linux-kernel - Re: [PATCH] tpm: ibmvtpm: Call tpm2_sessions

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Message-Id: <D2FHNOGO624G.HX2SKHYFXU4L@kernel.org>
Date: Wed, 03 Jul 2024 03:48:00 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Jarkko Sakkinen" <jarkko.sakkinen@....fi>, "Stefan Berger"
 <stefanb@...ux.ibm.com>, "Linux regressions mailing list"
 <regressions@...ts.linux.dev>
Cc: <naveen.n.rao@...ux.ibm.com>, <linux-kernel@...r.kernel.org>,
 <linux-integrity@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] tpm: ibmvtpm: Call tpm2_sessions_init() to initialize
 session support

On Wed Jul 3, 2024 at 3:34 AM EEST, Jarkko Sakkinen wrote:
> https://lore.kernel.org/linux-integrity/20240703003033.19057-1-jarkko@kernel.org/T/#u
>
> There's also bunch of other drivers than tpm_ibmvtpm so better
> to limit it to known good drivers.
>
> I can take at the actual issue in August and will review any
> possible patches then. This one I'll send after my current PR
> for TPM has been merged.

After this patch has been merged to mainline, you can send your change
as a feature patch for tpm_ibmvtpm and replace Kconfig line with
"depends on ... || TCG_IBMVTPM".

This zeros the risk other drivers than tpm_tis, tpm_crb and tpm_ibmvtpm,
and thus is the only possible solution that I'm willing to accept in
*fast phase*". I.e. the most conservative and guaranteed route, like
anyone with sane mind should really.

BR, Jarkko