pbot/doc/VirtualMachine.md

Virtual Machine

PBot can interact with a virtual machine to safely execute arbitrary user-submitted system commands and code.

Installation methods

libvirt and QEMU (recommended)

This document will guide you through installing and configuring a Linux virtual machine on a Linux host by using the widely available libvirt project tools, such as virt-install, virsh, and virt-viewer.

Additionally, if you’d prefer not to use libvirt, this guide will also demonstrate equivalent Linux system commands and QEMU commands.

Vagrant (experimental)

A much simpler and easier method to install the virtual machine is to use the Vagrant virtual machine management and provisioning framework. Under the pbot-vm/vagrant/ directory I have created a few Vagrantfile VM configuration and provisioning scripts.

These scripts are currently highly experimental and some pbot-vm features are not yet fully implemented, such as snapshotting and disabling the network. However, if you want to quickly test out the PBot virtual machine with just a couple of simple easy commands, read the PBot Vagrant guide instead.

Host vs guest

• host: your physical Linux system hosting the virtual machine
• guest: the Linux system installed inside the virtual machine

The commands below will be prefixed with host$ or guest$ to reflect where the command should be executed.

Environment variables

Many commands can be configured with environment variables. If a variable is not defined, a sensible default value will be used.

Environment variable	Default value	Description
PBOTVM_DOMAIN	pbot-vm	The libvirt domain identifier
PBOTVM_ADDR	127.0.0.1	vm-server address for incoming vm-client commands
PBOTVM_PORT	9000	vm-server port for incoming vm-client commands
PBOTVM_SERIAL	5555	TCP port for serial communication
PBOTVM_HEART	5556	TCP port for serial heartbeats
PBOTVM_CID	7	Context ID for VM socket (if using VSOCK)
PBOTVM_VPORT	5555	VM socket service port (if using VSOCK)
PBOTVM_TIMEOUT	10	Duration before command times out (in seconds)
PBOTVM_NOREVERT	not set	If set then the VM will not revert to previous snapshot

Initial virtual machine set-up

These steps need to be done only once during the first-time set-up.

Prerequisites

For full hardware-supported virtualization at near native system speeds, we need to ensure your system has enabled CPU Virtualization Technology and that KVM is set up and loaded.

CPU Virtualization Technology

Ensure CPU Virtualization Technology is enabled in your motherboard BIOS.

host$ egrep '(vmx|svm)' /proc/cpuinfo

If you see your CPUs listed with vmx or svm flags, you’re good to go. Otherwise, consult your motherboard manual to see how to enable VT.

KVM

Ensure KVM is set up and loaded.

host$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used

If you see the above, everything’s set up. Otherwise, consult your operating system manual or KVM manual to install and load KVM.

If you do not have the kvm-ok command, you can ls /dev/kvm to ensure the KVM device exists.

libvirt and QEMU

If using libvirt, ensure it is installed and ready.

host$ virsh version --daemon
Compiled against library: libvirt 7.6.0
Using library: libvirt 7.6.0
Using API: QEMU 7.6.0
Running hypervisor: QEMU 6.0.0
Running against daemon: 7.6.0

Just QEMU (assuming x86_64):

host$ qemu-system-x86_64 --version
QEMU emulator version 6.0.0
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

If there’s anything missing, please consult your operating system manual to install the libvirt and/or QEMU packages.

On Ubuntu: sudo apt install qemu-kvm libvirt-daemon-system

On OpenSUSE Tumbleweed: sudo zypper in libvirt virt-install virt-viewer

Make a pbot-vm user or directory

You can either make a new user account or make a new directory in your current user account. In either case, name it pbot-vm so we’ll have a home for the virtual machine.

Add libvirt group to your user

Add your user (or the pbot-vm user) to the libvirt group.

host$ sudo adduser $USER libvirt

or

host$ sudo usermod -aG libvirt $USER

Log out and then log back in for the new group to take effect. Or use the newgrp command.

Download Linux ISO

Download a preferred Linux ISO. For this guide, we’ll provide instructions for Fedora and OpenSUSE Tumbleweed. Why? I was initially using Fedora Rawhide for my PBot VM because I wanted convenient and reliable access to the latest bleeding-edge versions of software. I’ve since switched to OpenSUSE Tumbleweed for easy access to packages that are even more bleeding-edge than Fedora Rawhide.

If you are more comfortable in another Linux distribution then feel free to choose that instead. Make sure you choose the minimal install option without a graphical desktop.

The ISOs used in this guide are (you may instead prefer to navigate to the websites to download a more current image):

https://download.fedoraproject.org/pub/fedora/linux/releases/35/Server/x86_64/iso/Fedora-Server-netinst-x86_64-35-1.2.iso

or

https://download.opensuse.org/tumbleweed/iso/openSUSE-Tumbleweed-NET-x86_64-Snapshot20240321-Media.iso

I recommend using OpenSUSE Tumbleweed since that’s what I’ve tested on most recently.

Create a new virtual machine

To create a new virtual machines, this guide offers two options. The first is libvirt’s virt-install command. It greatly simplifies configuration by automatically creating networking bridges and setting up virtio devices. The second option is manually using Linux system commands to configure network bridges and execute QEMU with the correct options.

libvirt

To create a new virtual machine we’ll use the virt-install command. This command takes care of setting up virtual networking bridges and virtual hardware for us. If you prefer to manually set things up and use QEMU directly, skip past the virt-install section.

• First, ensure you are the pbot-vm user or that you have changed your current working directory to pbot-vm. The Linux ISO downloaded earlier should be present in this location.

Execute the following command:

Fedora (using Spice graphical display):

host$ virt-install --name=pbot-vm --disk=size=12,path=vm.qcow2 --cpu=host --os-variant=fedora34 --graphics=spice --video=virtio --location=Fedora-Server-netinst-x86_64-35-1.2.iso

OpenSUSE Tumbleweed (using PTY serial console):

host$ virt-install --name=pbot-vm --disk=size=12,path=vm.qcow2 --cpu=host --os-variant=opensusetumbleweed --graphics=none --console=pty,target.type=virtio --serial=pty --extra-args=console=ttyS0,115200n8 --video=virtio --location=openSUSE-Tumbleweed-NET-x86_64-Snapshot20240321-Media.iso

You may use virt-install --os-variant list to list the available --os-variant options present on your machine.

Note that disk=size=12 will create a 12 GB sparse file. Sparse means the file won’t actually take up 12 GB. It will start at 0 bytes and grow as needed. You can use the du command to verify this. After a minimal Fedora install, the size will be approximately 1.7 GB. It will grow to about 2.5 GB with all PBot features installed.

For further information about virt-install, read its manual page. While the above command should give sufficient performance and compatability, there are a great many options worth investigating if you want to fine-tune your virtual machine.

To list virtual machines and their state use virsh list --all.

If you need to ungracefully shutdown the virtual machine use virsh destroy pbot-vm.

If you need to delete the virtual machine and its storage volume use: virsh undefine pbot-vm --storage vda --snapshots-metadata.

QEMU

If you prefer not to use libvirt, we may need to manually create the network bridge. Use the ip link command to list network interfaces:

host$ sudo ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 74:86:7a:4e:a1:95 brd ff:ff:ff:ff:ff:ff
    altname enp1s0
3: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 52:54:00:83:3f:59 brd ff:ff:ff:ff:ff:ff
    inet 192.168.123.1/24 brd 192.168.123.255 scope global virbr0
       valid_lft forever preferred_lft forever

Create a new bridged named pbot-br0:

host$ ip link add name pbot-br0 type bridge
host$ ip link set pbot-br0 up

Add your network interface to the bridge:

host$ ip link set eth0 master pbot-br0

Give the bridge an IP address (use an appropriate address for your network):

host$ ip addr add dev pbot-br0 192.168.50.2/24

We will use the qemu-bridge-helper program from the qemu-common package to create the TAP interface for us when we start the virtual machine and to remove the interface when the virtual machine is shut-down. To set the program up, we need to create its access control list file:

host$ sudo mkdir /etc/qemu
host$ sudo chmod 755 /etc/qemu
host$ sudo echo allow pbot-br0 >> /etc/qemu/bridge.conf
host$ sudo chmod 640 /etc/qemu/bridge.conf

To allow unprivileged users to create VMs using the network bridge, we must set the SUID bit on the qemu-bridge-helper program:

host$ chmod u+s /usr/lib/qemu/qemu-bridge-helper

With the bridge configured, we move on to creating a sparse disk image for the virtual machine:

host$ qemu-img create -f qcow2 pbot-vm.qcow2 12G

Then we can start QEMU (assuming x86_64) and tell it to boot the installer ISO:

Fedora:

host$ qemu-system-x86_64 -enable-kvm -cpu host -mem 1024 -hda pbot-vm.qcow2 -cdrom Fedora-Server-netinst-x86_64-35-1.2.iso -boot d -nic bridge,br=pbot-br0 -usb -device usb-tablet

OpenSUSE Tumbleweed:

host$ qemu-system-x86_64 -enable-kvm -cpu host -mem 1024 -hda pbot-vm.qcow2 -cdrom openSUSE-Tumbleweed-NET-x86_64-Snapshot20240321-Media.iso -boot d -nic bridge,br=pbot-br0 -usb -device usb-tablet

This command is the bare minimum for performant virtualization with networking. See the QEMU documentation for interesting options to tweak your virtual machine.

Install Linux in the virtual machine

After executing the virt-install or qemu command above, you should now see Linux booting up and launching an installer. For this guide, we’ll walk through the Fedora 35 and the OpenSUSE Tumbleweed installers. You can adapt these steps for your own distribution of choice.

Fedora:

• Click Partition disks. Don’t change anything. Click Done.
• Click Root account. Click Enable root account. Set a password. Click Done.
• Click User creation. Create a new user. Skip Fullname and set Username to vm. Untick Add to wheel or Set as administrator. Untick Require password. Click Done.
• Wait until Software selection is done processing and is no longer greyed out. Click it. Change install from Server to Minimal. Click Done.
• Click Begin installation.

Installation will download about 328 RPMs consisting of about 425 MB. The vm.qcow2 file should be about 2 GB after installation completes. You can close the Spice window. To reattach use virt-viewer pbot-vm.

Tumbleweed:

• Follow on-screen instructions and TAB to Next until you reach the System Role screen.
• Ensure you select the Server role to install a small set of packages suitable for servers with a text mode interface.
• On Suggested Partitioning TAB to Guided Setup.
• Select Next until you reach Filesystem Options.
• TAB to Btrfs and press SPACE and then arrow-keys to change this to Ext4 to improve random-access IO performance and reduce writes. Then TAB to Next and continue.
• Continue following on-screen instructions until you reach the Local User screen.
• Enter vm for Username and set a password. Then TAB to Next and continue.
• At the Installation Settings tab to Change and select Security. Untick Enable Firewall to make things easier. Then TAB to Next and continue.
• Verify installation settings and then TAB to Install and begin the installation.

Installation will download about 800 packages consisting of about 1.7 GiB. The vm.qcow2 file should be about 2.4 GB after installation completes.

The VM will automatically reboot into a shell after installation. You can press ^] to detach from the VM’s serial PTY console. To reattach use virsh console pbot-vm.

Set up serial ports

While the installation is in progress, switch to a terminal on your host system.

libvirt

Go into the applets/pbot-vm/host/devices directory and run the add-serials script to add the serial-2.xml and serial-3.xml files to the configuration for the pbot-vm libvirt machine.

host$ ./add-serials

This will enable the /dev/ttyS2 and /dev/ttyS3 serial ports in the guest and connect them to the following TCP addresses on the host: 127.0.0.1:5555 and 127.0.0.1:5556, respectively. ttyS2/5555 is the data channel used to send commands or code to the virtual machine and to read back output. ttyS3/5556 is simply a newline sent every 5 seconds, representing a heartbeat, used to ensure that the PBot communication channel is healthy.

You may use the PBOTVM_DOMAIN, PBOTVM_SERIAL and PBOTVM_HEART environment variables to override the default values. To use ports 7777 and 7778 instead:

host$ PBOTVM_SERIAL=7777 PBOTVM_HEART=7778 ./add-serials

If you later want to change the serial ports or the TCP ports, execute the command virsh edit pbot-vm on the host. This will open the pbot-vm XML configuration in your default system editor. Find the <serial> tags and edit their attributes.

QEMU

Add the following options to your qemu command-line arguments:

-chardev socket,id=charserial1,host=127.0.0.1,port=5555,server=on,wait=off
-device {"driver":"isa-serial","chardev":"charserial1","id":"serial1","index":2}
-chardev socket,id=charserial2,host=127.0.0.1,port=5556,server=on,wait=off
-device {"driver":"isa-serial","chardev":"charserial2","id":"serial2","index":3}

If necessary, replace 5555 and 5556 with your preferred PBOTVM_SERIAL and PBOTVM_HEART values.

Set up virtio-vsock

VM sockets (AF_VSOCK) are a Linux-specific feature (at the time of this writing). They are the preferred way for PBot to communicate with the PBot VM Guest server. Serial communication has several limitations. See https://vmsplice.net/~stefan/stefanha-kvm-forum-2015.pdf for an excellent overview.

To use VM sockets with QEMU and virtio-vsock, you need:

• a Linux hypervisor with kernel 4.8+
• a Linux virtual machine on that hypervisor with kernel 4.8+
• QEMU 2.8+ on the hypervisor, running the virtual machine
• socat version 1.7.4+

If you do not meet these requirements, the PBot VM will fallback to using serial communication. You may explicitly disable VM sockets by setting PBOTVM_CID=0. You can skip reading the rest of this section.

If you do want to use VM sockets, read on.

First, ensure the vhost_vsock Linux kernel module is loaded on the host:

host$ lsmod | grep vsock
vhost_vsock            24576  1
vsock                  45056  2 vmw_vsock_virtio_transport_common,vhost_vsock
vhost                  53248  2 vhost_vsock,vhost_net

If the module is not loaded, load it with:

host$ sudo modprobe vhost_vsock

Once the module is loaded, you should have the following character devices:

host$ ls -l /dev/vhost-vsock
crw------- 1 root root 10, 53 May  4 11:55 /dev/vhost-vsock
host$ ls -l /dev/vsock
crw-rw-rw- 1 root root 10, 54 May  4 11:55 /dev/vsock

A VM sockets address is comprised of a context ID (CID) and a port; just like an IP address and TCP/UDP port. The CID is represented using an unsigned 32-bit integer. It identifies a given machine as either a hypervisor or a virtual machine. Several addresses are reserved, including 0, 1, and the maximum value for a 32-bit integer: 0xffffffff. The hypervisor is always assigned a CID of 2, and VMs can be assigned any CID between 3 and 0xffffffff - 1.

We must attach a vhost-vsock-pci device to the guest to enable VM sockets communication. Each VM on a hypervisor must have a unique context ID (CID). Each service within the VM must have a unique port. The PBot VM Guest defaults to 7 for the CID and 5555 for the port.

libvirt

While still in the applets/pbot-vm/host/devices directory, run the add-vsock script:

host$ ./add-vsock

or to configure a different CID:

host$ PBOTVM_CID=42 ./add-vsock

In the VM guest (once it reboots), there should be a /dev/vsock device:

guest$ ls -l /dev/vsock
crw-rw-rw- 1 root root 10, 55 May  4 13:21 /dev/vsock

QEMU

Add the following option to your qemu command-line arguments.

-device {"driver":"vhost-vsock-pci","id":"vsock0","guest-cid":7,"vhostfd":"28","bus":"pci.7","addr":"0x0"}

See full QEMU command-line arguments here.

In the VM guest (once it reboots), there should be a /dev/vsock device:

guest$ ls -l /dev/vsock
crw-rw-rw- 1 root root 10, 55 May  4 13:21 /dev/vsock

Reboot virtual machine

• First ensure you set-up serial/vsock as described above! We are rebooting to ensure the new devices are loaded.

Fedora:

Once the Fedora installation completes inside the virtual machine, click the Reboot button in the installer window. Login as root when the virtual machine boots back up.

Tumbleweed:

The Tumbleweed installer will automatically reboot to a shell after the installation. Login as root and run shutdown now -h. Then run virsh start pbot-vm. (Using shutdown now -r to reboot will not initialize the new serial/vsock devices.) Login as root when the virtual machine boots back up.

Install software

Now we can install any software and programming languages we want to make available in the virtual machine. Use the dnf search or zypper se command or your distribution’s documentation to find packages. I will soon make available a script to install all package necessary for all languages supported by PBot.

To make use of VM sockets, install the socat package:

Fedora:

guest$ dnf install socat

OpenSUSE Tumbleweed:

guest$ zypper in socat

For the C programming language you will need at least these:

Fedora:

guest$ dnf install libubsan libasan gdb gcc clang

OpenSUSE Tumbleweed:

guest$ zypper in libubsan1 libasan8 gdb gcc clang

Install packages for other languages as desired.

Install Perl

Now we need to install Perl on the guest. This allows us to run the PBot VM Guest server script.

Fedora:

guest$ dnf install perl-interpreter perl-lib perl-IPC-Run perl-JSON-XS perl-English perl-IPC-Shareable

OpenSUSE Tumbleweed:

guest$ zypper in perl-IPC-Run perl-JSON-XS make gcc
guest$ cpan i IPC::Shareable

This installs the minium packages for the Perl interpreter (note we used perl-interpreter instead of perl), as well as a few Perl modules.

Install PBot VM Guest

Next we install the PBot VM Guest server script that fosters communication between the virtual machine guest and the physical host system. We’ll do this inside the virtual machine guest system, logged on as root while in the /tmp directory.

guest$ cd /tmp

The rsync command isn’t installed with a Fedora minimal install, but scp is available. Replace 192.168.100.42 below with your own local IP address; user with the user account that has the PBot directory; and pbot with the path to the directory.

guest$ scp -r user@192.168.100.42:~/pbot/applets/pbot-vm/guest .

Once that’s done, run the following command:

guest$ ./guest/bin/setup-guest

This will install guest-server to /usr/local/bin/, set up some environment variables and harden the guest system. Additionally, it’ll autodetect your chosen OS/distribution and attempt to run any provisioning scripts from the ./guest/provision directory. If no provisioning scripts are available, it will warn you to manually install the packages for the cc languages you want to use. You may use ./guest/provision/tumbleweed as a reference.

After running the setup-guest script, we need to make the environment changes take effect:

guest$ source /root/.bashrc

We no longer need the /tmp/guest/ stuff. We can delete it:

guest$ rm -rf guest/

Start PBot VM Guest

We’re ready to start the PBot VM Guest server. On the guest, as root, execute the command:

guest$ guest-server

This starts up a server to listen for incoming commands or code and to handle them. We’ll leave this running.

Test PBot VM Guest

Let’s make sure everything’s working up to this point. On the host, there should be two open TCP ports on 5555 and 5556. On the host, execute the command:

host$ nc -zv 127.0.0.1 5555-5556

If it says anything other than Connection succeeded then make sure you have completed the steps under Set up serial ports and that your network configuration is allowing access.

Let’s make sure the PBot VM Guest server is listening for and can execute commands. The vm-exec command allows you to send commands from the shell. Change your current working directory to applets/pbot-vm/host/bin and run the vm-exec command:

host$ cd applets/pbot-vm/host/bin
host$ ./vm-exec -lang=sh echo hello world

This should output some logging noise followed by “hello world”. You can test other language modules by changing the -lang= option. I recommend testing and verifying that all of your desired language modules are configured before going on to the next step.

If you have multiple PBot VM Guests, or if you used a different TCP port, you can specify the PBOTVM_SERIAL environment variable when executing the vm-exec command:

host$ PBOTVM_SERIAL=7777 ./vm-exec -lang=sh echo test

Save initial state

Switch back to an available terminal on the physical host machine. Enter the following command to save a snapshot of the virtual machine waiting for incoming commands.

• Before doing this step, ensure all commands are cached by executing them at least once. For example, the gcc and gdb commands take a long time to load into memory. The initial execution may take a several long seconds to complete. Once completed, the command will be cached. Future invocations will execute significantly quicker.

host$ virsh snapshot-create-as pbot-vm 1

If the virtual machine ever times-out or its heartbeat stops responding, PBot will revert the virtual machine to this saved snapshot.

Install host packages

Ensure the following packages are installed on the host machine:

• fortune – used to generate STDIN input when no -stdin flag is provided to the bot’s cc command
• astyle – used to pretty-format C-family languages

Initial virtual machine set-up complete

This concludes the initial one-time set-up. You can close the virt-viewer window or press ^] to detach from the VM’s serial PTY console. The virtual machine will continue running in the background until it is manually shutdown (via shutdown now -h inside the VM or via virsh shutdown pbot-vm on the host).

Start PBot VM Host

To start the PBot VM Host server, change your current working directory to applets/pbot-vm/host/bin and execute the vm-server script:

host$ cd applets/pbot-vm/host/bin
host$ ./vm-server

This will start a TCP server on port 9000. It will listen for incoming commands and pass them along to the virtual machine’s TCP serial port 5555. It will also monitor the heartbeat port 5556 to ensure the PBot VM Guest server is alive.

You may override any of the defaults by setting environment variables. For example, to use other-vm with a longer 30 second timeout, on different serial and heartbeat ports:

host$ PBOTVM_DOMAIN="other-vm" PBOTVM_SERVER=9001 PBOTVM_SERIAL=7777 PBOTVM_HEART=7778 PBOTVM_TIMEOUT=30 ./vm-server

Test PBot

All done. Everything is set up now.

PBot is already preconfigured with commands that invoke the host/bin/vm-client script to send VM commands to vm-server on the default port 9000:

 <pragma-> factshow sh
    <PBot> [global] sh: /call cc -lang=sh
 <pragma-> factshow cc
    <PBot> [global] cc: /call vm-client {"nick":"$nick:json","channel":"$channel:json","code":"$args:json"}
 <pragma-> factshow vm-client
    <PBot> [global] vm-client: pbot-vm/host/bin/vm-client [applet]

In your instance of PBot, the sh echo hello command should output hello.

<pragma-> sh echo hello
   <PBot> hello

QEMU command from libvirt

This is the QEMU command-line arguments used by libvirt. Extract flags as needed, e.g. -chardev.

/usr/bin/qemu-system-x86_64 -name guest=pbot-vm,debug-threads=on -S -object {"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-2-pbot-vm/master-key.aes"} -machine pc-q35-6.2,usb=off,vmport=off,dump-guest-core=off,memory-backend=pc.ram -accel kvm -cpu IvyBridge-IBRS,ss=on,vmx=on,pdcm=on,pcid=on,hypervisor=on,arat=on,tsc-adjust=on,umip=on,md-clear=on,stibp=on,arch-capabilities=on,ssbd=on,xsaveopt=on,ibpb=on,ibrs=on,amd-stibp=on,amd-ssbd=on,skip-l1dfl-vmentry=on,pschange-mc-no=on,aes=off,rdrand=off -m 2048 -object {"qom-type":"memory-backend-ram","id":"pc.ram","size":2147483648} -overcommit mem-lock=off -smp 2,sockets=2,cores=1,threads=1 -uuid ec9eebba-8ba1-4de3-8ec0-caa6fd808ad4 -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=38,server=on,wait=off -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device {"driver":"pcie-root-port","port":16,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x2"} -device {"driver":"pcie-root-port","port":17,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x2.0x1"} -device {"driver":"pcie-root-port","port":18,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x2.0x2"} -device {"driver":"pcie-root-port","port":19,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x2.0x3"} -device {"driver":"pcie-root-port","port":20,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x2.0x4"} -device {"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"} -device {"driver":"pcie-root-port","port":22,"chassis":7,"id":"pci.7","bus":"pcie.0","addr":"0x2.0x6"} -device {"driver":"pcie-root-port","port":23,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x2.0x7"} -device {"driver":"pcie-root-port","port":24,"chassis":9,"id":"pci.9","bus":"pcie.0","multifunction":true,"addr":"0x3"} -device {"driver":"pcie-root-port","port":25,"chassis":10,"id":"pci.10","bus":"pcie.0","addr":"0x3.0x1"} -device {"driver":"pcie-root-port","port":26,"chassis":11,"id":"pci.11","bus":"pcie.0","addr":"0x3.0x2"} -device {"driver":"pcie-root-port","port":27,"chassis":12,"id":"pci.12","bus":"pcie.0","addr":"0x3.0x3"} -device {"driver":"pcie-root-port","port":28,"chassis":13,"id":"pci.13","bus":"pcie.0","addr":"0x3.0x4"} -device {"driver":"pcie-root-port","port":29,"chassis":14,"id":"pci.14","bus":"pcie.0","addr":"0x3.0x5"} -device {"driver":"qemu-xhci","p2":15,"p3":15,"id":"usb","bus":"pci.2","addr":"0x0"} -device {"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.3","addr":"0x0"} -blockdev {"driver":"file","filename":"/home/pbot/pbot-vms/openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null} -device {"driver":"virtio-blk-pci","bus":"pci.4","addr":"0x0","drive":"libvirt-1-format","id":"virtio-disk0","bootindex":1} -netdev {"type":"tap","fd":"39","vhost":true,"vhostfd":"41","id":"hostnet0"} -device {"driver":"virtio-net-pci","netdev":"hostnet0","id":"net0","mac":"52:54:00:03:16:5a","bus":"pci.1","addr":"0x0"} -chardev pty,id=charserial0 -device {"driver":"isa-serial","chardev":"charserial0","id":"serial0","index":0} -chardev socket,id=charserial1,host=127.0.0.1,port=5555,server=on,wait=off -device {"driver":"isa-serial","chardev":"charserial1","id":"serial1","index":2} -chardev socket,id=charserial2,host=127.0.0.1,port=5556,server=on,wait=off -device {"driver":"isa-serial","chardev":"charserial2","id":"serial2","index":3} -chardev socket,id=charchannel0,fd=37,server=on,wait=off -device {"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"org.qemu.guest_agent.0"} -chardev spicevmc,id=charchannel1,name=vdagent -device {"driver":"virtserialport","bus":"virtio-serial0.0","nr":2,"chardev":"charchannel1","id":"channel1","name":"com.redhat.spice.0"} -device {"driver":"usb-tablet","id":"input0","bus":"usb.0","port":"1"} -audiodev {"id":"audio1","driver":"spice"} -spice port=5901,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on -device {"driver":"virtio-vga","id":"video0","max_outputs":1,"bus":"pcie.0","addr":"0x1"} -device {"driver":"ich9-intel-hda","id":"sound0","bus":"pcie.0","addr":"0x1b"} -device {"driver":"hda-duplex","id":"sound0-codec0","bus":"sound0.0","cad":0,"audiodev":"audio1"} -chardev spicevmc,id=charredir0,name=usbredir -device {"driver":"usb-redir","chardev":"charredir0","id":"redir0","bus":"usb.0","port":"2"} -chardev spicevmc,id=charredir1,name=usbredir -device {"driver":"usb-redir","chardev":"charredir1","id":"redir1","bus":"usb.0","port":"3"} -device {"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.5","addr":"0x0"} -object {"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"} -device {"driver":"virtio-rng-pci","rng":"objrng0","id":"rng0","bus":"pci.6","addr":"0x0"} -loadvm 1 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -device {"driver":"vhost-vsock-pci","id":"vsock0","guest-cid":7,"vhostfd":"28","bus":"pci.7","addr":"0x0"} -msg timestamp=on