linux-kernel - Re: [PATCH 2/2] coco/tdx-host: Expose TDX module version

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Message-ID: <e4041d4706fe55d3d012144680d9be33acdda19f.camel@intel.com>
Date: Wed, 1 Oct 2025 04:12:10 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Gao, Chao"
	<chao.gao@...el.com>, "x86@...nel.org" <x86@...nel.org>
CC: "Williams, Dan J" <dan.j.williams@...el.com>, "kas@...nel.org"
	<kas@...nel.org>, "yilun.xu@...ux.intel.com" <yilun.xu@...ux.intel.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH 2/2] coco/tdx-host: Expose TDX module version

On Tue, 2025-09-30 at 19:22 -0700, Chao Gao wrote:
> Currently these is no way to know the TDX module version from the
	    ^
	    there is

> userspace. such information is helpful for bug reporting or
	     ^
	     Such

> debugging.
> 
> 

[...]

> +static ssize_t version_show(struct device *dev, struct device_attribute *attr,
> +			    char *buf)
> +{
> +	const struct tdx_sys_info *tdx_sysinfo = tdx_get_sysinfo();
> +	const struct tdx_sys_info_version *ver;
> +
> +	if (!tdx_sysinfo)
> +		return -ENXIO;
> +
> +	ver = &tdx_sysinfo->version;
> +
> +	return sysfs_emit(buf, "%u.%u.%02u\n", ver->major_version,
> +					       ver->minor_version,
> +					       ver->update_version);

Nit: not sure whether the "%u.%u.%02u" needs a comment, e.g., why the %02u
is used for the update_version?