There are cases when a blob resource's backing might get detached
and re-attached again such as when the underlying object is getting
migrated in the Guest. In these situations, we need to obtain a new
dmabuf fd, which can be done by calling virtio_gpu_init_udmabuf().

Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Alex Bennée <alex.bennee@linaro.org>
Cc: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
---
 hw/display/virtio-gpu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 43e88a4daf..199b18c746 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -937,6 +937,10 @@ virtio_gpu_resource_attach_backing(VirtIOGPU *g,
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         return;
     }
+
+    if (res->blob_size) {
+        virtio_gpu_init_udmabuf(res);
+    }
 }
 
 static void
-- 
2.50.1

On 2025/11/09 14:33, Vivek Kasireddy wrote:
> There are cases when a blob resource's backing might get detached
> and re-attached again such as when the underlying object is getting
> migrated in the Guest. In these situations, we need to obtain a new
> dmabuf fd, which can be done by calling virtio_gpu_init_udmabuf().
> 
> Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
> Cc: Alex Bennée <alex.bennee@linaro.org>
> Cc: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
> Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> Cc: Alex Williamson <alex.williamson@redhat.com>
> Cc: Cédric Le Goater <clg@redhat.com>
> Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>

Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>