Re: [Qemu-devel] [PATCH V2 4/9] Add tpm_tis driver to build process

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

On 04/05/2011 01:45 PM, Blue Swirl wrote:
> On Tue, Apr 5, 2011 at 5:08 AM, Stefan Berger
> <stefanb@linux.vnet.ibm.com>  wrote:
>> On 04/03/2011 05:20 AM, Blue Swirl wrote:
>>> On Fri, Apr 1, 2011 at 10:57 PM, Stefan Berger
>>> <stefanb@linux.vnet.ibm.com>    wrote:
>>>> On 04/01/2011 02:14 PM, Blue Swirl wrote:
>>>>
>>>> At this point there is no compile test needed since all code is 'there'.
>>>> It's merely adding the front-end,i.e., the TPM TIS emulation to be
>>>> compiled.
>>> If the basic device (without the tpms-devel library) can be built on
>>> any OS, the flag should go to default-configs/*86*-softmmu.mak.
>>>
>> It can be built on any OS, but it is of no use since the backend (libtpms)
>> is only available on Linux and we don't support it on another OS. Unless
>> someone else wants to port it to other OSes, I'd say that the test for Linux
>> is useful.
>> I'd actually also only compile the TIS if libtpms could be found, and
>> terminate with an error message otherwise. I would add this restriction only
>> in the last patch, so that in patch 4 at least for now the TIS can be built.
>> Does that sound reasonable?
> It should be possible to emulate the device (to some degree) without
> relying on backend. See for example the recently committed smart card
> device.
>
In case of a TPM, the specs are huge and translate into multiple 10k 
lines of code. If there was to be a dummy backend, all it could send 
back would be error messages...

    Stefan