[tpm2] question: how to test a case where the selftest command fails

[tpm2] question: how to test a case where the selftest command fails

[Dafna Hirschfeld]

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Hi,
I am working for Collabora on a list of patches in the Chromeos kernel.
I want to check if I can upstream those patches to the mainline kernel.
There is one patch [1] to ignore the case that the 'selftest' command failed
when adding the '/dev/tpm' device. The idea is that userspace could still interact with the
device to some extent event if it fails.
I was wandering how do I test such a case.
I thought that I can test it with a tpm emulator and change the emulator code
to fail on 'selftest'.
I am new to TPM and still know little about it so I thought maybe
some of the people here have better ideas?

[1] https://chromium.googlesource.com/chromiumos/third_party/kernel/+/1065c2fe54d6%5E%21/

Thanks a lot,
Dafna Hirschfeld.