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b=oBt2aHfmG8mGBmxBE1b3bYOluRibeEOY7520nHe6jqdcs6EiHg+Z02ciEESnvlP0AsI1fcHOhAIqpjw04zyHT+83BB3WJZ57DQvN6ikxLQITthNI74jCgRjNklAI/mTXXAVFI3+REX0piu1smkGBNeoaFFEy0rwmQYobW6LOaltbpDN1OOT/fqranJAaMnGr4rbOWwhNC+k9hYEZrQvwQeFaTsFYHG6wBb8Spn7hiTiOkkAKq2A5yGBgRnF/x3F7UFJvQgJXinAf63uLafL0S1lHpqEWJE3r01CRaTzOqk5okV+Uo0TwaNInUZiba1MJpM6DiO3WAt9QAC4QiMK9Xg== From: John Levon To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Thomas Huth , Zhao Liu , Paolo Bonzini , John Levon , Thanos Makatos , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Mark Cave-Ayland Subject: [PATCH v6] tests/functional: add a vfio-user smoke test Date: Thu, 11 Sep 2025 23:09:05 +0200 Message-ID: <20250911210905.2070474-1-john.levon@nutanix.com> X-Mailer: git-send-email 2.43.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO6P265CA0021.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:2ff::14) To CH2PR02MB6760.namprd02.prod.outlook.com (2603:10b6:610:7f::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR02MB6760:EE_|DM6PR02MB6713:EE_ X-MS-Office365-Filtering-Correlation-Id: e1b89fd1-9978-410d-7a30-08ddf177733e x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016; 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charset="utf-8" From: Mark Cave-Ayland Add a basic test of the vfio-user PCI client implementation. Co-authored-by: John Levon Signed-off-by: Mark Cave-Ayland Signed-off-by: John Levon Reviewed-by: Thomas Huth --- MAINTAINERS | 1 + tests/functional/x86_64/meson.build | 1 + .../x86_64/test_vfio_user_client.py | 201 ++++++++++++++++++ 3 files changed, 203 insertions(+) create mode 100755 tests/functional/x86_64/test_vfio_user_client.py diff --git a/MAINTAINERS b/MAINTAINERS index fb045388b9..738db4f83b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4307,6 +4307,7 @@ F: docs/system/devices/vfio-user.rst F: hw/vfio-user/* F: include/hw/vfio-user/* F: subprojects/libvfio-user +F: tests/functional/x86_64/test_vfio_user_client.py =20 EBPF: M: Jason Wang diff --git a/tests/functional/x86_64/meson.build b/tests/functional/x86_64/= meson.build index d0b4667bb8..eed1936976 100644 --- a/tests/functional/x86_64/meson.build +++ b/tests/functional/x86_64/meson.build @@ -31,6 +31,7 @@ tests_x86_64_system_thorough =3D [ 'replay', 'reverse_debug', 'tuxrun', + 'vfio_user_client', 'virtio_balloon', 'virtio_gpu', ] diff --git a/tests/functional/x86_64/test_vfio_user_client.py b/tests/funct= ional/x86_64/test_vfio_user_client.py new file mode 100755 index 0000000000..8bc16e5e31 --- /dev/null +++ b/tests/functional/x86_64/test_vfio_user_client.py @@ -0,0 +1,201 @@ +#!/usr/bin/env python3 +# +# Copyright (c) 2025 Nutanix, Inc. +# +# Author: +# Mark Cave-Ayland +# John Levon +# +# SPDX-License-Identifier: GPL-2.0-or-later +""" +Check basic vfio-user-pci client functionality. The test starts two VMs: + + - the server VM runs the libvfio-user "gpio" example server inside it, + piping vfio-user traffic between a local UNIX socket and a virtio-se= rial + port. On the host, the virtio-serial port is backed by a local socke= t. + + - the client VM loads the gpio-pci-idio-16 kernel module, with the + vfio-user client connecting to the above local UNIX socket. + +This way, we don't depend on trying to run a vfio-user server on the host +itself. + +Once both VMs are running, we run some basic configuration on the gpio dev= ice +and verify that the server is logging the expected out. As this is consist= ent +given the same VM images, we just do a simple direct comparison. +""" + +import os + +from qemu_test import Asset +from qemu_test import QemuSystemTest +from qemu_test import exec_command_and_wait_for_pattern +from qemu_test import wait_for_console_pattern + +# Exact output can vary, so we just sample for some expected lines. +EXPECTED_SERVER_LINES =3D [ + "gpio: adding DMA region [0, 0xc0000) offset=3D0 flags=3D0x3", + "gpio: devinfo flags 0x3, num_regions 9, num_irqs 5", + "gpio: region_info[0] offset 0 flags 0 size 0 argsz 32", + "gpio: region_info[1] offset 0 flags 0 size 0 argsz 32", + "gpio: region_info[2] offset 0 flags 0x3 size 256 argsz 32", + "gpio: region_info[3] offset 0 flags 0 size 0 argsz 32", + "gpio: region_info[4] offset 0 flags 0 size 0 argsz 32", + "gpio: region_info[5] offset 0 flags 0 size 0 argsz 32", + "gpio: region_info[7] offset 0 flags 0x3 size 256 argsz 32", + "gpio: region7: read 256 bytes at 0", + "gpio: region7: read 0 from (0x30:4)", + "gpio: cleared EROM", + "gpio: I/O space enabled", + "gpio: memory space enabled", + "gpio: SERR# enabled", + "gpio: region7: wrote 0x103 to (0x4:2)", + "gpio: I/O space enabled", + "gpio: memory space enabled", +] + +class VfioUserClient(QemuSystemTest): + """vfio-user testing class.""" + + ASSET_REPO =3D 'https://github.com/mcayland-ntx/libvfio-user-test' + + ASSET_KERNEL =3D Asset( + f'{ASSET_REPO}/raw/refs/heads/main/images/bzImage', + '40292fa6ce95d516e26bccf5974e138d0db65a6de0bc540cabae060fe9dea605' + ) + + ASSET_ROOTFS =3D Asset( + f'{ASSET_REPO}/raw/refs/heads/main/images/rootfs.ext2', + 'e1e3abae8aebb8e6e77f08b1c531caeacf46250c94c815655c6bbea59fc3d1c1' + ) + + def __init__(self, *args, **kwargs): + super().__init__(*args, **kwargs) + + self.kernel_path =3D None + self.rootfs_path =3D None + + def configure_server_vm_args(self, server_vm, sock_path): + """ + Configuration for the server VM. Set up virtio-serial device backe= d by + the given socket path. + """ + server_vm.add_args('-kernel', self.kernel_path) + server_vm.add_args('-append', 'console=3DttyS0 root=3D/dev/sda') + server_vm.add_args('-drive', + f"file=3D{self.rootfs_path},if=3Dide,format=3Draw,id=3Ddrv0") + server_vm.add_args('-snapshot') + server_vm.add_args('-chardev', + f"socket,id=3Dsock0,path=3D{sock_path},telnet=3Doff,server=3Do= n,wait=3Doff") + server_vm.add_args('-device', 'virtio-serial') + server_vm.add_args('-device', + 'virtserialport,chardev=3Dsock0,name=3Dorg.fedoraproject.port.= 0') + + def configure_client_vm_args(self, client_vm, sock_path): + """ + Configuration for the client VM. Point the vfio-user-pci device to= the + socket path configured above. + """ + + client_vm.add_args('-kernel', self.kernel_path) + client_vm.add_args('-append', 'console=3DttyS0 root=3D/dev/sda') + client_vm.add_args('-drive', + f'file=3D{self.rootfs_path},if=3Dide,format=3Draw,id=3Ddrv0') + client_vm.add_args('-snapshot') + client_vm.add_args('-device', + '{"driver":"vfio-user-pci",' + + '"socket":{"path": "%s", "type": "unix"}}' % sock_path) + + def setup_vfio_user_pci_server(self, server_vm): + """ + Start the libvfio-user server within the server VM, and arrange + for data to shuttle between its socket and the virtio serial port. + """ + wait_for_console_pattern(self, 'login:', None, server_vm) + exec_command_and_wait_for_pattern(self, 'root', '#', None, server_= vm) + + exec_command_and_wait_for_pattern(self, + 'gpio-pci-idio-16 -v /tmp/vfio-user.sock >/var/tmp/gpio.out 2>= &1 &', + '#', None, server_vm) + + # wait for libvfio-user socket to appear + while True: + out =3D exec_command_and_wait_for_pattern(self, + 'ls --color=3Dno /tmp/vfio-user.sock', '#', None, server_= vm) + ls_out =3D out.decode().splitlines()[1].strip() + if ls_out =3D=3D "/tmp/vfio-user.sock": + break + + exec_command_and_wait_for_pattern(self, + 'socat UNIX-CONNECT:/tmp/vfio-user.sock /dev/vport0p1,ignoreeo= f ' + + ' &', '#', None, server_vm) + + def test_vfio_user_pci(self): + """Run basic sanity test.""" + + self.set_machine('pc') + self.require_device('virtio-serial') + self.require_device('vfio-user-pci') + + self.kernel_path =3D self.ASSET_KERNEL.fetch() + self.rootfs_path =3D self.ASSET_ROOTFS.fetch() + + sock_dir =3D self.socket_dir() + socket_path =3D os.path.join(sock_dir.name, 'vfio-user.sock') + + server_vm =3D self.get_vm(name=3D'server') + server_vm.set_console() + self.configure_server_vm_args(server_vm, socket_path) + + server_vm.launch() + + self.log.debug('starting libvfio-user server') + + self.setup_vfio_user_pci_server(server_vm) + + client_vm =3D self.get_vm(name=3D"client") + client_vm.set_console() + self.configure_client_vm_args(client_vm, socket_path) + + try: + client_vm.launch() + except: + self.log.error('client VM failed to start, dumping server logs= ') + exec_command_and_wait_for_pattern(self, 'cat /var/tmp/gpio.out= ', + '#', None, server_vm) + raise + + self.log.debug('waiting for client VM boot') + + wait_for_console_pattern(self, 'login:', None, client_vm) + exec_command_and_wait_for_pattern(self, 'root', '#', None, client_= vm) + + # + # Here, we'd like to actually interact with the gpio device a litt= le + # more as described at: + # + # https://github.com/nutanix/libvfio-user/blob/master/docs/qemu.md + # + # Unfortunately, the buildroot Linux kernel has some undiagnosed i= ssue + # so we don't get /sys/class/gpio. Nonetheless just the basic + # initialization and setup is enough for basic testing of vfio-use= r. + # + + self.log.debug('collecting libvfio-user server output') + + out =3D exec_command_and_wait_for_pattern(self, + 'cat /var/tmp/gpio.out', + 'gpio: region2: wrote 0 to (0x1:1)', + None, server_vm) + + gpio_server_out =3D [s for s in out.decode().splitlines() + if s.startswith("gpio:")] + + for line in EXPECTED_SERVER_LINES: + if line not in gpio_server_out: + self.log.error(f'Missing server debug line: {line}') + self.fail(False) + + +if __name__ =3D=3D '__main__': + QemuSystemTest.main() --=20 2.43.0