Re: [PATCH v3 10/26] coco/tdx-host: Implement FW_UPLOAD sysfs ABI for TDX Module updates

[Huang, Kai]

> 2. TDX Module Updates complete synchronously within .write(), meaning
>    .poll_complete() is only called after successful updates and therefore
>    always returns success

Nit:

Why "updates" instead of "update"?  Is there multiple updates possible
within .write()?

[...]

> 
>  
> +struct tdx_fw_upload_status {
> +	bool cancel_request;
> +};
> +
> +struct fw_upload *tdx_fwl;

Can 'tdx_fwl' be static?

[...]

> 
> +static void seamldr_init(struct device *dev)
> +{
> +	const struct tdx_sys_info *tdx_sysinfo = tdx_get_sysinfo();
> +	int ret;
> +
> +	if (WARN_ON_ONCE(!tdx_sysinfo))
> +		return;
> +
> +	if (!IS_ENABLED(CONFIG_INTEL_TDX_MODULE_UPDATE))
> +		return;
> +
> +	if (!tdx_supports_runtime_update(tdx_sysinfo))
> +		pr_info("Current TDX Module cannot be updated. Consider BIOS updates\n");

What's the point of continuing if runtime update is not supported?

> +
> +	tdx_fwl = firmware_upload_register(THIS_MODULE, dev, "seamldr_upload",
> +					   &tdx_fw_ops, &tdx_fw_upload_status);
> +	ret = PTR_ERR_OR_ZERO(tdx_fwl);
> +	if (ret)
> +		pr_err("failed to register module uploader %d\n", ret);
> +}
> +
> +static void seamldr_deinit(void)
> +{
> +	if (tdx_fwl)
> +		firmware_upload_unregister(tdx_fwl);
> +}
> +
> +static int tdx_host_probe(struct faux_device *fdev)
> +{
> +	seamldr_init(&fdev->dev);

IMHO you need a comment to explain why seamldr_init() doesn't return error
and tdx_host_probe() already returns success?

> +	return 0;
> +}
> +
> +static void tdx_host_remove(struct faux_device *fdev)
> +{
> +	seamldr_deinit();
> +}
> +
> +static struct faux_device_ops tdx_host_ops = {
> +	.probe		= tdx_host_probe,
> +	.remove		= tdx_host_remove,
> +};
> +
>  static struct faux_device *fdev;
>  
>  static int __init tdx_host_init(void)
> @@ -107,7 +229,7 @@ static int __init tdx_host_init(void)
>  	if (!x86_match_cpu(tdx_host_ids) || !tdx_get_sysinfo())
>  		return -ENODEV;
>  
> -	fdev = faux_device_create_with_groups(KBUILD_MODNAME, NULL, NULL, tdx_host_groups);
> +	fdev = faux_device_create_with_groups(KBUILD_MODNAME, NULL, &tdx_host_ops, tdx_host_groups);
>  	if (!fdev)
>  		return -ENODEV;
>