part 2:https://www.sifive.com/blog/2018/04/25/risc-v-qemu-part-2-the-risc-v-qemu-port-is-up stream/
part 1: https://www.sifive.com/blog/2017/12/20/risc-v-qemu-part-1-privileged-isa-hifive1-virtio/
see-also Sifive’s statement on Spectre/Meltdown:
https://www.sifive.com/blog/2018/01/05/sifive-statement-on-meltdown-and-spectre/