Re: Question on Linux TSS architecture design (kernel vs. user space access)

["Stefan Berger" <stefanb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

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"Wilck, Martin" <martin.wilck-RJz4owOZxyXQFUHtdCDX3A@public.gmane.org> wrote on 12/18/2015 06:21:01 
AM:

> 
> On Do, 2015-12-17 at 10:23 -0500, Stefan Berger wrote:
> 
> > > kernel space. Can you point out a particular part of the problem
> > that
> > > could be solved better or more easily in user space?
> > 
> > User space would handle any number of client applications. It would
> > handle
> > the arbitration between applications from concurrent TPM usage while
> > one
> > application needs to access the TPM for a sequence of commands that
> > requires
> > access to session and key slots. This application can use the TPM
> > directly
> > with commands it passes through /dev/tpm0, so there's no need for a
> > higher
> > level API (provided by the TPM driver) for the usage of the TPM or the
> > need
> > to intercept commands where one application's usage of the TPM would
> > interfere with another application's usage of TPM, such as one
> > application
> > swapping out the context of another applications keys/session and/or
> > deleting
> > another applications session and key handles.
> 
> I had asked for things that user space could do *better* than the
> kernel. Could you point that out more clearly?

I don't think it can do things 'better' just keep it simpler in the 
kernel.

   Stefan



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