I have had success using the following settings in the arg line, with workstation 15 and proxmox 6.2-4. I haven't tested performance yet
-cpu host,+kvm_pv_unhalt,+kvm_pv_eoi,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_reset,hv_vpindex,hv_runtime,hv_relaxed,hv_synic,hv_stimer,-hypervisor
Full conf...