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[KVM] Add Desktop gpu-passthrouth config

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Florian RICHER 2022-01-21 21:24:38 +01:00
parent c5d8a8501f
commit 0034421f8b
11 changed files with 1357 additions and 0 deletions
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247
configs/kvm/confs/win10.xml Normal file
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<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">
<name>win10</name>
<uuid>b3d036ee-75ff-43fe-be76-b8c5494f5dd7</uuid>
<metadata>
<libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
<libosinfo:os id="http://microsoft.com/win/10"/>
</libosinfo:libosinfo>
</metadata>
<memory unit="KiB">25165824</memory>
<currentMemory unit="KiB">25165824</currentMemory>
<memoryBacking>
<hugepages/>
</memoryBacking>
<vcpu placement="static">32</vcpu>
<iothreads>1</iothreads>
<cputune>
<vcpupin vcpu="0" cpuset="0"/>
<vcpupin vcpu="1" cpuset="1"/>
<vcpupin vcpu="2" cpuset="2"/>
<vcpupin vcpu="3" cpuset="3"/>
<vcpupin vcpu="4" cpuset="4"/>
<vcpupin vcpu="5" cpuset="5"/>
<vcpupin vcpu="6" cpuset="6"/>
<vcpupin vcpu="7" cpuset="7"/>
<vcpupin vcpu="8" cpuset="8"/>
<vcpupin vcpu="9" cpuset="9"/>
<vcpupin vcpu="10" cpuset="10"/>
<vcpupin vcpu="11" cpuset="11"/>
<vcpupin vcpu="12" cpuset="12"/>
<vcpupin vcpu="13" cpuset="13"/>
<vcpupin vcpu="14" cpuset="14"/>
<vcpupin vcpu="15" cpuset="15"/>
<vcpupin vcpu="16" cpuset="16"/>
<vcpupin vcpu="17" cpuset="17"/>
<vcpupin vcpu="18" cpuset="18"/>
<vcpupin vcpu="19" cpuset="19"/>
<vcpupin vcpu="20" cpuset="20"/>
<vcpupin vcpu="21" cpuset="21"/>
<vcpupin vcpu="22" cpuset="22"/>
<vcpupin vcpu="23" cpuset="23"/>
<vcpupin vcpu="24" cpuset="24"/>
<vcpupin vcpu="25" cpuset="25"/>
<vcpupin vcpu="26" cpuset="26"/>
<vcpupin vcpu="27" cpuset="27"/>
<vcpupin vcpu="28" cpuset="28"/>
<vcpupin vcpu="29" cpuset="29"/>
<vcpupin vcpu="30" cpuset="30"/>
<vcpupin vcpu="31" cpuset="31"/>
<emulatorpin cpuset="32-63"/>
<iothreadpin iothread="1" cpuset="32-63"/>
</cputune>
<os>
<type arch="x86_64" machine="pc-q35-6.2">hvm</type>
<loader readonly="yes" type="pflash">/usr/share/edk2-ovmf/x64/OVMF_CODE.fd</loader>
<nvram>/var/lib/libvirt/qemu/nvram/win10_VARS.fd</nvram>
</os>
<features>
<acpi/>
<apic/>
<hyperv mode="custom">
<relaxed state="on"/>
<vapic state="on"/>
<spinlocks state="on" retries="8191"/>
<vendor_id state="on" value="buttplug"/>
</hyperv>
<kvm>
<hidden state="on"/>
</kvm>
<vmport state="off"/>
<ioapic driver="kvm"/>
</features>
<cpu mode="host-passthrough" check="none" migratable="on">
<topology sockets="1" dies="2" cores="8" threads="2"/>
<cache mode="passthrough"/>
<feature policy="require" name="topoext"/>
</cpu>
<clock offset="localtime">
<timer name="rtc" tickpolicy="catchup"/>
<timer name="pit" tickpolicy="delay"/>
<timer name="hpet" present="no"/>
<timer name="hypervclock" present="yes"/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled="no"/>
<suspend-to-disk enabled="no"/>
</pm>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type="file" device="disk">
<driver name="qemu" type="raw" cache="none" io="threads" discard="unmap" iothread="1" queues="32"/>
<source file="/home/florian/kvm/win10.img"/>
<target dev="vda" bus="virtio"/>
<boot order="1"/>
<address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
</disk>
<disk type="file" device="cdrom">
<driver name="qemu" type="raw"/>
<source file="/home/florian/T&#xE9;l&#xE9;chargements/Win10_21H2_French_x64.iso"/>
<target dev="sdb" bus="sata"/>
<readonly/>
<address type="drive" controller="0" bus="0" target="0" unit="1"/>
</disk>
<disk type="file" device="cdrom">
<driver name="qemu" type="raw"/>
<source file="/home/florian/T&#xE9;l&#xE9;chargements/virtio-win-0.1.215.iso"/>
<target dev="sdc" bus="sata"/>
<readonly/>
<address type="drive" controller="0" bus="0" target="0" unit="2"/>
</disk>
<controller type="usb" index="0" model="qemu-xhci" ports="15">
<address type="pci" domain="0x0000" bus="0x02" slot="0x00" function="0x0"/>
</controller>
<controller type="sata" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x1f" function="0x2"/>
</controller>
<controller type="pci" index="0" model="pcie-root"/>
<controller type="pci" index="1" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="1" port="0x10"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0" multifunction="on"/>
</controller>
<controller type="pci" index="2" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="2" port="0x11"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x1"/>
</controller>
<controller type="pci" index="3" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="3" port="0x12"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x2"/>
</controller>
<controller type="pci" index="4" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="4" port="0x13"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x3"/>
</controller>
<controller type="pci" index="5" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="5" port="0x14"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x4"/>
</controller>
<controller type="pci" index="6" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="6" port="0x15"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x5"/>
</controller>
<controller type="pci" index="7" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="7" port="0x16"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x6"/>
</controller>
<controller type="pci" index="8" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="8" port="0x17"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x7"/>
</controller>
<controller type="pci" index="9" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="9" port="0x18"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0" multifunction="on"/>
</controller>
<controller type="pci" index="10" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="10" port="0x19"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x1"/>
</controller>
<controller type="virtio-serial" index="0">
<address type="pci" domain="0x0000" bus="0x03" slot="0x00" function="0x0"/>
</controller>
<interface type="network">
<mac address="52:54:00:83:f9:1a"/>
<source network="default"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>
<input type="mouse" bus="ps2"/>
<input type="keyboard" bus="ps2"/>
<audio id="1" type="none"/>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x42" slot="0x00" function="0x0"/>
</source>
<rom file="/home/florian/kvm/patched-vbios.rom"/>
<address type="pci" domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x42" slot="0x00" function="0x1"/>
</source>
<address type="pci" domain="0x0000" bus="0x07" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x42" slot="0x00" function="0x2"/>
</source>
<address type="pci" domain="0x0000" bus="0x08" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x42" slot="0x00" function="0x3"/>
</source>
<address type="pci" domain="0x0000" bus="0x09" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="usb" managed="yes">
<source>
<vendor id="0x0b05"/>
<product id="0x193e"/>
</source>
<address type="usb" bus="0" port="4"/>
</hostdev>
<hostdev mode="subsystem" type="usb" managed="yes">
<source>
<vendor id="0xb58e"/>
<product id="0x9e84"/>
</source>
<address type="usb" bus="0" port="5"/>
</hostdev>
<hostdev mode="subsystem" type="usb" managed="yes">
<source>
<vendor id="0x8087"/>
<product id="0x0a2b"/>
</source>
<address type="usb" bus="0" port="6"/>
</hostdev>
<hostdev mode="subsystem" type="usb" managed="yes">
<source>
<vendor id="0x1b1c"/>
<product id="0x1b5a"/>
</source>
<address type="usb" bus="0" port="2"/>
</hostdev>
<memballoon model="virtio">
<address type="pci" domain="0x0000" bus="0x05" slot="0x00" function="0x0"/>
</memballoon>
</devices>
<qemu:commandline>
<qemu:arg value="-device"/>
<qemu:arg value="intel-hda"/>
<qemu:arg value="-rtc"/>
<qemu:arg value="base=localtime"/>
<qemu:arg value="-cpu"/>
<qemu:arg value="host,host-cache-info=on,kvm=off,l3-cache=on,kvm-hint-dedicated=on,migratable=no,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_vendor_id=buttplug,+invtsc,+topoext"/>
</qemu:commandline>
</domain>

9
configs/kvm/libvirt/hooks/kvm.conf Normal file
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# CONFIG
VM_MEMORY=24576
# VIRSH
VIRSH_GPU_VIDEO=pci_0000_42_00_0
VIRSH_GPU_AUDIO=pci_0000_42_00_1
VIRSH_USB=pci_0000_42_00_2
VIRSH_SERIAL_BUS=pci_0000_42_00_3

28
configs/kvm/libvirt/hooks/qemu Executable file
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#!/bin/bash
#
# Author: Sebastiaan Meijer (sebastiaan@passthroughpo.st)
#
GUEST_NAME="$1"
HOOK_NAME="$2"
STATE_NAME="$3"
MISC="${@:4}"
BASEDIR="$(dirname $0)"
HOOKPATH="$BASEDIR/qemu.d/$GUEST_NAME/$HOOK_NAME/$STATE_NAME"
set -e # If a script exits with an error, we should as well.
# check if it's a non-empty executable file
if [ -f "$HOOKPATH" ] && [ -s "$HOOKPATH"] && [ -x "$HOOKPATH" ]; then
eval \"$HOOKPATH\" "$@"
elif [ -d "$HOOKPATH" ]; then
while read file; do
# check for null string
if [ ! -z "$file" ]; then
eval \"$file\" "$@"
fi
done <<< "$(find -L "$HOOKPATH" -maxdepth 1 -type f -executable -print;)"
fi

29
configs/kvm/libvirt/hooks/qemu.d/win10/prepare/begin/alloc_hugepages.sh Executable file
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#!/bin/bash
## Load the config file
source "/etc/libvirt/hooks/kvm.conf"
## Calculate number of hugepages to allocate from memory (in MB)
HUGEPAGES="$(($VM_MEMORY/$(($(grep Hugepagesize /proc/meminfo | awk '{print $2}')/1024))))"
echo "Allocating hugepages..."
echo $HUGEPAGES > /proc/sys/vm/nr_hugepages
ALLOC_PAGES=$(cat /proc/sys/vm/nr_hugepages)
TRIES=0
while (( $ALLOC_PAGES != $HUGEPAGES && $TRIES < 1000 ))
do
echo 1 > /proc/sys/vm/compact_memory ## defrag ram
echo $HUGEPAGES > /proc/sys/vm/nr_hugepages
ALLOC_PAGES=$(cat /proc/sys/vm/nr_hugepages)
echo "Succesfully allocated $ALLOC_PAGES / $HUGEPAGES"
let TRIES+=1
done
if [ "$ALLOC_PAGES" -ne "$HUGEPAGES" ]
then
echo "Not able to allocate all hugepages. Reverting..."
echo 0 > /proc/sys/vm/nr_hugepages
exit 1
fi

7
configs/kvm/libvirt/hooks/qemu.d/win10/prepare/begin/cpu_mode_performance.sh Executable file
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#!/bin/bash
## Enable CPU governor performance mode
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
for file in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do echo "performance" > $file; done
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

35
configs/kvm/libvirt/hooks/qemu.d/win10/prepare/begin/start.sh Executable file
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#!/bin/bash
# Helpful to read output when debugging
set -x
# Load variables
source "/etc/libvirt/hooks/kvm.conf"
# Stop display manager
systemctl stop gdm.service
# Unbind VTconsoles
echo 0 > /sys/class/vtconsole/vtcon0/bind
echo 0 > /sys/class/vtconsole/vtcon1/bind
# Unbind EFI-Framebuffer
echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind
# Avoid a Race condition
sleep 5
# Unload all Nvidia drivers
modprobe -r nvidia_drm
modprobe -r nvidia_modeset
modprobe -r nvidia_uvm
modprobe -r nvidia
# Unbind the GPU from display driver
virsh nodedev-detach $VIRSH_GPU_VIDEO
virsh nodedev-detach $VIRSH_GPU_AUDIO
virsh nodedev-detach $VIRSH_USB
virsh nodedev-detach $VIRSH_SERIAL_BUS
# Load VFIO Kernel Module
modprobe vfio-pci

7
configs/kvm/libvirt/hooks/qemu.d/win10/release/end/cpu_mode_ondemand.sh Executable file
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#!/bin/bash
## Enable CPU governor on-demand mode
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
for file in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do echo "ondemand" > $file; done
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

4
configs/kvm/libvirt/hooks/qemu.d/win10/release/end/dealloc_hugepages.sh Executable file
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#!/bin/bash
echo 0 > /proc/sys/vm/nr_hugepages

36
configs/kvm/libvirt/hooks/qemu.d/win10/release/end/stop.sh Executable file
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#!/bin/bash
set -x
# Load variables
source "/etc/libvirt/hooks/kvm.conf"
# Unload VFIO-PCI Kernel Driver
modprobe -r vfio-pci
modprobe -r vfio_iommu_type1
modprobe -r vfio
# Re-Bind GPU to Nvidia Driver
virsh nodedev-reattach $VIRSH_GPU_VIDEO
virsh nodedev-reattach $VIRSH_GPU_AUDIO
virsh nodedev-reattach $VIRSH_USB
virsh nodedev-reattach $VIRSH_SERIAL_BUS
# Rebind VT consoles
echo 1 > /sys/class/vtconsole/vtcon0/bind
echo 1 > /sys/class/vtconsole/vtcon1/bind
# Bind EFI-Framebuffer
nvidia-xconfig --query-gpu-info > /dev/null 2>&1
echo "efi-framebuffer.0" > /sys/bus/platform/drivers/efi-framebuffer/bind
# Load all Nvidia drivers
modprobe nvidia_drm
modprobe nvidia_modeset
modprobe drm_kms_helper
modprobe drm
modprobe nvidia_uvm
modprobe nvidia
# Restart Display Manager
systemctl start gdm.service

955
configs/kvm/libvirt/qemu.conf Normal file
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# Master configuration file for the QEMU driver.
# All settings described here are optional - if omitted, sensible
# defaults are used.
# Use of TLS requires that x509 certificates be issued. The default is
# to keep them in /etc/pki/qemu. This directory must contain
#
# ca-cert.pem - the CA master certificate
# server-cert.pem - the server certificate signed with ca-cert.pem
# server-key.pem - the server private key
#
# and optionally may contain
#
# dh-params.pem - the DH params configuration file
#
# If the directory does not exist, libvirtd will fail to start. If the
# directory doesn't contain the necessary files, QEMU domains will fail
# to start if they are configured to use TLS.
#
# In order to overwrite the default path alter the following. This path
# definition will be used as the default path for other *_tls_x509_cert_dir
# configuration settings if their default path does not exist or is not
# specifically set.
#
#default_tls_x509_cert_dir = "/etc/pki/qemu"
# The default TLS configuration only uses certificates for the server
# allowing the client to verify the server's identity and establish
# an encrypted channel.
#
# It is possible to use x509 certificates for authentication too, by
# issuing an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client who does not have a
# certificate signed by the CA in /etc/pki/qemu/ca-cert.pem
#
# The default_tls_x509_cert_dir directory must also contain
#
# client-cert.pem - the client certificate signed with the ca-cert.pem
# client-key.pem - the client private key
#
# If this option is supplied it provides the default for the "_verify" option
# of specific TLS users such as vnc, backups, migration, etc. The specific
# users of TLS may override this by setting the specific "_verify" option.
#
# When not supplied the specific TLS users provide their own defaults.
#
#default_tls_x509_verify = 1
#
# Libvirt assumes the server-key.pem file is unencrypted by default.
# To use an encrypted server-key.pem file, the password to decrypt
# the PEM file is required. This can be provided by creating a secret
# object in libvirt and then to uncomment this setting to set the UUID
# of the secret.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#default_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
# VNC is configured to listen on 127.0.0.1 by default.
# To make it listen on all public interfaces, uncomment
# this next option.
#
# NB, strong recommendation to enable TLS + x509 certificate
# verification when allowing public access
#
#vnc_listen = "0.0.0.0"
# Enable this option to have VNC served over an automatically created
# unix socket. This prevents unprivileged access from users on the
# host machine, though most VNC clients do not support it.
#
# This will only be enabled for VNC configurations that have listen
# type=address but without any address specified. This setting takes
# preference over vnc_listen.
#
#vnc_auto_unix_socket = 1
# Enable use of TLS encryption on the VNC server. This requires
# a VNC client which supports the VeNCrypt protocol extension.
# Examples include vinagre, virt-viewer, virt-manager and vencrypt
# itself. UltraVNC, RealVNC, TightVNC do not support this
#
# It is necessary to setup CA and issue a server certificate
# before enabling this.
#
#vnc_tls = 1
# In order to override the default TLS certificate location for
# vnc certificates, supply a valid path to the certificate directory.
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but vnc_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
#vnc_tls_x509_cert_dir = "/etc/pki/libvirt-vnc"
# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
#vnc_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
# The default TLS configuration only uses certificates for the server
# allowing the client to verify the server's identity and establish
# an encrypted channel.
#
# It is possible to use x509 certificates for authentication too, by
# issuing an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client that does not have a
# certificate (as described in default_tls_x509_verify) signed by the
# CA in the vnc_tls_x509_cert_dir (or default_tls_x509_cert_dir).
#
# If this option is not supplied, it will be set to the value of
# "default_tls_x509_verify". If "default_tls_x509_verify" is not supplied either,
# the default is "0".
#
#vnc_tls_x509_verify = 1
# The default VNC password. Only 8 bytes are significant for
# VNC passwords. This parameter is only used if the per-domain
# XML config does not already provide a password. To allow
# access without passwords, leave this commented out. An empty
# string will still enable passwords, but be rejected by QEMU,
# effectively preventing any use of VNC. Obviously change this
# example here before you set this.
#
#vnc_password = "XYZ12345"
# Enable use of SASL encryption on the VNC server. This requires
# a VNC client which supports the SASL protocol extension.
# Examples include vinagre, virt-viewer and virt-manager
# itself. UltraVNC, RealVNC, TightVNC do not support this
#
# It is necessary to configure /etc/sasl2/qemu.conf to choose
# the desired SASL plugin (eg, GSSPI for Kerberos)
#
#vnc_sasl = 1
# The default SASL configuration file is located in /etc/sasl2/
# When running libvirtd unprivileged, it may be desirable to
# override the configs in this location. Set this parameter to
# point to the directory, and create a qemu.conf in that location
#
#vnc_sasl_dir = "/some/directory/sasl2"
# QEMU implements an extension for providing audio over a VNC connection,
# though if your VNC client does not support it, your only chance for getting
# sound output is through regular audio backends. By default, libvirt will
# disable all QEMU sound backends if using VNC, since they can cause
# permissions issues. Enabling this option will make libvirtd honor the
# QEMU_AUDIO_DRV environment variable when using VNC.
#
#vnc_allow_host_audio = 0
# SPICE is configured to listen on 127.0.0.1 by default.
# To make it listen on all public interfaces, uncomment
# this next option.
#
# NB, strong recommendation to enable TLS + x509 certificate
# verification when allowing public access
#
#spice_listen = "0.0.0.0"
# Enable use of TLS encryption on the SPICE server.
#
# It is necessary to setup CA and issue a server certificate
# before enabling this.
#
#spice_tls = 1
# In order to override the default TLS certificate location for
# spice certificates, supply a valid path to the certificate directory.
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but spice_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
#spice_tls_x509_cert_dir = "/etc/pki/libvirt-spice"
# Enable this option to have SPICE served over an automatically created
# unix socket. This prevents unprivileged access from users on the
# host machine.
#
# This will only be enabled for SPICE configurations that have listen
# type=address but without any address specified. This setting takes
# preference over spice_listen.
#
#spice_auto_unix_socket = 1
# The default SPICE password. This parameter is only used if the
# per-domain XML config does not already provide a password. To
# allow access without passwords, leave this commented out. An
# empty string will still enable passwords, but be rejected by
# QEMU, effectively preventing any use of SPICE. Obviously change
# this example here before you set this.
#
#spice_password = "XYZ12345"
# Enable use of SASL encryption on the SPICE server. This requires
# a SPICE client which supports the SASL protocol extension.
#
# It is necessary to configure /etc/sasl2/qemu.conf to choose
# the desired SASL plugin (eg, GSSPI for Kerberos)
#
#spice_sasl = 1
# The default SASL configuration file is located in /etc/sasl2/
# When running libvirtd unprivileged, it may be desirable to
# override the configs in this location. Set this parameter to
# point to the directory, and create a qemu.conf in that location
#
#spice_sasl_dir = "/some/directory/sasl2"
# Enable use of TLS encryption on the chardev TCP transports.
#
# It is necessary to setup CA and issue a server certificate
# before enabling this.
#
#chardev_tls = 1
# In order to override the default TLS certificate location for character
# device TCP certificates, supply a valid path to the certificate directory.
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but chardev_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
#chardev_tls_x509_cert_dir = "/etc/pki/libvirt-chardev"
# The default TLS configuration only uses certificates for the server
# allowing the client to verify the server's identity and establish
# an encrypted channel.
#
# It is possible to use x509 certificates for authentication too, by
# issuing an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client that does not have a
# certificate (as described in default_tls_x509_verify) signed by the
# CA in the chardev_tls_x509_cert_dir (or default_tls_x509_cert_dir).
#
# If this option is not supplied, it will be set to the value of
# "default_tls_x509_verify". If "default_tls_x509_verify" is not supplied either,
# the default is "1".
#
#chardev_tls_x509_verify = 1
# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#chardev_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
# Enable use of TLS encryption for all VxHS network block devices that
# don't specifically disable.
#
# When the VxHS network block device server is set up appropriately,
# x509 certificates are required for authentication between the clients
# (qemu processes) and the remote VxHS server.
#
# It is necessary to setup CA and issue the client certificate before
# enabling this.
#
#vxhs_tls = 1
# In order to override the default TLS certificate location for VxHS
# backed storage, supply a valid path to the certificate directory.
# This is used to authenticate the VxHS block device clients to the VxHS
# server.
#
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but vxhs_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
# VxHS block device clients expect the client certificate and key to be
# present in the certificate directory along with the CA master certificate.
# If using the default environment, default_tls_x509_verify must be configured.
# Since this is only a client the server-key.pem certificate is not needed.
# Thus a VxHS directory must contain the following:
#
# ca-cert.pem - the CA master certificate
# client-cert.pem - the client certificate signed with the ca-cert.pem
# client-key.pem - the client private key
#
#vxhs_tls_x509_cert_dir = "/etc/pki/libvirt-vxhs"
# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#vxhs_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
# Enable use of TLS encryption for all NBD disk devices that don't
# specifically disable it.
#
# When the NBD server is set up appropriately, x509 certificates are required
# for authentication between the client and the remote NBD server.
#
# It is necessary to setup CA and issue the client certificate before
# enabling this.
#
#nbd_tls = 1
# In order to override the default TLS certificate location for NBD
# backed storage, supply a valid path to the certificate directory.
# This is used to authenticate the NBD block device clients to the NBD
# server.
#
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but nbd_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
# NBD block device clients expect the client certificate and key to be
# present in the certificate directory along with the CA certificate.
# Since this is only a client the server-key.pem certificate is not needed.
# Thus a NBD directory must contain the following:
#
# ca-cert.pem - the CA master certificate
# client-cert.pem - the client certificate signed with the ca-cert.pem
# client-key.pem - the client private key
#
#nbd_tls_x509_cert_dir = "/etc/pki/libvirt-nbd"
# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#nbd_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
# In order to override the default TLS certificate location for migration
# certificates, supply a valid path to the certificate directory. If the
# provided path does not exist, libvirtd will fail to start. If the path is
# not provided, but TLS-encrypted migration is requested, then the
# default_tls_x509_cert_dir path will be used. Once/if a default certificate is
# enabled/defined, migration will then be able to use the certificate via
# migration API flags.
#
#migrate_tls_x509_cert_dir = "/etc/pki/libvirt-migrate"
# The default TLS configuration only uses certificates for the server
# allowing the client to verify the server's identity and establish
# an encrypted channel.
#
# It is possible to use x509 certificates for authentication too, by
# issuing an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client that does not have a
# certificate (as described in default_tls_x509_verify) signed by the
# CA in the migrate_tls_x509_cert_dir (or default_tls_x509_cert_dir).
#
# If this option is not supplied, it will be set to the value of
# "default_tls_x509_verify". If "default_tls_x509_verify" is not supplied
# either, the default is "1".
#
#migrate_tls_x509_verify = 1
# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#migrate_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
# By default TLS is requested using the VIR_MIGRATE_TLS flag, thus not requested
# automatically. Setting 'migate_tls_force' to "1" will prevent any migration
# which is not using VIR_MIGRATE_TLS to ensure higher level of security in
# deployments with TLS.
#
#migrate_tls_force = 0
# In order to override the default TLS certificate location for backup NBD
# server certificates, supply a valid path to the certificate directory. If the
# provided path does not exist, libvirtd will fail to start. If the path is
# not provided, but TLS-encrypted backup is requested, then the
# default_tls_x509_cert_dir path will be used.
#
#backup_tls_x509_cert_dir = "/etc/pki/libvirt-backup"
# The default TLS configuration only uses certificates for the server
# allowing the client to verify the server's identity and establish
# an encrypted channel.
#
# It is possible to use x509 certificates for authentication too, by
# issuing an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client that does not have a
# certificate (as described in default_tls_x509_verify) signed by the
# CA in the backup_tls_x509_cert_dir (or default_tls_x509_cert_dir).
#
# If this option is not supplied, it will be set to the value of
# "default_tls_x509_verify". If "default_tls_x509_verify" is not supplied either,
# the default is "1".
#
#backup_tls_x509_verify = 1
# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#backup_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
# By default, if no graphical front end is configured, libvirt will disable
# QEMU audio output since directly talking to alsa/pulseaudio may not work
# with various security settings. If you know what you're doing, enable
# the setting below and libvirt will passthrough the QEMU_AUDIO_DRV
# environment variable when using nographics.
#
#nographics_allow_host_audio = 1
# Override the port for creating both VNC and SPICE sessions (min).
# This defaults to 5900 and increases for consecutive sessions
# or when ports are occupied, until it hits the maximum.
#
# Minimum must be greater than or equal to 5900 as lower number would
# result into negative vnc display number.
#
# Maximum must be less than 65536, because higher numbers do not make
# sense as a port number.
#
#remote_display_port_min = 5900
#remote_display_port_max = 65535
# VNC WebSocket port policies, same rules apply as with remote display
# ports. VNC WebSockets use similar display <-> port mappings, with
# the exception being that ports start from 5700 instead of 5900.
#
#remote_websocket_port_min = 5700
#remote_websocket_port_max = 65535
# The default security driver is SELinux. If SELinux is disabled
# on the host, then the security driver will automatically disable
# itself. If you wish to disable QEMU SELinux security driver while
# leaving SELinux enabled for the host in general, then set this
# to 'none' instead. It's also possible to use more than one security
# driver at the same time, for this use a list of names separated by
# comma and delimited by square brackets. For example:
#
# security_driver = [ "selinux", "apparmor" ]
#
# Notes: The DAC security driver is always enabled; as a result, the
# value of security_driver cannot contain "dac". The value "none" is
# a special value; security_driver can be set to that value in
# isolation, but it cannot appear in a list of drivers.
#
#security_driver = "selinux"
# If set to non-zero, then the default security labeling
# will make guests confined. If set to zero, then guests
# will be unconfined by default. Defaults to 1.
#security_default_confined = 1
# If set to non-zero, then attempts to create unconfined
# guests will be blocked. Defaults to 0.
#security_require_confined = 1
# The user for QEMU processes run by the system instance. It can be
# specified as a user name or as a user id. The qemu driver will try to
# parse this value first as a name and then, if the name doesn't exist,
# as a user id.
#
# Since a sequence of digits is a valid user name, a leading plus sign
# can be used to ensure that a user id will not be interpreted as a user
# name.
#
# Some examples of valid values are:
#
# user = "qemu" # A user named "qemu"
# user = "+0" # Super user (uid=0)
# user = "100" # A user named "100" or a user with uid=100
#
user = "florian"
# The group for QEMU processes run by the system instance. It can be
# specified in a similar way to user.
group = "kvm"
# Whether libvirt should dynamically change file ownership
# to match the configured user/group above. Defaults to 1.
# Set to 0 to disable file ownership changes.
#dynamic_ownership = 1
# Whether libvirt should remember and restore the original
# ownership over files it is relabeling. Defaults to 1, set
# to 0 to disable the feature.
#remember_owner = 1
# What cgroup controllers to make use of with QEMU guests
#
# - 'cpu' - use for scheduler tunables
# - 'devices' - use for device access control
# - 'memory' - use for memory tunables
# - 'blkio' - use for block devices I/O tunables
# - 'cpuset' - use for CPUs and memory nodes
# - 'cpuacct' - use for CPUs statistics.
#
# NB, even if configured here, they won't be used unless
# the administrator has mounted cgroups, e.g.:
#
# mkdir /dev/cgroup
# mount -t cgroup -o devices,cpu,memory,blkio,cpuset none /dev/cgroup
#
# They can be mounted anywhere, and different controllers
# can be mounted in different locations. libvirt will detect
# where they are located.
#
#cgroup_controllers = [ "cpu", "devices", "memory", "blkio", "cpuset", "cpuacct" ]
# This is the basic set of devices allowed / required by
# all virtual machines.
#
# As well as this, any configured block backed disks,
# all sound device, and all PTY devices are allowed.
#
# This will only need setting if newer QEMU suddenly
# wants some device we don't already know about.
#
cgroup_device_acl = [
"/dev/null", "/dev/full", "/dev/zero",
"/dev/random", "/dev/urandom",
"/dev/ptmx", "/dev/kvm", "/dev/kqemu",
"/dev/rtc", "/dev/hpet", "/dev/sev"
]
#
# RDMA migration requires the following extra files to be added to the list:
# "/dev/infiniband/rdma_cm",
# "/dev/infiniband/issm0",
# "/dev/infiniband/issm1",
# "/dev/infiniband/umad0",
# "/dev/infiniband/umad1",
# "/dev/infiniband/uverbs0"
# The default format for QEMU/KVM guest save images is raw; that is, the
# memory from the domain is dumped out directly to a file. If you have
# guests with a large amount of memory, however, this can take up quite
# a bit of space. If you would like to compress the images while they
# are being saved to disk, you can also set "lzop", "gzip", "bzip2", or "xz"
# for save_image_format. Note that this means you slow down the process of
# saving a domain in order to save disk space; the list above is in descending
# order by performance and ascending order by compression ratio.
#
# save_image_format is used when you use 'virsh save' or 'virsh managedsave'
# at scheduled saving, and it is an error if the specified save_image_format
# is not valid, or the requested compression program can't be found.
#
# dump_image_format is used when you use 'virsh dump' at emergency
# crashdump, and if the specified dump_image_format is not valid, or
# the requested compression program can't be found, this falls
# back to "raw" compression.
#
# snapshot_image_format specifies the compression algorithm of the memory save
# image when an external snapshot of a domain is taken. This does not apply
# on disk image format. It is an error if the specified format isn't valid,
# or the requested compression program can't be found.
#
#save_image_format = "raw"
#dump_image_format = "raw"
#snapshot_image_format = "raw"
# When a domain is configured to be auto-dumped when libvirtd receives a
# watchdog event from qemu guest, libvirtd will save dump files in directory
# specified by auto_dump_path. Default value is /var/lib/libvirt/qemu/dump
#
#auto_dump_path = "/var/lib/libvirt/qemu/dump"
# When a domain is configured to be auto-dumped, enabling this flag
# has the same effect as using the VIR_DUMP_BYPASS_CACHE flag with the
# virDomainCoreDump API. That is, the system will avoid using the
# file system cache while writing the dump file, but may cause
# slower operation.
#
#auto_dump_bypass_cache = 0
# When a domain is configured to be auto-started, enabling this flag
# has the same effect as using the VIR_DOMAIN_START_BYPASS_CACHE flag
# with the virDomainCreateWithFlags API. That is, the system will
# avoid using the file system cache when restoring any managed state
# file, but may cause slower operation.
#
#auto_start_bypass_cache = 0
# If provided by the host and a hugetlbfs mount point is configured,
# a guest may request huge page backing. When this mount point is
# unspecified here, determination of a host mount point in /proc/mounts
# will be attempted. Specifying an explicit mount overrides detection
# of the same in /proc/mounts. Setting the mount point to "" will
# disable guest hugepage backing. If desired, multiple mount points can
# be specified at once, separated by comma and enclosed in square
# brackets, for example:
#
# hugetlbfs_mount = ["/dev/hugepages2M", "/dev/hugepages1G"]
#
# The size of huge page served by specific mount point is determined by
# libvirt at the daemon startup.
#
# NB, within these mount points, guests will create memory backing
# files in a location of $MOUNTPOINT/libvirt/qemu
#
#hugetlbfs_mount = "/dev/hugepages"
# Path to the setuid helper for creating tap devices. This executable
# is used to create <source type='bridge'> interfaces when libvirtd is
# running unprivileged. libvirt invokes the helper directly, instead
# of using "-netdev bridge", for security reasons.
#bridge_helper = "/usr/lib/qemu/qemu-bridge-helper"
# If enabled, libvirt will have QEMU set its process name to
# "qemu:VM_NAME", where VM_NAME is the name of the VM. The QEMU
# process will appear as "qemu:VM_NAME" in process listings and
# other system monitoring tools. By default, QEMU does not set
# its process title, so the complete QEMU command (emulator and
# its arguments) appear in process listings.
#
#set_process_name = 1
# If max_processes is set to a positive integer, libvirt will use
# it to set the maximum number of processes that can be run by qemu
# user. This can be used to override default value set by host OS.
# The same applies to max_files which sets the limit on the maximum
# number of opened files.
#
#max_processes = 0
#max_files = 0
# If max_threads_per_process is set to a positive integer, libvirt
# will use it to set the maximum number of threads that can be
# created by a qemu process. Some VM configurations can result in
# qemu processes with tens of thousands of threads. systemd-based
# systems typically limit the number of threads per process to
# 16k. max_threads_per_process can be used to override default
# limits in the host OS.
#
#max_threads_per_process = 0
# If max_core is set to a non-zero integer, then QEMU will be
# permitted to create core dumps when it crashes, provided its
# RAM size is smaller than the limit set.
#
# Be warned that the core dump will include a full copy of the
# guest RAM, if the 'dump_guest_core' setting has been enabled,
# or if the guest XML contains
#
# <memory dumpcore="on">...guest ram...</memory>
#
# If guest RAM is to be included, ensure the max_core limit
# is set to at least the size of the largest expected guest
# plus another 1GB for any QEMU host side memory mappings.
#
# As a special case it can be set to the string "unlimited" to
# to allow arbitrarily sized core dumps.
#
# By default the core dump size is set to 0 disabling all dumps
#
# Size is a positive integer specifying bytes or the
# string "unlimited"
#
#max_core = "unlimited"
# Determine if guest RAM is included in QEMU core dumps. By
# default guest RAM will be excluded if a new enough QEMU is
# present. Setting this to '1' will force guest RAM to always
# be included in QEMU core dumps.
#
# This setting will be ignored if the guest XML has set the
# dumpcore attribute on the <memory> element.
#
#dump_guest_core = 1
# mac_filter enables MAC addressed based filtering on bridge ports.
# This currently requires ebtables to be installed.
#
#mac_filter = 1
# By default, PCI devices below non-ACS switch are not allowed to be assigned
# to guests. By setting relaxed_acs_check to 1 such devices will be allowed to
# be assigned to guests.
#
#relaxed_acs_check = 1
# In order to prevent accidentally starting two domains that
# share one writable disk, libvirt offers two approaches for
# locking files. The first one is sanlock, the other one,
# virtlockd, is then our own implementation. Accepted values
# are "sanlock" and "lockd".
#
#lock_manager = "lockd"
# Set limit of maximum APIs queued on one domain. All other APIs
# over this threshold will fail on acquiring job lock. Specially,
# setting to zero turns this feature off.
# Note, that job lock is per domain.
#
#max_queued = 0
###################################################################
# Keepalive protocol:
# This allows qemu driver to detect broken connections to remote
# libvirtd during peer-to-peer migration. A keepalive message is
# sent to the daemon after keepalive_interval seconds of inactivity
# to check if the daemon is still responding; keepalive_count is a
# maximum number of keepalive messages that are allowed to be sent
# to the daemon without getting any response before the connection
# is considered broken. In other words, the connection is
# automatically closed approximately after
# keepalive_interval * (keepalive_count + 1) seconds since the last
# message received from the daemon. If keepalive_interval is set to
# -1, qemu driver will not send keepalive requests during
# peer-to-peer migration; however, the remote libvirtd can still
# send them and source libvirtd will send responses. When
# keepalive_count is set to 0, connections will be automatically
# closed after keepalive_interval seconds of inactivity without
# sending any keepalive messages.
#
#keepalive_interval = 5
#keepalive_count = 5
# Use seccomp syscall filtering sandbox in QEMU.
# 1 == filter enabled, 0 == filter disabled
#
# Unless this option is disabled, QEMU will be run with
# a seccomp filter that stops it from executing certain
# syscalls.
#
#seccomp_sandbox = 1
# Override the listen address for all incoming migrations. Defaults to
# 0.0.0.0, or :: if both host and qemu are capable of IPv6.
#migration_address = "0.0.0.0"
# The default hostname or IP address which will be used by a migration
# source for transferring migration data to this host. The migration
# source has to be able to resolve this hostname and connect to it so
# setting "localhost" will not work. By default, the host's configured
# hostname is used.
#migration_host = "host.example.com"
# Override the port range used for incoming migrations.
#
# Minimum must be greater than 0, however when QEMU is not running as root,
# setting the minimum to be lower than 1024 will not work.
#
# Maximum must not be greater than 65535.
#
#migration_port_min = 49152
#migration_port_max = 49215
# Timestamp QEMU's log messages (if QEMU supports it)
#
# Defaults to 1.
#
#log_timestamp = 0
# Location of master nvram file
#
# This configuration option is obsolete. Libvirt will follow the
# QEMU firmware metadata specification to automatically locate
# firmware images. See docs/interop/firmware.json in the QEMU
# source tree. These metadata files are distributed alongside any
# firmware images intended for use with QEMU.
#
# NOTE: if ANY firmware metadata files are detected, this setting
# will be COMPLETELY IGNORED.
#
# ------------------------------------------
#
# When a domain is configured to use UEFI instead of standard
# BIOS it may use a separate storage for UEFI variables. If
# that's the case libvirt creates the variable store per domain
# using this master file as image. Each UEFI firmware can,
# however, have different variables store. Therefore the nvram is
# a list of strings when a single item is in form of:
# ${PATH_TO_UEFI_FW}:${PATH_TO_UEFI_VARS}.
# Later, when libvirt creates per domain variable store, this list is
# searched for the master image. The UEFI firmware can be called
# differently for different guest architectures. For instance, it's OVMF
# for x86_64 and i686, but it's AAVMF for aarch64. The libvirt default
# follows this scheme.
#nvram = [
# "/usr/share/OVMF/OVMF_CODE.fd:/usr/share/OVMF/OVMF_VARS.fd",
# "/usr/share/OVMF/OVMF_CODE.secboot.fd:/usr/share/OVMF/OVMF_VARS.fd",
# "/usr/share/AAVMF/AAVMF_CODE.fd:/usr/share/AAVMF/AAVMF_VARS.fd",
# "/usr/share/AAVMF/AAVMF32_CODE.fd:/usr/share/AAVMF/AAVMF32_VARS.fd"
#]
# The backend to use for handling stdout/stderr output from
# QEMU processes.
#
# 'file': QEMU writes directly to a plain file. This is the
# historical default, but allows QEMU to inflict a
# denial of service attack on the host by exhausting
# filesystem space
#
# 'logd': QEMU writes to a pipe provided by virtlogd daemon.
# This is the current default, providing protection
# against denial of service by performing log file
# rollover when a size limit is hit.
#
#stdio_handler = "logd"
# QEMU gluster libgfapi log level, debug levels are 0-9, with 9 being the
# most verbose, and 0 representing no debugging output.
#
# The current logging levels defined in the gluster GFAPI are:
#
# 0 - None
# 1 - Emergency
# 2 - Alert
# 3 - Critical
# 4 - Error
# 5 - Warning
# 6 - Notice
# 7 - Info
# 8 - Debug
# 9 - Trace
#
# Defaults to 4
#
#gluster_debug_level = 9
# virtiofsd debug
#
# Whether to enable the debugging output of the virtiofsd daemon.
# Possible values are 0 or 1. Disabled by default.
#
#virtiofsd_debug = 1
# To enhance security, QEMU driver is capable of creating private namespaces
# for each domain started. Well, so far only "mount" namespace is supported. If
# enabled it means qemu process is unable to see all the devices on the system,
# only those configured for the domain in question. Libvirt then manages
# devices entries throughout the domain lifetime. This namespace is turned on
# by default.
#namespaces = [ "mount" ]
# This directory is used for memoryBacking source if configured as file.
# NOTE: big files will be stored here
#memory_backing_dir = "/var/lib/libvirt/qemu/ram"
# Path to the SCSI persistent reservations helper. This helper is
# used whenever <reservations/> are enabled for SCSI LUN devices.
#pr_helper = "/usr/bin/qemu-pr-helper"
# Path to the SLIRP networking helper.
#slirp_helper = "/usr/bin/slirp-helper"
# Path to the dbus-daemon
#dbus_daemon = "/usr/bin/dbus-daemon"
# User for the swtpm TPM Emulator
#
# Default is 'tss'; this is the same user that tcsd (TrouSerS) installs
# and uses; alternative is 'root'
#
#swtpm_user = "tss"
#swtpm_group = "tss"
# For debugging and testing purposes it's sometimes useful to be able to disable
# libvirt behaviour based on the capabilities of the qemu process. This option
# allows to do so. DO _NOT_ use in production and beaware that the behaviour
# may change across versions.
#
#capability_filters = [ "capname" ]
# 'deprecation_behavior' setting controls how the qemu process behaves towards
# deprecated commands and arguments used by libvirt.
#
# This setting is meant for developers and CI efforts to make it obvious when
# libvirt relies on fields which are deprecated so that it can be fixes as soon
# as possible.
#
# Possible options are:
# "none" - (default) qemu is supposed to accept and output deprecated fields
# and commands
# "omit" - qemu is instructed to omit deprecated fields on output, behaviour
# towards fields and commands from qemu is not changed
# "reject" - qemu is instructed to report an error if a deprecated command or
# field is used by libvirtd
# "crash" - qemu crashes when an deprecated command or field is used by libvirtd
#
# For both "reject" and "crash" qemu is instructed to omit any deprecated fields
# on output.
#
# The "reject" option is less harsh towards the VMs but some code paths ignore
# errors reported by qemu and thus it may not be obvious that a deprecated
# command/field was used, thus it's suggested to use the "crash" option instead.
#
# In cases when qemu doesn't support configuring the behaviour this setting is
# silently ignored to allow testing older qemu versions without having to
# reconfigure libvirtd.
#
# DO NOT use in production.
#
#deprecation_behavior = "none"

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