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

[Stefan Berger <stefanb@xxxxxxxxxx>]

"Cihula, Joseph" <joseph.cihula@xxxxxxxxx>
wrote on 01/03/2008 08:48:41 PM:

> On Wednesday, January 02, 2008 11:27 AM, Stefan Berger wrote:
> > Transfer TPM locality information in the ring structure. Add
a version
> > identifier to the ring structure for possible future extensions.
> > 
> > Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxx>
> 
> Stefan,
> 
> How do you expect to use the locality value and how would it get set
(to
> a non-zero value)?

The TIS interface offers the different address ranges
for using a locality. A TIS driver can make the localities available through
an ioctl(). A similar ioctl() could exist for the xen driver that allows
the client to choose which locality to use.

> 
> Since the locality value is provided by the originating domain, it
can't
> really be "trusted" by the backend without some other type
of
> validation.

Except for maybe checking that the value of the locality
is not out of range I don't see what else would need to be checked or is
there maybe some restriction for an OS to let applications use any other
locality than locality '0'?

   Stefan

> 
> Joe
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