RE: [Xen-devel] vTPM in dom0

["Cihula, Joseph" <joseph.cihula@xxxxxxxxx>]

On Friday, March 14, 2008 5:52 AM, Tom Buhl wrote:
> Hi,
> 
> yesterday I posted a question to the xen-users list concerning usage
of the
> TPM in dom0. 
> This is the original message:
> "I am using Xen 3.2.0 and want to use the TPM in dom0. I have
activated vtpm
> and everything runs fine in my domUs. 
> The question is, how can I access the TPM in dom0? As far as I know
> vtpm_managerd exclusively locks /dev/tpm0. As soon as I start
vtpm_managerd
> my own program cannot access the TPM anymore. Is there a vtpm instance
for
> dom0 like the ones for the user domains?"   
> 
> Anna Fischer replied with the suggestion to ask this list, if there
has been
> any development recently in that direction. Is there a way to use the
TPM in
> dom0?  
> 
> Thanks in advance,
> 
> Tom

This was asked previously as part of a different thread
(http://lists.xensource.com/archives/html/xen-devel/2007-07/msg00812.htm
l), and the basic answer is that it was intended that only vTPM Manager
would have access to the physical TPM in dom0.  As such, it was written
with a stripped-down version of a TSS embedded withing itself, rather
than to use an external TSS (e.g. TrouSerS).

What is it that you would like to do with the physical TPM?

Joe

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