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#!/usr/bin/env python3
#
# The test hotplugs a PCI device and checks it on a Linux guest.
#
# Copyright (c) 2025 Linaro Ltd.
#
# Author:
# Gustavo Romero <gustavo.romero@linaro.org>
#
# SPDX-License-Identifier: GPL-2.0-or-later
from qemu_test import LinuxKernelTest, Asset, exec_command_and_wait_for_pattern
from qemu_test import BUILD_DIR
class HotplugPCI(LinuxKernelTest):
ASSET_KERNEL = Asset(
('https://ftp.debian.org/debian/dists/trixie/main/installer-arm64/'
'20250803/images/netboot/debian-installer/arm64/linux'),
'93a6e4f9627d759375d28f863437a86a0659e125792a435f8e526dda006b7d5e')
ASSET_INITRD = Asset(
('https://ftp.debian.org/debian/dists/trixie/main/installer-arm64/'
'20250803/images/netboot/debian-installer/arm64/initrd.gz'),
'f6c78af7078ca67638ef3a50c926cd3c1485673243f8b37952e6bd854d6ba007')
def test_hotplug_pci(self):
self.set_machine('virt')
self.vm.add_args('-m', '512M',
'-cpu', 'cortex-a57',
'-append',
'console=ttyAMA0,115200 init=/bin/sh',
'-device',
'pcie-root-port,bus=pcie.0,chassis=1,slot=1,id=pcie.1',
'-bios',
self.build_file('pc-bios', 'edk2-aarch64-code.fd'))
# BusyBox prompt
prompt = "~ #"
self.launch_kernel(self.ASSET_KERNEL.fetch(),
self.ASSET_INITRD.fetch(),
wait_for=prompt)
# Check for initial state: 2 network adapters, lo and enp0s1.
exec_command_and_wait_for_pattern(self,
'ls /sys/class/net | wc -l',
'2')
# Hotplug one network adapter to the root port, i.e. pcie.1 bus.
self.vm.cmd('device_add',
driver='virtio-net-pci',
bus='pcie.1',
addr=0,
id='na')
# Wait for the kernel to recognize the new device.
self.wait_for_console_pattern('virtio-pci')
self.wait_for_console_pattern('virtio_net')
# Check if there is a new network adapter.
exec_command_and_wait_for_pattern(self,
'ls /sys/class/net | wc -l',
'3')
self.vm.cmd('device_del', id='na')
exec_command_and_wait_for_pattern(self,
'ls /sys/class/net | wc -l',
'2')
if __name__ == '__main__':
LinuxKernelTest.main()
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