Thanks a lot faro...@br.ibm.com. Especially for noting the known firmware featues influencing this in your case and then combining cap-ibs=workaround,cap-ccf-assist=on to prove the new features work.
I see that cap-ccf-assist=on can be used and successfully grants the guest [ 0.000000] count-cache-flush: hardware assisted flush sequence enabled The one thing I wondered is your #7 showing cap-ibs=workaround not working. Could that be another missed kernel patch as we have seen it working in #2. Could you please add and run the following cases to your list: *** 8- Bionic-proposed kernel + Disco-updates QEMU *** 9- Bionic-proposed kernel + Disco-proposed QEMU In those (at least) test "cap-ibs=workaround" and "cap-ibs=workaround,cap-ccf-assist=on" With those two tests on top we can check if: - if cap-ibs=workaround works in #8 but we know it failed in #7 => the Disco kernel broke it in #7 => We'd need to find what else the Disco kernel misses vs Bionic. - if cap-ibs=workaround works in #8 but fails in #9 => the new disco qemu update breaks it => We'd need to find why -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1832622 Title: QEMU - count cache flush Spectre v2 mitigation (CVE) (required for POWER9 DD2.3) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1832622/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
