Hi Jarkko, On Mon, 2024-05-20 at 02:51 +0300, Jarkko Sakkinen wrote: > Causes performance drop in initialization so needs to be opt-in. > Distributors are capable of opt-in enabling this. Could be also handled by > kernel-command line in the future. > > Reported-by: Vitor Soares <ivitro@xxxxxxxxx> > Closes: > https://lore.kernel.org/linux-integrity/bf67346ef623ff3c452c4f968b7d900911e250c3.camel@xxxxxxxxx/#t > Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation") > Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx> > --- > drivers/char/tpm/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig > index e63a6a17793c..db41301e63f2 100644 > --- a/drivers/char/tpm/Kconfig > +++ b/drivers/char/tpm/Kconfig > @@ -29,7 +29,7 @@ if TCG_TPM > > config TCG_TPM2_HMAC > bool "Use HMAC and encrypted transactions on the TPM bus" > - default y > + default n > select CRYPTO_ECDH > select CRYPTO_LIB_AESCFB > select CRYPTO_LIB_SHA256 I did the test on my side, and with TCG_TPM2_HMAC set to "n" the time to probe tpm_tis_spi driver has reduced to: real 0m2.009s user 0m0.001s sys 0m0.019s Thanks for your help. Best regards, Vitor Soares
