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

[Stefan Berger <stefanb@xxxxxxxxxx>]

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'.

   Stefan


>  -- Keir
> 
> On 4/1/08 14:12, "Stefan Berger" <stefanb@xxxxxxxxxx>
wrote:

> > >  * Read data from the shared memory
and copy it directly into the
> > >  * provided buffer. Advance the read_last indicator
which tells
> > 
> > Also, while your patch at the first glance appears to take care
of backward
> > compatibility, I'm not sure it really does: In the old code,
I 
> can'tsee where
> > the 'unused' member of 'struct tpmif_tx_request' gets zero-initialized.
> 
> Yes, that's a problem. What I'll do is set the 'unused' member to
> zero and leave it at that.
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