ref: 66b6185845e85258f1408271d5f705aacfa6ffdb
parent: 753a35b52ac098985aff5e22a069d30d16903385
author: Sigrid <ftrvxmtrx@gmail.com>
date: Sun Dec 6 13:48:32 EST 2020
amd64, vmx: support avx/avx2 for host/guest; use *noavx= in plan9.ini to disable