/usr/share/doc/qemu-system-common/ich9-ehci-uhci.cfg is in qemu-system-common 1:2.5+dfsg-5ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# You can pass this file directly to qemu using the -readconfig
# command line switch.
#
# This config file creates a EHCI adapter with companion UHCI
# controllers as multifunction device in PCI slot "1d".
#
# Specify "bus=ehci.0" when creating usb devices to hook them up
# there.
#
[device "ehci"]
driver = "ich9-usb-ehci1"
addr = "1d.7"
multifunction = "on"
[device "uhci-1"]
driver = "ich9-usb-uhci1"
addr = "1d.0"
multifunction = "on"
masterbus = "ehci.0"
firstport = "0"
[device "uhci-2"]
driver = "ich9-usb-uhci2"
addr = "1d.1"
multifunction = "on"
masterbus = "ehci.0"
firstport = "2"
[device "uhci-3"]
driver = "ich9-usb-uhci3"
addr = "1d.2"
multifunction = "on"
masterbus = "ehci.0"
firstport = "4"
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