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42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
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#!/bin/sh
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# SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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## Credits: https://www.qubes-os.org/doc/how-to-use-pci-devices/#bringing-pci-devices-back-to-dom0
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##
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## After attaching a PCI device and detaching it, the device is not available
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## in Dom0 anymore. This is an intended feature. A device which was previously
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## assigned to a less trusted qube could attack dom0 if it were automatically
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## reassigned there. In order to re-enable the device in dom0, either reboot
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## physical machine or run the following script.
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##
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## This is useful for testing purposes when testing PCI devices, not
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## recommended for users to attach a device to Dom0.
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set -eu
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usage(){
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echo "Usage: ${0##*/} --i-like-danger <DEVICE>"
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echo "Example: ${0##*/} --i-like-danger 0000:00:1b.0"
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echo "Warning: It is strongly discouraged to reattach PCI devices to dom0, especially if they don’t support resetting!"
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exit 1
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}
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case "${1-}" in
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--i-like-danger) ;;
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*) usage;;
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esac
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case "${2-}" in
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"") usage;;
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*) device="$2"
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esac
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test "$(id -u)" = "0" || exec sudo "${0}"
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echo "$device" | tee /sys/bus/pci/drivers/pciback/unbind
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modalias="$(cat "/sys/bus/pci/devices/$device/modalias")"
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mod="$(modprobe -R "$modalias | head -n 1)"
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echo "$device" | tee "/sys/bus/pci/drivers/$mod/bind")"
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