how do i make a bhyve guest pick up the bhyve CPU topology?

hello,

i have a VM host with a CPU:

CPU: Intel(R) Xeon(R) E E-2468 (2611.20-MHz K8-class CPU)

HTT is disabled in the BIOS, so this shows up on the host as
1 socket x 8 cores:

FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
FreeBSD/SMP: 1 package(s) x 8 core(s)

now i start a bhyve VM with '-c 2', but the VM does not pick up the
expected topology (2 sockets x 1 core x 1 thread), instead it decides
to enable HTT:

FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 hardware threads

if i force bhyve to set a particular topology, e.g. with
'-c 2,sockets=2,cores=1,threads=1' then the guest still does not pick up
the correct topology, but it does log some exciting new messages:

WARNING: L1 data cache covers fewer APIC IDs than a core (0 < 1)
WARNING: L2 data cache covers fewer APIC IDs than a core (0 < 1)
WARNING: L3 data cache covers fewer APIC IDs than a core (0 < 1)
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 hardware threads

this is using main ~29af6d2e2ec9fe8df7cf1e1a0bf3597028831b18 on amd64.

does anyone have an idea what's going on here or how i can fix it?