SMI trigger causes hang with multiple cores

When using qemu , SMI trigger causes hand/reboot under following conditions:

1. No KVM but there are more than 1 threads (-smp > 1)
2. When using KVM.

Info:
qemu-system-x86_64 --version
QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.29)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

SMI trigger was done by writing 0x00 in IO port 0xB2.