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Re: [Qemu-devel] [PATCH V13 6/7] Introduce --enable-tpm-passthrough conf

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH V13 6/7] Introduce --enable-tpm-passthrough configure option
Date: Tue, 13 Dec 2011 15:51:35 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, Dec 13, 2011 at 07:51:17AM -0500, Stefan Berger wrote:
> On 12/12/2011 11:51 PM, Paul Brook wrote:
> >>>>+tpm_passthrough="no"
> >>>Same as before, please probe for existence.
> >>We would be probing for /dev/tpm0. Is that really what we want that this
> >>driver only gets compiled if /dev/tpm0 is (currently) available?
> >If what you say is true then this code should always be enabled.
> >
> Michael Tsirkin previously requested that there be an option for the
> TPM passthrough driver to be selectively enabled since at least
> using /dev/tpm0 may not be what everybody wants. The passthrough
> driver at some point will also be able to use sockets to communicate
> with a TPM when a file descriptor is passed to Qemu, so maybe that
> changes then?
>    Stefan

The passthrough as it is, is pretty easy to misuse.
This is a hardware problem, not software, and
I don't think it's fixable.

So I do not think all downstreams will want to support this
mode, making it easy to disable this is IMO important.


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