Enable KVM on default OS (Debian 9)

[manawyrm]

It works very well on the current Manjaro preview:

Code:

#!/bin/bash
export QEMU_AUDIO_DRV=pa

sudo qemu-system-aarch64 \
-cpu host \
-enable-kvm \
-M virt-2.12 \
-smp 2 \
-m 1.5G \
-bios QEMU_EFI.fd \
-device ramfb \
-device ich9-usb-ehci1 \
-device usb-kbd \
-device usb-mouse \
-device usb-tablet \
-device usb-storage,drive=drivers \
-drive if=none,id=drivers,media=cdrom,file=virtio-win-0.1.173.iso \
-device virtio-blk,drive=system \
-drive if=none,id=system,format=qcow2,file=system.qcow2 \
-soundhw hda \
-device usb-ehci,id=ehci -device usb-host,bus=ehci.0,vendorid=0x0bda,productid=0x8153

I used a USB network card (realtek gigabit), virtio-net and e1000 caused bluescreens. 
KVM only works on the 2 BIG cores, not the 4 little cores. Linux currently can't handle that automatically and the scheduler has problems with it as well. 
For now, I just disable the 4 little cores at runtime using the /sys/devices/system/cpu/cpu{0-3}/online flags. 


Windows image was a 19030.1, for arm64. 
x86 emulation works well, it's quite fast.