Re: [PATCH v5 4/5] Initialize TPM and get durations and timeouts

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

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Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> wrote on 02/09/2016 
10:56:20 PM:

> 
> On Tue, Feb 09, 2016 at 09:52:28AM -0700, Jason Gunthorpe wrote:
> > On Tue, Feb 09, 2016 at 11:19:15AM -0500, Stefan Berger wrote:
> > > Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> wrote on 02/
> 09/2016 12:33:23
> > > AM:
> > > 
> > > 
> > > >
> > > > On Mon, Feb 08, 2016 at 02:27:07PM -0500, Stefan Berger wrote:
> > > > > Add the retrieval of TPM 1.2 durations and timeouts. Since 
> this requires
> > > > > the startup of the TPM, do this for TPM 1.2 and TPM 2.
> > > > >
> > > > > To not allow to interleave with commands from user space, so 
send the
> > > > > TPM_Startup as the first command. The timeouts can then be 
> gotten at any
> > > > > later time, even interleaved with commands from user space.
> > > >
> > > > Do not call tpm_register until get_timeouts has completed and this
> > > > will naturally be avoided the same way every other TPM driver 
does.
> > > 
> > > Getting the timeouts cannot complete before the TPM emulator has
> started, which
> > > in turn cannot start before the ioctl returns. We don't know 
> whether user space
> > > starts a client first on /dev/tpm1 or the TPM emulator starts 
> first on the file
> > > descriptor. We can control which command gets *queued* for the 
> TPM emulator and
> > > that's what I am doing by having the kernel queue the startup 
> command first.
> > 
> > I keep saying this same solution - start a work queue just before the
> > ioctl returns and do the get_timeouts and registration in there.
> 
> *Maybe* it would be worth to check David's patch:
> 
> https://github.com/PeterHuewe/linux-tpmdd/commit/
> 9329f13c403daf1f4bd1e715d2ba0866e089fb1d


Redid that now.

https://github.com/stefanberger/linux/commit/83019eaab2cf5eb33f2665efdf9d2a117ed703b2
   Stefan
> 
> /Jarkko
> 



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