This file is indexed.

/etc/xen/xend-pci-permissive.sxp 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.

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###############################################################################
# Configuration file for granting quiry PCI devices full write access to their 
# configuration space.  This file should only be used when you are unable to 
# determine the exact registers required by your device.  Even so, it should 
# be used only temporarily.
# 
# SEND A MESSAGE TO xen-devel@lists.xensource.com IF YOU USE THIS FILE.
# 
# Using this file should NOT be necessary.  If you must use it to make some
# device work, send a message to the above list with as much information about 
# your device as possible so the developers can make accomodations for it.  
# Once developers make the necessary updates you can remove the corresponding
# entry for your device. 
###############################################################################
# Entries are formated as follows:  <vendor>:<device>[:<subvendor>:<subdevice>]
# 
# Example: Appending to an existing list
#  
# (unconstrained_dev_ids
#     ('XXXX:XXXX:XXXX:XXXX'	# existing entry
#      'YYYY:YYYY:YYYY:YYYY' 	# new entry 1
#      'ZZZZ:ZZZZ')		# new entry 2
# )
###############################################################################
(unconstrained_dev_ids
     #('0123:4567:89AB:CDEF')
)