On 2020/4/15 2:07, Ken Goldman wrote:
I wonder if there's a different issue? I just ran selftest with
fullTest = yes in two different TPM vendors.
One took 230 msec, the other 320 msec.
I've never seen anything near 10 seconds.
Note that this is worse than the worst case because it's forcing a full
retest. The TPM typically starts its self test immediately at power up
and could be complete by the time the OS starts to boot.
When I run selftest with fullTest = no, I get 30 msec, probably
because it's not doing anything.
On 4/14/2020 7:50 AM, Tianjia Zhang wrote:
Because ima_pcr_extend() to operate the TPM chip, this process is
very time-consuming, for IMA, this is a blocking action, especially
when the TPM is in self test state, this process will block for up
to ten seconds.
Ten seconds is an extreme scenario, and I haven't seen this worst case,
but the TPM driver will fail to return in this scenario.
Thanks and best,
Tianjia
