[PULL 4/6] hw/display: fail early when multiple virgl devices are requested

[Gerd Hoffmann <kraxel@redhat.com>]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

This avoids failing to initialize virgl and crashing later on, and clear
the user expectations.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20210705104218.1161101-1-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/virtio-gpu-gl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index 7ab93bf8c829..b1035e119c3b 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -113,6 +113,11 @@ static void virtio_gpu_gl_device_realize(DeviceState *qdev, Error **errp)
     return;
 #endif
 
+    if (!object_resolve_path_type("", TYPE_VIRTIO_GPU_GL, NULL)) {
+        error_setg(errp, "at most one %s device is permitted", TYPE_VIRTIO_GPU_GL);
+        return;
+    }
+
     if (!display_opengl) {
         error_setg(errp, "opengl is not available");
         return;
-- 
2.31.1