[RFC PATCH 0/2] Virtio-GPU suspend and resume

[Kim, Dongwon]

Hi Dmitry,

> Subject: Re: [RFC PATCH 0/2] Virtio-GPU suspend and resume
> 
> On 5/5/25 22:38, Kim, Dongwon wrote:
> >> I tried to apply your kernel patches and then suspend/resume guest
> >> kernel, it doesn't work:
> >>
> >> virtio_gpu_transfer_to_host_2d: no backing storage 2
> >> [   22.909454] [drm:virtio_gpu_dequeue_ctrl_func] ERROR response
> >> 0x1200 (command 0x105)
> >> virtio_gpu_transfer_to_host_2d: no backing storage 2
> >> [   23.169138] [drm:virtio_gpu_dequeue_ctrl_func] ERROR response
> >> 0x1200 (command 0x105)
> > [Kim, Dongwon] I will check your failing case more closely. As you
> > know, we use virtio-gpu device only for display device, which means I
> > tested this in that specific environment although I thought it is generic
> enough...
> 
> I used virtio-gpu when got these errors.

[Kim, Dongwon] Hmm I thought I would be able to replicate your problem
if I remove blob guest framebuffer but I can't. In the code changes, we are
attaching the backing storage for the resource during recovery process.

+		} else {
+			virtio_gpu_cmd_create_resource(vgdev, curr->bo, &curr->params,
+						       NULL, NULL);
+			virtio_gpu_object_attach(vgdev, curr->bo, ents, nents);
+		}

I do not understand why it says it can't find it. Did you get any error while doing
Virtio_gpu_object_attach? 

What linux distribution do you use for the guest?
Are you using virgl driver or sw rasterizer?  

> 
> --
> Best regards,
> Dmitry
[Kim, Dongwon]  Thanks!