linux-kernel - Re: [PATCH v2 0/3] Expose TDX Module version

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Message-ID: <695daa92c40fc_4b7a1002f@dwillia2-mobl4.notmuch>
Date: Tue, 6 Jan 2026 16:36:34 -0800
From: <dan.j.williams@...el.com>
To: Chao Gao <chao.gao@...el.com>, Kiryl Shutsemau <kas@...nel.org>
CC: <kvm@...r.kernel.org>, <linux-coco@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <x86@...nel.org>, <vishal.l.verma@...el.com>,
	<kai.huang@...el.com>, <dan.j.williams@...el.com>,
	<yilun.xu@...ux.intel.com>, <vannapurve@...gle.com>, Borislav Petkov
	<bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin"
	<hpa@...or.com>, Ingo Molnar <mingo@...hat.com>, Rick Edgecombe
	<rick.p.edgecombe@...el.com>, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 0/3] Expose TDX Module version

Chao Gao wrote:
[..]
> And in my opinion, exposing version information to guests is also unnecessary
> since the module version can already be read from the host with this series.
> In debugging scenarios, I'm not sure why the TDX module would be so special
> that guests should know its version but not other host information, such as
> host kernel version, microcode version, etc. None of these are exposed to guest
> kernel (not to mention guest userspace).

Agree, and note that the guest already has full launch attestation
details available via the common
Documentation/ABI/testing/configfs-tsm-report transport.

I assume the primary need for version information is debug, but if you
are debugging a guest problem might as well get the entire launch
attestation with the version of "all the things" included.