linux-kernel - Re: [PATCH v4 2/6] tpm, tpm_tis: Claim and release locality only once

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Message-ID: <Yn6cjJTj1SdS73pY@kernel.org>
Date:   Fri, 13 May 2022 20:59:40 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Lino Sanfilippo <LinoSanfilippo@....de>
Cc:     peterhuewe@....de, jgg@...pe.ca, stefanb@...ux.vnet.ibm.com,
        linux@...ewoehner.de, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, lukas@...ner.de,
        p.rosenberger@...bus.com, Lino Sanfilippo <l.sanfilippo@...bus.com>
Subject: Re: [PATCH v4 2/6] tpm, tpm_tis: Claim and release locality only once

On Wed, May 11, 2022 at 09:29:57PM +0200, Lino Sanfilippo wrote:
> 
> 
> On 11.05.22 at 13:27, Jarkko Sakkinen wrote:
> > On Mon, May 09, 2022 at 10:05:55AM +0200, Lino Sanfilippo wrote:
> >> From: Lino Sanfilippo <l.sanfilippo@...bus.com>
> >>
> >> It is not necessary to claim and release the default locality for each TPM
> >> command. Instead claim the locality once at driver startup and release it
> >> at driver shutdown.
> >>
> >> Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
> >
> > We are doing what we're being because of Intel TXT:
> >
> > https://lore.kernel.org/tpmdd-devel/20170315055738.11088-1-jarkko.sakkinen@iki.fi/
> >
> > Unfortunately cannot accept this change.
> >
> 
> I do not see how the patch affects the crb code since the only changes concern the
> tpm_class_ops of the tis core. AFAICS crb uses its own set of tpm_class_ops
> which are still used to claim and release the locality.
> 
> Or do I miss something?

Ugh, yes breaking everything when TXT is used with tpm_tis.

> Regards,
> Lino

BR, Jarkko