Re: [Qemu-devel] [PATCH v2 9/9] tpm: Added support for TPM emulator

[Patrick Ohly]

On Mon, 2017-04-10 at 09:54 +0000, Marc-André Lureau wrote:

> By "public protocol", I mean qemu communication with a foreign
> project, swtpm or other.
> 
> If qemu grows new needs, or if the protocol is found limited or buggy,
> it may change. Subtle interactions may break between various
> implementations.  The minimum would be some versioning or
> capabilities. A document describing the states and messages
> allowed/denied & effects would be quite necessary.

Stefan, is there any documentation besides the source?

Just asking, I don't think it is needed because...

> Otoh, there doesn't seem to be other users of this protocol, or other
> implementations. So it may make sense to make it qemu-specific, and
> thus "private": the protocol and implementation can evolve without
> risk to break other users. This gives us a lot more flexibility and
> control, and doesn't have to be very strictly documented (although it
> is still better to be strict, but requires more effort).

... I suspect it falls into this camp. I can't think of any users of the
protocol besides swtpm itself and now qemu. Stefan, is that correct?

-- 
Best Regards, Patrick Ohly

The content of this message is my personal opinion only and although
I am an employee of Intel, the statements I make here in no way
represent Intel's position on the issue, nor am I authorized to speak
on behalf of Intel on this matter.