about context gap

Ken Goldman kgold at linux.vnet.ibm.com
Tue Sep 26 18:46:59 UTC 2017

On 9/18/2017 2:02 PM, Jarkko Sakkinen wrote:

> Other than context gap it would probably make sense to estimate TPM
> capacity in order to make implementation more intelligent. We could
> measure memory capacity of a TPM in the driver initialization by filling
> it with fixed size dummy objects.
> TPM2_GetCapability gives stuff that cannot be really trusted as spec
> compliant TPM HW could just return always '1' for max.

I don't see anything in the TPM specs that claim the TPM can return 1.

E.g., the PC Client spec says that loaded sessions must return a minimum 
of 3.  Active sessions must return a minimum of 64.

I think the resource manager can safely use these getcapability values.

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