linux-kernel - RE: [Regression 4.15-rc2] New messages `tpm tpm0: A TPM error (2314) occurred continue selftest`

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Date:   Fri, 15 Dec 2017 14:39:53 +0000
From:   <Mario.Limonciello@...l.com>
To:     <pmenzel@...gen.mpg.de>, <Alexander.Steffen@...ineon.com>,
        <jgg@...pe.ca>
CC:     <linux-integrity@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <rafael.j.wysocki@...el.com>, <len.brown@...el.com>
Subject: RE: [Regression 4.15-rc2] New messages `tpm tpm0: A TPM error (2314)
 occurred continue selftest`

> -----Original Message-----
> From: Paul Menzel [mailto:pmenzel@...gen.mpg.de]
> Sent: Friday, December 15, 2017 5:54 AM
> To: Limonciello, Mario <Mario_Limonciello@...l.com>; Alexander Steffen
> <Alexander.Steffen@...ineon.com>; Jason Gunthorpe <jgg@...pe.ca>
> Cc: linux-integrity@...r.kernel.org; linux-kernel@...r.kernel.org; Rafael J.
> Wysocki <rafael.j.wysocki@...el.com>; Len Brown <len.brown@...el.com>
> Subject: Re: [Regression 4.15-rc2] New messages `tpm tpm0: A TPM error (2314)
> occurred continue selftest`
> 
> [Adding Rafael and Len as they, to my knowledge, also use or have a
> access to a Dell XPS 13 9360. With latest Linux master do you get TPM
> self-test errors, when cold starting the system without the power supply
> plugged in?]
> 
> Dear Mario, dear Alexander,
> 
> 
> the added line breaks to the quoted parts really mess up the citation.
> Can we please try to use MUAs avoiding that, or fixing that manually?

I don't know what you mean.  I think this is directed at Alexander?
If this is directed to me I can't change mail clients, sorry.

<snip>

> >
> > Yes it's required for the TPM model/vendor that is used in the XPS model that
> > Paul has.  If you try to run the upgrade without clearing it the firmware will
> > reject the upgrade.
> 
> Mario, thank you for your quick reaction.
> 
> […]
> 
> 1.  Can you reproduce this issue too?

I haven't seen this, but if this is a regression I also have not run anything
later than 4.15-rc1 right now.

> 2.  How do I find out, what TPM firmware version is installed?

fwupd will tell you.  Documentation (and code) here:
https://github.com/hughsie/fwupd/tree/master/plugins/dell

> 3.  Updating to the firmware 2.4.2 from December 17th, 2017 didn’t fix

The TPM in the XPS is a discrete TPM that is treated separately from the system
firmware payload.  It supports both a "1.2" and a "2.0" firmware. 

It is independently flashed from a separate TPM payload that is distributed
on LVFS.