/etc/xen/xl.conf is in xen-utils-common 4.4.0-0ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | ## Global XL config file ##
# Control whether dom0 is ballooned down when xen doesn't have enough
# free memory to create a domain. "auto" means only balloon if dom0
# starts with all the host's memory.
#autoballoon="auto"
# full path of the lockfile used by xl during domain creation
#lockfile="/var/lock/xl"
# default output format used by "xl list -l"
#output_format="json"
# first block device to be used for temporary VM disk mounts
#blkdev_start="xvda"
# default option to run hotplug scripts from xl
# if disabled the old behaviour will be used, and hotplug scripts will be
# launched by udev.
#run_hotplug_scripts=1
# default backend domain to connect guest vifs to. This can be any
# valid domain identifier.
#vif.default.backend="0"
# default gateway device to use with vif-route hotplug script
#vif.default.gatewaydev="eth0"
# default vif script to use if none is specified in the guest config
#vif.default.script="vif-bridge"
# default bridge device to use with vif-bridge hotplug scripts
#vif.default.bridge="xenbr0"
# Reserve a claim of memory when launching a guest. This guarantees immediate
# feedback whether the guest can be launched due to memory exhaustion
# (which can take a long time to find out if launching huge guests).
# see xl.conf(5) for details.
#claim_mode=1
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