linux-kernel - Re: [PATCH 1/3] tpm: Disable TCG_TPM2

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Date: Wed, 22 May 2024 19:11:23 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Vitor Soares" <ivitro@...il.com>, "James Bottomley"
 <James.Bottomley@...senPartnership.com>, <linux-integrity@...r.kernel.org>
Cc: <keyrings@...r.kernel.org>, "Peter Huewe" <peterhuewe@....de>, "Jason
 Gunthorpe" <jgg@...pe.ca>, "Mimi Zohar" <zohar@...ux.ibm.com>, "David
 Howells" <dhowells@...hat.com>, "Paul Moore" <paul@...l-moore.com>, "James
 Morris" <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>,
 <linux-kernel@...r.kernel.org>, <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 1/3] tpm: Disable TCG_TPM2_HMAC by default

On Wed May 22, 2024 at 5:58 PM EEST, Vitor Soares wrote:
> I did run with ftrace, but need some more time to go through it.
>
> Here the step I did:
> kernel config:
>   CONFIG_FUNCTION_TRACER
>   CONFIG_FUNCTION_GRAPH_TRACER
>
> ftrace:
>   # set filters
>   echo tpm* > set_ftrace_filter
>
>   # set tracer
>   echo function_graph > current_tracer
>
>   # take the sample
>   echo 1 > tracing_on; time modprobe tpm_tis_spi; echo 0 > tracing_on
>
> regards,
> Vitor Soares

I'm now compiling distro kernel (OpenSUSE) for NUC7 with v6.10 contents.

After I have that setup, I'll develop a perf test either with perf or
bpftrace. I'll come back with the possible CONFIG_* that should be in
place in your kernel. Might take up until next week as I have some
conference stuff to prepare but I try to have stuff ready early next
week.

No need to rush with this as long as possible patches go to rc2 or rc3.
Let's do a proper analysis instead.

In the meantime you could check if you get perf and/or bpftrace to 
your image that use to boot up your device. Preferably both but
please inform about this.

Fair enough?

BR, Jarkko