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

[ross . philipson]

On 3/29/25 4:32 AM, Jarkko Sakkinen wrote:
> On Fri, Mar 28, 2025 at 04:07:55PM -0700, Ross Philipson wrote:
> > The larger focus of the TrenchBoot project (https://urldefense.com/v3/__https://github.com/TrenchBoot__;!!ACWV5N9M2RV99hQ!O3YD_Gg-b5rJB_LxeqAKq7YGMDlmbkk1dUS2khRWPxGpRgR36kf2jpRZPcmqJD83GOvjam2SUAJ1J5iy914$ ) 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.

Thank you Jarkko for all you feedback and help.

Ross

> BR, Jarkko