focal: qemu 1:4.2-3ubuntu6.15, libvirt 6.0.0-0ubuntu8.8 # qemu-system-x86_64 -cpu ? | grep EPYC x86 EPYC (alias configured by machine type) x86 EPYC-IBPB (alias of EPYC-v2) x86 EPYC-Rome (alias configured by machine type) x86 EPYC-Rome-v1 AMD EPYC-Rome Processor x86 EPYC-v1 AMD EPYC Processor x86 EPYC-v2 AMD EPYC Processor (with IBPB) x86 EPYC-v3 AMD EPYC Processor # virsh domcapabilities EPYC-Rome AMD After: # qemu-system-x86_64 -cpu ? | grep EPYC x86 EPYC (alias configured by machine type) x86 EPYC-IBPB (alias of EPYC-v2) x86 EPYC-Milan (alias configured by machine type) x86 EPYC-Milan-v1 AMD EPYC-Milan Processor x86 EPYC-Rome (alias configured by machine type) x86 EPYC-Rome-v1 AMD EPYC-Rome Processor x86 EPYC-Rome-v2 AMD EPYC-Rome Processor x86 EPYC-v1 AMD EPYC Processor x86 EPYC-v2 AMD EPYC Processor (with IBPB) x86 EPYC-v3 AMD EPYC Processor EPYC-Milan AMD Still working as expected