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Re: [PATCH V2 2/3] verifiers: Core TPM support

From: Matthew Garrett
Subject: Re: [PATCH V2 2/3] verifiers: Core TPM support
Date: Mon, 26 Nov 2018 17:00:03 +1100

On Mon, Nov 26, 2018 at 4:47 PM Daniel Kiper <address@hidden> wrote:

> I have a feeling that both UEFI and TIS TPM implementations can coexists
> together even on UEFI platform. Of course, AIUI, UEFI TPM should be default
> if we play with TPM 2.0. TIS implementation should be used with TPM 1.2
> or if UEFI is buggy and its hooks does not work well with TPM 2.0.
> Does it make sense?

The implementation here should work fine with TPM 1.2, so the only
reason to avoid the UEFI implementation is if it's buggy - but given
current versions of Windows will use the TPM by default if it's
available, I'd be surprised if there's any significant bugs in the
wild. I'm not sure there's a real case where you'd have a TPM on a
UEFI system without having working firmware support, and if you don't
have the firmware support I don't know how you'd discover the TPM in
the first place (eg, if it's on SPI we'd need a full SPI
implementation in grub to talk to it)

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