Re: [PATCH v9 08/23] coco/tdx-host: Expose P-SEAMLDR information via sysfs

[Dave Hansen <dave.hansen@intel.com>]

> +What:		/sys/devices/faux/tdx_host/seamldr_version
> +Contact:	linux-coco@lists.linux.dev
> +Description:	(RO) Report the version of the loaded P-SEAMLDR. The P-SEAMLDR
> +		version is formatted as x.y.z, where "x" is the major version,
> +		"y" is the minor version and "z" is the update version. Versions
> +		are used for bug reporting and compatibility checks.

Rather than a copy/paste, I'd just say the format is the same as the
main module version.

...
> +static ssize_t num_remaining_updates_show(struct device *dev,
> +					  struct device_attribute *attr,
> +					  char *buf)
> +{
> +	struct seamldr_info info;
> +	int ret;
> +
> +	ret = seamldr_get_info(&info);
> +	if (ret)
> +		return ret;
> +
> +	return sysfs_emit(buf, "%u\n", info.num_remaining_updates);
> +}
> +
> +static DEVICE_ATTR_ADMIN_RO(seamldr_version);
> +static DEVICE_ATTR_ADMIN_RO(num_remaining_updates);
> +
> +static struct attribute *seamldr_attrs[] = {
> +	&dev_attr_seamldr_version.attr,
> +	&dev_attr_num_remaining_updates.attr,
> +	NULL,
> +};
> +
> +static umode_t seamldr_group_visible(struct kobject *kobj, struct attribute *attr, int idx)
> +{
> +	const struct tdx_sys_info *sysinfo = tdx_get_sysinfo();
> +
> +	if (!sysinfo)
> +		return 0;
> +
> +	return tdx_supports_runtime_update(sysinfo) ? attr->mode : 0;
> +}
> +
> +static const struct attribute_group seamldr_group = {
> +	.attrs = seamldr_attrs,
> +	.is_visible = seamldr_group_visible,
> +};

I feel like we need to mention *somewhere* that these are kinda nasty.
tdx_get_sysinfo() is slow and single-threaded. These very much are and
need to stay 0400 for good reason.

Talk about the DEVICE_ATTR_ADMIN_RO() choice _somewhere_, please.

With those fixed:

Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>