapi-commands-run-state.h"
+#include "qapi/qapi-commands-ui.h"
 #include "qapi/qmp/qerror.h"
 #include "sysemu/iothread.h"
 
@@ -2055,6 +2056,15 @@ static void parse_display_qapi(const char *optarg)
     visit_free(v);
 }
 
+DisplayOptions *qmp_query_display_options(Error **errp)
+{
+    DisplayOptions *opts;
+
+    opts = g_new(DisplayOptions, 1);
+    QAPI_CLONE_MEMBERS(DisplayOptions, opts, &dpy);
+    return opts;
+}
+
 static void parse_display(const char *p)
 {
     const char *opts;
diff --git a/qapi/ui.json b/qapi/ui.json
index e0000248d3..fd39acb5c3 100644
--- a/qapi/ui.json
+++ b/qapi/ui.json
@@ -1102,3 +1102,16 @@
   'discriminator' : 'type',
   'data'    : { 'gtk'            : 'DisplayGTK',
                 'egl-headless'   : 'DisplayEGLHeadless'} }
+
+##
+# @query-display-options:
+#
+# Returns information about display configuration
+#
+# Returns: @DisplayOptions
+#
+# Since: 3.1
+#
+##
+{ 'command': 'query-display-options',
+  'returns': 'DisplayOptions' }
-- 
2.9.3