virtio-gpu: update done only on the scanout associated with rect

It only needs to update the scanouts containing the rect area
coming with the resource-flush request from the guest.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
Message-Id: <20220505214030.4261-1-dongwon.kim@intel.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/display/virtio-gpu.c

@@ -514,6 +514,9 @@ static void virtio_gpu_resource_flush(VirtIOGPU *g,
         for (i = 0; i < g->parent_obj.conf.max_outputs; i++) {
             scanout = &g->parent_obj.scanout[i];
             if (scanout->resource_id == res->resource_id &&
+                rf.r.x >= scanout->x && rf.r.y >= scanout->y &&
+                rf.r.x + rf.r.width <= scanout->x + scanout->width &&
+                rf.r.y + rf.r.height <= scanout->y + scanout->height &&
                 console_has_gl(scanout->con)) {
                 dpy_gl_update(scanout->con, 0, 0, scanout->width,
                               scanout->height);