This file is indexed.

/etc/xen/xend-pci-quirks.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 quirky PCI devices that require write-access to 
# parts of the configuration space.  Use this file to specific PCI device
# IDs and the configuration space fields to which those devices must be
# able to write.
#
# Length is important, so be sure to match new entries with the 
# lengths of comparable existing entries. 
#
# Additions to this file take effect as soon as a new domain with a 
# matching device is started.  However, to remove a field that was 
# previously applied to a device you must unbind the device from 
# pciback.
###############################################################################
# This is a bogus entry to show how a new device would be added to the list
#
# (new_quirky_dev_name
#    (pci_ids 
#       ('0123:4567:890A:BCEF') 
#    )
#
#    (pci_config_space_fields 
#       ('12345678:1:00000000')
#    )
# )
###############################################################################

(tg3
    (pci_ids
	# Entries are formated as follows:  
	#     <vendor>:<device>[:<subvendor>:<subdevice>]
        ('14e4:1644'   # Broadcom Tigon3 5700
    	 '14e4:1645'   # Broadcom Tigon3 5701
         '14e4:1646'   # Broadcom Tigon3 5702
         '14e4:1647'   # Broadcom Tigon3 5703
         '14e4:1648'   # Broadcom Tigon3 5704
         '14e4:164d'   # Broadcom Tigon3 5702FE
         '14e4:1653'   # Broadcom Tigon3 5705
         '14e4:1654'   # Broadcom Tigon3 5705_2
         '14e4:165d'   # Broadcom Tigon3 5705M
         '14e4:165e'   # Broadcom Tigon3 5705M_2
         '14e4:16a6'   # Broadcom Tigon3 5702X
         '14e4:16a7'   # Broadcom Tigon3 5703X
         '14e4:16a8'   # Broadcom Tigon3 5704S
         '14e4:16c6'   # Broadcom Tigon3 5702A3
         '14e4:16c7'   # Broadcom Tigon3 5703A3
         '14e4:1696'   # Broadcom Tigon3 5782
         '14e4:169c'   # Broadcom Tigon3 5788
         '14e4:169d'   # Broadcom Tigon3 5789
         '14e4:170d'   # Broadcom Tigon3 5901
         '14e4:1649'   # Broadcom Tigon3 5704S_2
         '14e4:166e'   # Broadcom Tigon3 5705F
         '14e4:1658'   # Broadcom Tigon3 5720
         '14e4:1659'   # Broadcom Tigon3 5721
         '14e4:1676'   # Broadcom Tigon3 5750
         '14e4:1677'   # Broadcom Tigon3 5751
         '14e4:167c'   # Broadcom Tigon3 5750M
         '14e4:167d'   # Broadcom Tigon3 5751M
         '14e4:167e'   # Broadcom Tigon3 5751F
         '14e4:1600'   # Broadcom Tigon3 5752
         '14e4:1601'   # Broadcom Tigon3 5752M
         '14e4:16f7'   # Broadcom Tigon3 5753
         '14e4:16fd'   # Broadcom Tigon3 5753M
         '14e4:16fe'   # Broadcom Tigon3 5753F
         '14e4:1668'   # Broadcom Tigon3 5714
         '14e4:1678'   # Broadcom Tigon3 5715
         '14e4:166a'   # Broadcom Tigon3 5780
         '14e4:166b'   # Broadcom Tigon3 5780S
         '14e4:16dd'   # Broadcom Tigon3 5781
         '1148:4400'   # Syskonnect 9DXX
         '1148:4500'   # Syskonnect 9MXX
         '173b:03e8'   # Altima AC1000
         '173b:03e9'   # Altima AC1001
         '173b:03eb'   # Altima AC1003
         '173b:03ea'   # Altima AC9100
         '106b:1645')  # Apple Tigon3
    )

    (pci_config_space_fields
	# Entries are formated as follows:  
    	#     <register>:<size>:<mask>
    	# size is measured in bytes (1,2,4 are valid sizes)
    	# mask is currently unused; use all zero's
        ('00000078:4:00000000'   # TG3PCI_REG_BASE_ADDR
         '0000007c:4:00000000'   # TG3PCI_MEM_WIN_BASE_ADDR
         '00000080:4:00000000'   # TG3PCI_REG_DATA
         '00000084:4:00000000'   # TG3PCI_MEM_WIN_DATA
         '00000090:4:00000000'   # TG3PCI_MISC_LOCAL_CTRL
         '00000068:4:00000000'   # TG3PCI_MISC_HOST_CTRL
         '0000009C:4:00000000'   # TG3PCI_STD_RING_PROD_IDX + TG3_64BIT_REG_LOW
         '00000098:4:00000000'   # TG3PCI_STD_RING_PROD_IDX + TG3_64BIT_REG_HIGH
         '000000a4:4:00000000'   # TG3PCI_RCV_RET_RING_CON_IDX + TG3_64BIT_REG_LOW
         '000000a0:4:00000000'   # TG3PCI_RCV_RET_RING_CON_IDX + TG3_64BIT_REG_HIGH
         '00000070:4:00000000')  # TG3PCI_PCISTATE
    )
)