------- Comment From <email address hidden> 2018-03-09 03:21 EDT-------
With Ubuntu bionic, kernel 4.15.0-11-generic #12-Ubuntu SMP Fri Feb 23 18:38:46 UTC 2018 s390x, I did not see any effect when switching kernel parameter between nobp=1 (secure) and nobp=0 (faster, but insecure). In the kenel config I could not find any option mentioning nobp either.
Attaching kernel config.
------- Comment From <email address hidden> 2018-03-09 03:21 EDT-------
With Ubuntu bionic, kernel 4.15.0-11-generic #12-Ubuntu SMP Fri Feb 23 18:38:46 UTC 2018 s390x, I did not see any effect when switching kernel parameter between nobp=1 (secure) and nobp=0 (faster, but insecure). In the kenel config I could not find any option mentioning nobp either.
Attaching kernel config.
The default should be nobp=1 with bionic
git commits required for kernel patches 144f811ffe8a195 c696b1e1d0 9a96b57bdd24227 b5f52288f5 611556bf00c48f9 45c77bcf02 6cd3aa000eb1867 bcf32db0ee e3dd1cd6eaab7de e552601efb 1c809596412dab1 ed56f2f156 d9e95ed222c2c8f 337181aa90 dbd9e2e1439afc2 f0af761ed4 d2aa5e26aed8b24 232096d0e1
# 7041d28115e91f2
# e2dd833389cc406
# cf1489984641369
# d768bd892fc8f06
# 6b73044b2b0081e
# f19fbd5ed642dc3
# 2cb370d615e9fbe
# d5feec04fe578c8
# d3f468963cd6fd6
Ubuntu 18.04 kernel patches