------- Comment From kurzg...@fr.ibm.com 2018-04-13 10:57 EDT------- (In reply to comment #6) > TL;DR I'd ask you to: > - evaluate if a (much) simpler fix would be available
Yeah, I believe we can come up with something slightly simpler. The kernel for 18.04 is 4.15, hence KVM supports setting the VSMT, and we can drop all the patches that deal with kvmppc_smt_threads() != spapr->vsmt. This means the following patches can be dropped from the backport: lp-1763468-1-spapr-Allow-some-cases-where-we-can-t-set-VSMT-mode-.patch lp-1763468-4-spapr-use-spapr-vsmt-to-compute-VCPU-ids.patch These ones are cleanup and can be dropped: lp-1763468-5-spapr-move-VCPU-calculation-to-core-machine-code.patch lp-1763468-6-spapr-rename-spapr_vcpu_id-to-spapr_get_vcpu_id.patch lp-1763468-7-spapr-consolidate-the-VCPU-id-numbering-logic-in-a-s.patch This one fixes a regression from the above cleanup and can be dropped: lp-1763468-8-spapr-fix-missing-CPU-core-nodes-in-DT-when-running-.patch But we still need to adjust the default VSMT value, so we want to keep these: lp-1763468-2-spapr-Adjust-default-VSMT-value-for-better-migration.patch lp-1763468-3-spapr-set-vsmt-to-MAX-8-smp_threads.patch and we also need to register dummy ICPs later, to "fix just the issue". This requires to adapt lp-1763468-9-spapr-register-dummy-ICPs-later.patch to the fact that xics_max_server_number() doesn't take arguments. The following does the trick: perl -i -p -e 's/xics_max_server_number\(spapr\)/xics_max_server_number()/' \ lp-1763468-9-spapr-register-dummy-ICPs-later.patch So you end up with 3 patches and a nicer diffstat: hw/ppc/spapr.c | 35 ++++++++++++++++++++--------------- 1 file changed, 20 insertions(+), 15 deletions(-) Is it enough for you to go forward ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763468 Title: [Ubuntu 18.04] P8 compat mode migration fails for Ubuntu 16.04.4 P8 Guest from Ubuntu 16.04.4 P8 Host -> Ubuntu 18.04 P9 Host To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1763468/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
