There is no load and flush the null key for every transaction. It only needs to be flushed when user space accesses TPM. This postpones the flush up to that point.
The goal is to take the first step addressing [1]. Other performance improvements are needed too but this is the most obvious one and easiest to address. [1] https://bugzilla.kernel.org/show_bug.cgi?id=219229 Jarkko Sakkinen (4): tpm: remove file header documentation from tpm2-sessions.c tpm: address tpm2_create_null_primary() return value tpm: address tpm2_create_primary() failure tpm: flush the session null key only when required drivers/char/tpm/tpm-chip.c | 13 ++++ drivers/char/tpm/tpm-dev-common.c | 7 ++ drivers/char/tpm/tpm-interface.c | 9 ++- drivers/char/tpm/tpm2-cmd.c | 3 + drivers/char/tpm/tpm2-sessions.c | 115 ++++++++++-------------------- include/linux/tpm.h | 2 + 6 files changed, 68 insertions(+), 81 deletions(-) -- 2.46.0
