I am also seeing a regression. Insecure live VM migration of the VM-state (no local disk migration) is about 128MiB/s over my dedicated 40Gbps link.
2021-04-29 20:34:01 use dedicated network address for sending migration traffic (10.42.15.1)
2021-04-29 20:34:01 starting migration of VM 101 to...
I also hit this on my Threadripper 1950X with nested virt once I started a guest that has guests of its own
[120208.836360] WARNING: CPU: 14 PID: 101770 at arch/x86/kvm/mmu.c:2194 nonpaging_update_pte+0x15/0x19 [kvm]
[120208.836361] Modules linked in: tcp_diag inet_diag vfio_pci vfio_virqfd...
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