Re: regarding vtpm setup

[Daniel De Graaf <dgdegra@tycho.nsa.gov>]

On 03/07/2014 07:19 AM, Aastha Mehta wrote:
> Hello,
>
> Thank you for your response.
>
[...]
>>
>>
>> Have you tested to see if the vTPM shows up in the guest? If so, can you use
>> it?
>>
>
> I can see /dev/tpm0 in the guest. And I am able to use the vtpm in the
> guest So far, I did only tpm_version, but I see messages showing up on
> the vtpm and the vtpmmgr console.

This indicates that the vTPM is working as it is supposed to.

>> What do the Xenstore entries for the vtpm devices look like (from
>> xenstore-ls)?
>>
>> Do the event channels there match with the event channel dump (xl debug-key
>> e)?
>>
>
> I see a lot of entries in xl debug-keys dump. I can match all the
> event channels in the xenstore entries with the ones from xl
> debug-keys dump. However, there are some entries in xl debug-keys
> which I cannot find in xenstore. I do not understand what those are..
>
> The ones that match are appended with "<<".
> Note, vtpmmgr = domid 2, vtpm = domid 3, guest = domid 4.

Event channels can be created for other reasons besides those recorded
in xenstore: the xenstore event channel itself and the guest console
are some examples. If you are getting TPM responses, the event channels
are wired up correctly.

-- 
Daniel De Graaf
National Security Agency