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From: | Stefan Berger |
Subject: | Re: [Qemu-devel] [PATCH V2 4/9] Add tpm_tis driver to build process |
Date: | Tue, 05 Apr 2011 20:12:58 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Lightning/1.0b3pre Thunderbird/3.1.7 |
On 04/05/2011 02:55 PM, Blue Swirl wrote:
That device would be of no use for a user and only serve the purpose of test-compiling it if it was for detecting bit rot.On Tue, Apr 5, 2011 at 9:33 PM, Stefan Berger <address@hidden> wrote:On 04/05/2011 01:45 PM, Blue Swirl wrote:On Tue, Apr 5, 2011 at 5:08 AM, Stefan Berger <address@hidden> wrote:On 04/03/2011 05:20 AM, Blue Swirl wrote:On Fri, Apr 1, 2011 at 10:57 PM, Stefan Berger <address@hidden> wrote:On 04/01/2011 02:14 PM, Blue Swirl wrote: At this point there is no compile test needed since all code is 'there'. It's merely adding the front-end,i.e., the TPM TIS emulation to be compiled.If the basic device (without the tpms-devel library) can be built on any OS, the flag should go to default-configs/*86*-softmmu.mak.It can be built on any OS, but it is of no use since the backend (libtpms) is only available on Linux and we don't support it on another OS. Unless someone else wants to port it to other OSes, I'd say that the test for Linux is useful. I'd actually also only compile the TIS if libtpms could be found, and terminate with an error message otherwise. I would add this restriction only in the last patch, so that in patch 4 at least for now the TIS can be built. Does that sound reasonable?It should be possible to emulate the device (to some degree) without relying on backend. See for example the recently committed smart card device.In case of a TPM, the specs are huge and translate into multiple 10k lines of code. If there was to be a dummy backend, all it could send back would be error messages...Then how about emulating the library instead so that all calls return failure?
I'll be following the project and there is interest to keep this device working.If a device is built only in special circumstances, it will be more prone to bit rot. We have a few such devices though, so it's not so big deal.
Stefan
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