drm/qxl: allocate dumb buffers in ram

dumb buffers are shadowed anyway, so there is no need to store them
in device memory.  Use QXL_GEM_DOMAIN_CPU (TTM_PL_SYSTEM) instead.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20210204145712.1531203-11-kraxel@redhat.com

drivers/gpu/drm/qxl/qxl_dumb.c

@@ -59,7 +59,7 @@ int qxl_mode_dumb_create(struct drm_file *file_priv,
 	surf.stride = pitch;
 	surf.format = format;
 	r = qxl_gem_object_create_with_handle(qdev, file_priv,
-					      QXL_GEM_DOMAIN_SURFACE,
+					      QXL_GEM_DOMAIN_CPU,
 					      args->size, &surf, &qobj,
 					      &handle);
 	if (r)