ovmf + smp + hyper-v + windows 7: doesn't work

- using ovmf
- enable smp (>1 processors/cores)
- enable hyper-v features (eg. -cpu Haswell,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff)
- try to boot or install windows 7 x64

Result: black screen and hangs