Comment 4 for bug 994378

when L1 guest kernel: 3.16.0(kvm.git+ qemu.git: c77dcacb..-69f87f71)
create L1 guest:
qemu-system-x86_64 -enable-kvm -m 6G -smp 4 -net nic,macaddr=00:12:31:45:56:13 -net tap,script=/etc/kvm/qemu-ifup ia32e_nested-kvm.img -cpu host
the L1 guest boot up fine