xref: /qemu/tests/functional/qemu_test/tuxruntest.py (revision 20f0b8e98b4851bfd52bbb4edd4b602d08b9b817) 
1# Functional test that boots known good tuxboot images the same way
2# that tuxrun (www.tuxrun.org) does. This tool is used by things like
3# the LKFT project to run regression tests on kernels.
4#
5# Copyright (c) 2023 Linaro Ltd.
6#
7# Author:
8#  Alex Bennée <alex.bennee@linaro.org>
9#
10# SPDX-License-Identifier: GPL-2.0-or-later
11
12import os
13import stat
14from subprocess import check_call, DEVNULL
15
16from qemu_test import QemuSystemTest
17from qemu_test import exec_command_and_wait_for_pattern
18from qemu_test import wait_for_console_pattern
19from qemu_test import which, get_qemu_img
20
21class TuxRunBaselineTest(QemuSystemTest):
22
23    KERNEL_COMMON_COMMAND_LINE = 'printk.time=0'
24    # Tests are ~10-40s, allow for --debug/--enable-gcov overhead
25    timeout = 100
26
27    def get_tag(self, tagname, default=None):
28        """
29        Get the metadata tag or return the default.
30        """
31        utag = self._get_unique_tag_val(tagname)
32        print(f"{tagname}/{default} -> {utag}")
33        if utag:
34            return utag
35
36        return default
37
38    def setUp(self):
39        super().setUp()
40
41        # We need zstd for all the tuxrun tests
42        if which('zstd') is None:
43            self.skipTest("zstd not found in $PATH")
44
45        # Pre-init TuxRun specific settings: Most machines work with
46        # reasonable defaults but we sometimes need to tweak the
47        # config. To avoid open coding everything we store all these
48        # details in the metadata for each test.
49
50        # The tuxboot tag matches the root directory
51        self.tuxboot = self.arch
52
53        # Most Linux's use ttyS0 for their serial port
54        self.console = "ttyS0"
55
56        # Does the machine shutdown QEMU nicely on "halt"
57        self.wait_for_shutdown = True
58
59        self.root = "vda"
60
61        # Occasionally we need extra devices to hook things up
62        self.extradev = None
63
64        self.qemu_img = get_qemu_img(self)
65
66    def wait_for_console_pattern(self, success_message, vm=None):
67        wait_for_console_pattern(self, success_message,
68                                 failure_message='Kernel panic - not syncing',
69                                 vm=vm)
70
71    def fetch_tuxrun_assets(self, kernel_asset, rootfs_asset, dtb_asset=None):
72        """
73        Fetch the TuxBoot assets.
74        """
75        kernel_image =  kernel_asset.fetch()
76        disk_image_zst = rootfs_asset.fetch()
77
78        disk_image = self.scratch_file("rootfs.ext4")
79
80        check_call(['zstd', "-f", "-d", disk_image_zst,
81                    "-o", disk_image],
82                   stdout=DEVNULL, stderr=DEVNULL)
83        # zstd copies source archive permissions for the output
84        # file, so must make this writable for QEMU
85        os.chmod(disk_image, stat.S_IRUSR | stat.S_IWUSR)
86
87        dtb = dtb_asset.fetch() if dtb_asset is not None else None
88
89        return (kernel_image, disk_image, dtb)
90
91    def prepare_run(self, kernel, disk, drive, dtb=None, console_index=0):
92        """
93        Setup to run and add the common parameters to the system
94        """
95        self.vm.set_console(console_index=console_index)
96
97        # all block devices are raw ext4's
98        blockdev = "driver=raw,file.driver=file," \
99            + f"file.filename={disk},node-name=hd0"
100
101        kcmd_line = self.KERNEL_COMMON_COMMAND_LINE
102        kcmd_line += f" root=/dev/{self.root}"
103        kcmd_line += f" console={self.console}"
104
105        self.vm.add_args('-kernel', kernel,
106                         '-append', kcmd_line,
107                         '-blockdev', blockdev)
108
109        # Sometimes we need extra devices attached
110        if self.extradev:
111            self.vm.add_args('-device', self.extradev)
112
113        self.vm.add_args('-device',
114                         f"{drive},drive=hd0")
115
116        # Some machines need an explicit DTB
117        if dtb:
118            self.vm.add_args('-dtb', dtb)
119
120    def run_tuxtest_tests(self, haltmsg):
121        """
122        Wait for the system to boot up, wait for the login prompt and
123        then do a few things on the console. Trigger a shutdown and
124        wait to exit cleanly.
125        """
126        ps1='root@tuxtest:~#'
127        self.wait_for_console_pattern('tuxtest login:')
128        exec_command_and_wait_for_pattern(self, 'root', ps1)
129        exec_command_and_wait_for_pattern(self, 'cat /proc/interrupts', ps1)
130        exec_command_and_wait_for_pattern(self, 'cat /proc/self/maps', ps1)
131        exec_command_and_wait_for_pattern(self, 'uname -a', ps1)
132        exec_command_and_wait_for_pattern(self, 'halt', haltmsg)
133
134        # Wait for VM to shut down gracefully if it can
135        if self.wait_for_shutdown:
136            self.vm.wait()
137        else:
138            self.vm.shutdown()
139
140    def common_tuxrun(self,
141                      kernel_asset,
142                      rootfs_asset,
143                      dtb_asset=None,
144                      drive="virtio-blk-device",
145                      haltmsg="reboot: System halted",
146                      console_index=0):
147        """
148        Common path for LKFT tests. Unless we need to do something
149        special with the command line we can process most things using
150        the tag metadata.
151        """
152        (kernel, disk, dtb) = self.fetch_tuxrun_assets(kernel_asset, rootfs_asset,
153                                                       dtb_asset)
154
155        self.prepare_run(kernel, disk, drive, dtb, console_index)
156        self.vm.launch()
157        self.run_tuxtest_tests(haltmsg)
158        os.remove(disk)
159