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

From: Stefan Berger
Subject: Re: [Qemu-devel] [PATCH v2 9/9] tpm: Added support for TPM emulator
Date: Mon, 10 Apr 2017 12:14:10 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 04/10/2017 06:07 AM, Patrick Ohly wrote:
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?

Correct. Only swtpm client tools (swtpm_ioctl) and now your QEMU patches are using the protocol.

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