Has anyone tried cpu(die) pinning for VM, AMD relevant patch was included in upstream in August (QEMU-3.0.0 -machine must be pc-q35-3.0)?
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897054
https://www.reddit.com/r/VFIO/comments/9iaj7x/smt_not_supported_by_qemu_on_amd_ryzen_cpu/