[device megasas] guest bsd panic at boot time in mfi_attach

[Lucas Leong]

when i boot freebsd guest with qemu + megasas device, guest OS got panic at boot time

panic: page fault
cpuid = 9
time = 1
KDB: stack backtrace:
#0 0xffffffff80c1d297 at kdb_backtrace+0x67
#1 0xffffffff80bd05cd at vpanic+0x19d
#2 0xffffffff80bd0423 at panic+0x43
#3 0xffffffff810a7d2c at trap_fatal+0x39c
#4 0xffffffff810a7d79 at trap_fatal+0x39c
#5 0xffffffff810a736f at trap+0x29f
#6 0xffffffff81081a0c at calltrap+0x8
#7 0xffffffff806c57f5 at mfi_attach+0x1195
#8 0xffffffff806cc830 at mfi_pci_attach+0x2f0
#9 0xffffffff80c0c121 at device_attach+0x3e1
#10 0xffffffff80c0d3ec at bus_generic_attach+0x5c
#11 0xffffffff80825ca5 at pci_attach+0xd5
#12 0xffffffff80c0c121 at device_attach+0x3e1
#13 0xffffffff80c0d3ec at bus_generic_attach+0x5c
#14 0xffffffff810b1120 at acpi_pcib_acpi_attach+0x440
#15 0xffffffff80c0c121 at device_attach+0x3e1
#16 0xffffffff80c0d3ec at bus_generic_attach+0x5c
#17 0xffffffff8047f141 at acpi_attach+0xd81
Uptime: 1s
Automatic reboot in 15 seconds - press a key on the console to abort

host environment:
ubuntu 18.04.3 LTS amd64 desktop

cli:

./qemu-6.2.0/build/qemu-system-x86_64 -cdrom FreeBSD-12.1-RELEASE-amd64-bootonly.iso -device megasas

after some debugging, guest OS didn't initialize properly from the device megasas and leads to page fault
is there any method to boot freebsd properly with megasas ?

i tried couples of combination arguments, but failed

Thanks