linux-kernel - Re: [PATCH v3 00/10] tpm: Decouple Trenchboot dependencies

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Message-ID: <aNrnxxPv6IuykrYH@kernel.org>
Date: Mon, 29 Sep 2025 23:10:47 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: dpsmith@...rtussolutions.com, ross.philipson@...cle.com,
	David Howells <dhowells@...hat.com>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"open list:KEYS/KEYRINGS" <keyrings@...r.kernel.org>,
	"open list:SECURITY SUBSYSTEM" <linux-security-module@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 00/10]  tpm: Decouple Trenchboot dependencies

On Mon, Sep 29, 2025 at 10:48:22PM +0300, Jarkko Sakkinen wrote:
> Overview
> ========
> 
> Decouple TPM driver features relevant for Trenchboot and make tpm-buf
> robust and decoupled entity from the rest of driver. By doing this, code
> can be easily linked to the early boot code.
> 
> Backlog
> =======
> 
> Parts of tpm_tis should separated and decouple from the driver code so that
> the slices of code can be compiled into early boot code. Since by other
> means the series already has most of the gaps filled it's better to resolve
> this issue before landing the series.

I.e. goal is that redundancy is mostly in the glue not in replicated
code that we want to fix regressions at one place.

These patches address end-to-end efficient building and parsing of
PCR extends with super-relaxed mm-requirements (stack will do), and
tpm_tis is the final piece.

BR, Jarkko