/etc/xen/xl.conf is in xen-utils-common 4.1.4-3+deb7u9.
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 | ## Global XL config file ##
# automatically balloon down dom0 when xen doesn't have enough free
# memory to create a domain
#autoballoon=1
# full path of the lockfile used by xl during domain creation
#lockfile="/var/lock/xl"
# default vif script
#vifscript="vif-bridge"
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