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

From: Patrick Ohly
Subject: Re: [Qemu-devel] [PATCH v2 9/9] tpm: Added support for TPM emulator
Date: Mon, 10 Apr 2017 12:07:30 +0200

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.

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