linux-kernel - Re: tpm_tis TPM2.0 not detected on cold boot

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Date:   Tue, 01 Jan 2019 17:15:40 +0100
From:   Michael Niewöhner <linux@...ewoehner.de>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        peterhuewe@....de, jgg@...pe.ca, arnd@...db.de,
        linux-integrity@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Ken Goldman <kgold@...ux.ibm.com>
Subject: Re: tpm_tis TPM2.0 not detected on cold boot

On Mon, 2018-12-31 at 16:17 -0500, Mimi Zohar wrote:
> On Sun, 2018-12-30 at 14:22 +0100, Michael Niewöhner wrote:
> 
> > > difference is that on a cold boot, the TPM takes longer to initialize.
> > 
> > Well, as I said. Waiting for 10, 20 or even 60 seconds in the boot manager
> > does
> > not solve the problem. So the problem is NOT that the TPM takes longer to
> > initialize. Even adding a delay of 20 seconds before TPM init does not solve
> > that while that should be more than enough time.
> 
> The purpose of commenting out the TPM2 selftest was to minimize the
> TPM initialization delay, so that the TPM is ready before IMA.  After
> James' patch that wasn't needed anymore.
> 
> Looking back at this thread, I see you're using systemd-boot, not
> grub2.  When you commented out the systemd-boot timeout, IMA found the
> TPM.  The question is why isn't the TPM ready with the timeout before
> IMA (like above)?  Has systemd-boot done the selftest?

I am not sure wether systemd-boot touches TPM at all but I get the same
behaviour with syslinux-efi.

> 
> Mimi
>