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Re: [Xen-devel] [PATCH] [Linux] Transfer TPM locality info in the ringstructure

Personally I do not much care about compatibility of new backend with old frontend, or vice versa, since I doubt that the vtpm drivers have many users. But others with an interest in the vtpm drivers might care, as the errors that mismatched drivers will cause are likely to be moderately hard to debug. If compatibility is required, you’ll have to negotiate the new request format via xenstore. It’s not that hard: see the request-foo/feature-foo handshake that goes on e.g., between netfront and netback.

 -- Keir

On 7/1/08 11:53, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:

Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote on 01/06/2008 06:12:06 PM:

> How does that fix the problem if an old tpm frontend runs against a
> new tpm backend? The unused field will not be initialised by the old
> frontend, hence can contain garbage to confuse the new backend?

I don't know of any better solution than initializing this 'now'.

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