/etc/xen/xend-pci-permissive.sxp is in xen-utils-common 4.6.0-1ubuntu4.
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')
)
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