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

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Date: Thu, 23 May 2024 08:59:26 +0100
From: Vitor Soares <ivitro@...il.com>
To: Jarkko Sakkinen <jarkko@...nel.org>, 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, 2024-05-22 at 19:11 +0300, Jarkko Sakkinen wrote:
> 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.
> 

I already have perf running, for the bpftrace I might not be able to help.

Regards,
Vitor Soares

> Fair enough?
> 
> BR, Jarkko