set up qemu_x86_64
===

1. Create qcow2
`$ qemu-img create -f qcow2 Image.img 10G`
2. Installing
`$ qemu-system-x86_64 -cpu host -accel kvm -m 4G -hda Image.img -cdrom CD.iso`
3. Run with window
`$ qemu-system-x86_64 -cpu host -accel kvm -m 4G -hda Image.img`
4. Run headless(after u set up ssh you can do so)
`$ qemu-system-x86_64 -cpu host -accel kvm -m 4G -hda Image.img -nic user,hostfwd=tcp:127.0.0.1:2222-:22 -nographic &`
5. connect with ssh
`$ ssh -p 2222 user@localhost`

:::info
[QEMU 網路設定 – 橋接與NAT](https://moon-half.info/p/4151)
:::

Set up qemu/kvm, virt-manager
===

# check virtualization is avaliable
$ lscpu
Virtualization features:
Virtualization:        VT-x

# check kvm is enable in kernl
$ zgrep CONFIG_KVM /proc/config.gz

# install needed packages
$ pacman -S archlinux-keyring
$ pacman -S qemu virt-manager virt-viewer dnsmasq vde2 bridge-utils openbsd-netcat dmidecode
$ pacman -S ebtables iptables
$ pacman -S libguestfs

# enable user account to use kvm
# uncomment following two lines
sudo vim /etc/libvirt/libvirtd.conf
unix_sock_group = "libvirt"
unix_sock_rw_perms = "0770"

# add account to libvert group
$ newgrp libvirt
$ sudo usermod -a -G libvirt $(whoami)

# start services
$ sudo systemctl enable libvirtd.service
$ sudo systemctl start libvirtd.service

# Virt logger (Optional)
$ sudo systemctl start virtlogd.service

# Enable Nested Virtualization (Optional)
### Intel Processor ###
sudo modprobe -r kvm_intel
sudo modprobe kvm_intel nested=1

### To make this configuration persistent,run:
echo "options kvm-intel nested=1" | sudo tee /etc/modprobe.d/kvm-intel.conf

### Confirm that Nested Virtualization is set to Yes:
### Intel Processor ###
$ systool -m kvm_intel -v | grep nested
    nested              = "Y"
    nested_early_check  = "N"
$ cat /sys/module/kvm_intel/parameters/nested 
Y

:::info
[libvert: qemu/kvm ](https://transang.me/install-kvm-on-arch-linux/)

[win7 GPU passthrough](https://www.youtube.com/watch?v=mnVbbD7G0Bo)

[qemu documentation](https://qemu-project.gitlab.io/qemu/system/invocation.html#hxtool-2)

[Manjaro/Arch Linux 如何安裝QEMU-KVM與Virt Manager虛擬機管理系統](https://www.youtube.com/watch?v=bbljnDcnbnA)

[Install KVM, QEMU and Virt Manager on Arch Linux / Manjaro](https://computingforgeeks.com/install-kvm-qemu-virt-manager-arch-manjar/)
:::
###### tags: `QEMU`