linux-kernel - Re: [PATCH v2 0/2] x86/virt/tdx: Print TDX module version to dmesg

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Message-ID: <6d8d37740459963e6fd7f16a890a837b34ebdf17.camel@intel.com>
Date: Thu, 5 Feb 2026 19:05:39 +0000
From: "Verma, Vishal L" <vishal.l.verma@...el.com>
To: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-coco@...ts.linux.dev"
	<linux-coco@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "Gao, Chao" <chao.gao@...el.com>, "Edgecombe, Rick P"
	<rick.p.edgecombe@...el.com>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "Huang, Kai" <kai.huang@...el.com>,
	"kas@...nel.org" <kas@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
	"mingo@...hat.com" <mingo@...hat.com>, "Williams, Dan J"
	<dan.j.williams@...el.com>, "tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v2 0/2] x86/virt/tdx: Print TDX module version to dmesg

On Fri, 2026-01-09 at 12:14 -0700, Vishal Verma wrote:
> === Problem & Solution ===
> 
> Currently, there is neither an ABI, nor any other way to determine from
> the host system, what version of the TDX module is running. A sysfs ABI
> for this has been proposed in [1], but it may need additional discussion.
> 
> Many/most TDX developers already carry patches like this in their
> development branches. It can be tricky to know which TDX module is
> actually loaded on a system, and so this functionality has been needed
> regularly for development and processing bug reports. Hence, it is
> prudent to break out the patches to retrieve and print the TDX module
> version, as those parts are very straightforward, and get some level of
> debugability and traceability for TDX host systems.
> 
> === Dependencies ===
> 
> None. This is based on v6.19-rc4, and applies cleanly to tip.git.
> 
> === Patch details ===
> 
> Patch 1 is a prerequisite that adds the infrastructure to retrieve the
> TDX module version from its global metadata. This was originally posted in [2].
> 
> Patch 2 is based on a patch from Kai Huang [3], and prints the version to
> dmesg during init.
> 
> === Testing ===
> 
> This has passed the usual suite of tests, including successful 0day
> builds, KVM Unit tests, KVM selftests, a TD creation smoke test, and
> selected KVM tests from the Avocado test suite.
> 
> [1]: https://lore.kernel.org/all/20260105074350.98564-1-chao.gao@intel.com/
> [2]: https://lore.kernel.org/all/20260105074350.98564-2-chao.gao@intel.com/
> [3]: https://lore.kernel.org/all/57eaa1b17429315f8b5207774307f3c1dd40cf37.1730118186.git.kai.huang@intel.com/
> 
> Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>

Hi Kiryl, just wanted to check on the plan for this, I didn't see it
merged in tip.git x86/tdx (or any other tip branch). Were you planning
to take it through x86/tdx? Can I help with anything to move it along?

Thank you,
Vishal