I haven't went into too much depth on this for this sniff test, but migrations also didn't trigger issues for me into the new builds and back.
I tried a host-passthrough and a host-model migration, the latter was expanded to (started on the old host): <model fallback='forbid'>EPYC-Rome</model> <vendor>AMD</vendor> <feature policy='require' name='pcid'/> <feature policy='require' name='x2apic'/> <feature policy='require' name='tsc-deadline'/> <feature policy='require' name='hypervisor'/> <feature policy='require' name='tsc_adjust'/> <feature policy='require' name='erms'/> <feature policy='require' name='vaes'/> <feature policy='require' name='vpclmulqdq'/> <feature policy='require' name='spec-ctrl'/> <feature policy='require' name='stibp'/> <feature policy='require' name='arch-capabilities'/> <feature policy='require' name='ssbd'/> <feature policy='require' name='xsaves'/> <feature policy='require' name='cmp_legacy'/> <feature policy='require' name='amd-ssbd'/> <feature policy='require' name='virt-ssbd'/> <feature policy='require' name='rdctl-no'/> <feature policy='require' name='skip-l1dfl-vmentry'/> <feature policy='require' name='mds-no'/> <feature policy='require' name='pschange-mc-no'/> <feature policy='require' name='topoext'/> </cpu> No problem due to the new type being around. Migration forward and back worked fine. Obviously new types can't be migrated back, but that never was required. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1921880 Title: Add EPYC-Milan model To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1921880/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs