[PATCH] ui/gtk: flush display pipeline before saving vmstate when blob=true

[Dongwon Kim <dongwon.kim@intel.com>]

If the guest state is paused before it gets a response for the current
scanout frame submission (resource-flush), it won't start submitting
new frames after being restored as it still waits for the old response,
which is accepted as a scanout render done signal. So it's needed to
unblock the current scanout render pipeline before the run state is
changed to make sure the guest receives the response for the current
frame submission.

Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
---
 ui/gtk.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ui/gtk.c b/ui/gtk.c
index 810d7fc796..0f6237dd2f 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -678,6 +678,18 @@ static const DisplayGLCtxOps egl_ctx_ops = {
 static void gd_change_runstate(void *opaque, bool running, RunState state)
 {
     GtkDisplayState *s = opaque;
+    int i;
+
+    if (state == RUN_STATE_SAVE_VM) {
+        for (i = 0; i < s->nb_vcs; i++) {
+            VirtualConsole *vc = &s->vc[i];
+
+            if (vc->gfx.guest_fb.dmabuf) {
+                /* force flushing current scanout blob rendering process */
+                gd_hw_gl_flushed(vc);
+            }
+        }
+    }
 
     gd_update_caption(s);
 }
-- 
2.34.1