linux-kernel - Re: [PATCH v13 00/19] x86: Trenchboot secure dynamic launch Linux kernel support

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Message-ID: <Z-faPSIlZV91j_Z0@kernel.org>
Date: Sat, 29 Mar 2025 13:32:13 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Ross Philipson <ross.philipson@...cle.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-crypto@...r.kernel.org, kexec@...ts.infradead.org,
	linux-efi@...r.kernel.org, iommu@...ts.linux.dev,
	dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
	bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com,
	ardb@...nel.org, mjg59@...f.ucam.org,
	James.Bottomley@...senpartnership.com, peterhuewe@....de,
	jgg@...pe.ca, luto@...capital.net, nivedita@...m.mit.edu,
	herbert@...dor.apana.org.au, davem@...emloft.net, corbet@....net,
	ebiederm@...ssion.com, dwmw2@...radead.org,
	baolu.lu@...ux.intel.com, kanth.ghatraju@...cle.com,
	andrew.cooper3@...rix.com, trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v13 00/19] x86: Trenchboot secure dynamic launch Linux
 kernel support

On Fri, Mar 28, 2025 at 04:07:55PM -0700, Ross Philipson wrote:
> The larger focus of the TrenchBoot project (https://github.com/TrenchBoot) is to
> enhance the boot security and integrity in a unified manner. The first area of
> focus has been on the Trusted Computing Group's Dynamic Launch for establishing
> a hardware Root of Trust for Measurement, also know as DRTM (Dynamic Root of
> Trust for Measurement). The project has been and continues to work on providing
> a unified means to Dynamic Launch that is a cross-platform (Intel and AMD) and
> cross-architecture (x86 and Arm), with our recent involvment in the upcoming
> Arm DRTM specification. The order of introducing DRTM to the Linux kernel
> follows the maturity of DRTM in the architectures. Intel's Trusted eXecution
> Technology (TXT) is present today and only requires a preamble loader, e.g. a
> boot loader, and an OS kernel that is TXT-aware. AMD DRTM implementation has
> been present since the introduction of AMD-V but requires an additional
> component that is AMD specific and referred to in the specification as the
> Secure Loader, which the TrenchBoot project has an active prototype in
> development. Finally Arm's implementation is in specification development stage
> and the project is looking to support it when it becomes available.
> 
> This patchset provides detailed documentation of DRTM, the approach used for
> adding the capbility, and relevant API/ABI documentation. In addition to the
> documentation the patch set introduces Intel TXT support as the first platform
> for Linux Secure Launch.
> 
> A quick note on terminology. The larger open source project itself is called
> TrenchBoot, which is hosted on Github (links below). The kernel feature enabling
> the use of Dynamic Launch technology is referred to as "Secure Launch" within
> the kernel code. As such the prefixes sl_/SL_ or slaunch/SLAUNCH will be seen
> in the code. The stub code discussed above is referred to as the SL stub.

I did a quick recap of TPM patches and still looks good as far as I'm
concerned. Not actively reviewing these anymore but I'll do a sanity
check per patch set version.

BR, Jarkko