linux-kernel - Re: [PATCH v2] tpm: return a TPM_RC_COMMAND_CODE response if a command isn't implemented

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Date:   Wed, 29 Nov 2017 19:57:38 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Philip Tricca <philip.b.tricca@...el.com>,
        linux-integrity@...r.kernel.org,
        William Roberts <william.c.roberts@...el.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH v2] tpm: return a TPM_RC_COMMAND_CODE response if a
 command isn't implemented

On Wed, Nov 29, 2017 at 12:08:46PM +0100, Javier Martinez Canillas wrote:
> +#define TPM2_RC_LAYER_SHIFT	16
> +#define TPM2_RESMGRTPM_RC_LAYER (11 << TPM2_RC_LAYER_SHIFT)

I got this spec from Philip [1].

Couple of remarks:

* What is the difference between TSS2_RESMGR_RC_LAYER and
  TSS2_RESMGR_TPM_RC_LAYER?
* Should the driver code use TSS2 or TPM2 prefix?

[1] https://trustedcomputinggroup.org/wp-content/uploads/TCG-TSS-2.0-Overview-and-Common-Structures-Specification-Version-0.90-Revision-02.pdf

/Jarkko