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

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Date: Fri, 28 Jun 2024 12:39:08 -0400
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Michael Ellerman <mpe@...erman.id.au>, regressions@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org, naveen.n.rao@...ux.ibm.com, Stefan Berger
	 <stefanb@...ux.ibm.com>, linux-integrity@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, jarkko@...nel.org
Subject: Re: [PATCH] tpm: ibmvtpm: Call tpm2_sessions_init() to initialize
 session support

On Fri, 2024-06-28 at 10:54 +1000, Michael Ellerman wrote:
> Stefan Berger <stefanb@...ux.ibm.com> writes:
> > Fix the following type of error message caused by a missing call to
> > tpm2_sessions_init() in the IBM vTPM driver:
> > 
> > [    2.987131] tpm tpm0: tpm2_load_context: failed with a TPM error
> > 0x01C4
> > [    2.987140] ima: Error Communicating to TPM chip, result: -14
> > 
> > Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation")
> > Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> > ---
> >  drivers/char/tpm/tpm_ibmvtpm.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/char/tpm/tpm_ibmvtpm.c
> > b/drivers/char/tpm/tpm_ibmvtpm.c
> > index d3989b257f42..1e5b107d1f3b 100644
> > --- a/drivers/char/tpm/tpm_ibmvtpm.c
> > +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> > @@ -698,6 +698,10 @@ static int tpm_ibmvtpm_probe(struct vio_dev
> > *vio_dev,
> >                 rc = tpm2_get_cc_attrs_tbl(chip);
> >                 if (rc)
> >                         goto init_irq_cleanup;
> > +
> > +               rc = tpm2_sessions_init(chip);
> > +               if (rc)
> > +                       goto init_irq_cleanup;
> >         }
> >  
> >         return tpm_chip_register(chip);
> 
> #regzbot ^introduced: d2add27cf2b8 

Could you please test out the patch I proposed for this:

https://lore.kernel.org/linux-integrity/1302b413a2d7bf3b275133e7fdb04b44bfe2d5e3.camel@HansenPartnership.com/

Because it's not just tmp_ibmvtpm that doesn't call autostart.  From
inspection xen-tpmfront, tmp_nsc, tpm_infineon and tpm_atmel also
don't, so it would be better to fix this for everyone rather than just
for you and have to do a separate fix for each of them.

James