Date:   Tue, 21 Jul 2020 14:29:50 -0300
From:   Vitor Massaru Iha <vitor@...saru.org>
To:     kunit-dev@...glegroups.com
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        brendanhiggins@...gle.com, keescook@...omium.org,
        davidgow@...gle.com, skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [RFC v3] kunit: Allows to install and load modules in root filesystem

This makes possible to install and load KUnit tests
as modules in a root filesystem and boot UML with
this filesystem.

The filesystem was created using debootstrap:
   sudo debootstrap buster .uml_rootfs

And change the owner of the root filesystem files
for your user:
   sudo chown -R $USER:$USER .uml_rootfs

For the kunit-tool to correctly capture the test results,
uml_utilities must be installed on the host to halt uml.

Signed-off-by: Vitor Massaru Iha <vitor@...saru.org>
Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
---
v2:
    * splitted patch in 3:
        - Allows to install and load modules in root filesystem;
        - Provides an userspace memory context when tests are compiled
          as module;
        - Convert test_user_copy to KUnit test;
    * added documentation;
    * removed the use of global variable;
    * capitalized make_cmd to look like a constant;
    * adjusted unit tests to the new parameter (--uml_rootfs_dir);
v3:
    * rebased with last kunit branch
    * Please apply this commit from kunit-fixes:
        3f37d14b8a3152441f36b6bc74000996679f0998
---
 Documentation/dev-tools/kunit/start.rst |  15 ++++
 tools/testing/kunit/kunit.py            |  40 +++++++--
 tools/testing/kunit/kunit_kernel.py     | 106 ++++++++++++++++++++----
 tools/testing/kunit/kunit_tool_test.py  |  16 ++--
 4 files changed, 146 insertions(+), 31 deletions(-)

diff --git a/Documentation/dev-tools/kunit/start.rst b/Documentation/dev-tools/kunit/start.rst
index d23385e3e159..3704f8de07a5 100644
--- a/Documentation/dev-tools/kunit/start.rst
+++ b/Documentation/dev-tools/kunit/start.rst
@@ -9,6 +9,21 @@ Installing dependencies
 KUnit has the same dependencies as the Linux kernel. As long as you can build
 the kernel, you can run KUnit.

+Unless you need to run the tests with a root filesystem, in this case you will
+need to install debootsrap and uml_tools (uml-tools in Debian flavor distro).
+
+To install the root filesystem:
+
+.. code-block:: bash
+
+	sudo debootstrap buster .uml_rootfs
+
+And change the owner of the root filesystem for your user:
+
+.. code-block:: bash
+
+	sudo chown -R $USER:$USER .uml_rootfs
+
 Running tests with the KUnit Wrapper
 ====================================
 Included with KUnit is a simple Python wrapper which runs tests under User Mode
diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index 2ece17e9eab5..8abe3a61f798 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -23,16 +23,16 @@ import kunit_parser
 KunitResult = namedtuple('KunitResult', ['status','result','elapsed_time'])

 KunitConfigRequest = namedtuple('KunitConfigRequest',
-				['build_dir', 'make_options'])
+				['build_dir', 'uml_rootfs_path', 'make_options'])
 KunitBuildRequest = namedtuple('KunitBuildRequest',
-			       ['jobs', 'build_dir', 'alltests',
+			       ['jobs', 'build_dir', 'uml_rootfs_path', 'alltests',
 				'make_options'])
 KunitExecRequest = namedtuple('KunitExecRequest',
-			      ['timeout', 'build_dir', 'alltests'])
+			      ['timeout', 'build_dir', 'uml_rootfs_path', 'alltests'])
 KunitParseRequest = namedtuple('KunitParseRequest',
 			       ['raw_output', 'input_data'])
 KunitRequest = namedtuple('KunitRequest', ['raw_output','timeout', 'jobs',
-					   'build_dir', 'alltests',
+					   'build_dir', 'uml_rootfs_path', 'alltests',
 					   'make_options'])

 KernelDirectoryPath = sys.argv[0].split('tools/testing/kunit/')[0]
@@ -47,7 +47,6 @@ def create_default_kunitconfig():
 	if not os.path.exists(kunit_kernel.kunitconfig_path):
 		shutil.copyfile('arch/um/configs/kunit_defconfig',
 				kunit_kernel.kunitconfig_path)
-
 def get_kernel_root_path():
 	parts = sys.argv[0] if not __file__ else __file__
 	parts = os.path.realpath(parts).split('tools/testing/kunit')
@@ -61,7 +60,8 @@ def config_tests(linux: kunit_kernel.LinuxSourceTree,

 	config_start = time.time()
 	create_default_kunitconfig()
-	success = linux.build_reconfig(request.build_dir, request.make_options)
+
+	success = linux.build_reconfig(request.build_dir, request.uml_rootfs_path, request.make_options)
 	config_end = time.time()
 	if not success:
 		return KunitResult(KunitStatus.CONFIG_FAILURE,
@@ -79,10 +79,9 @@ def build_tests(linux: kunit_kernel.LinuxSourceTree,
 	success = linux.build_um_kernel(request.alltests,
 					request.jobs,
 					request.build_dir,
+					request.uml_rootfs_path,
 					request.make_options)
 	build_end = time.time()
-	if not success:
-		return KunitResult(KunitStatus.BUILD_FAILURE, 'could not build kernel')
 	if not success:
 		return KunitResult(KunitStatus.BUILD_FAILURE,
 				   'could not build kernel',
@@ -97,7 +96,8 @@ def exec_tests(linux: kunit_kernel.LinuxSourceTree,
 	test_start = time.time()
 	result = linux.run_kernel(
 		timeout=None if request.alltests else request.timeout,
-		build_dir=request.build_dir)
+		build_dir=request.build_dir,
+		uml_rootfs_path=request.uml_rootfs_path)

 	test_end = time.time()

@@ -130,12 +130,14 @@ def run_tests(linux: kunit_kernel.LinuxSourceTree,
 	run_start = time.time()

 	config_request = KunitConfigRequest(request.build_dir,
+					    request.uml_rootfs_path,
 					    request.make_options)
 	config_result = config_tests(linux, config_request)
 	if config_result.status != KunitStatus.SUCCESS:
 		return config_result

 	build_request = KunitBuildRequest(request.jobs, request.build_dir,
+					  request.uml_rootfs_path,
 					  request.alltests,
 					  request.make_options)
 	build_result = build_tests(linux, build_request)
@@ -143,6 +145,7 @@ def run_tests(linux: kunit_kernel.LinuxSourceTree,
 		return build_result

 	exec_request = KunitExecRequest(request.timeout, request.build_dir,
+					request.uml_rootfs_path,
 					request.alltests)
 	exec_result = exec_tests(linux, exec_request)
 	if exec_result.status != KunitStatus.SUCCESS:
@@ -168,6 +171,10 @@ def add_common_opts(parser):
 			    help='As in the make command, it specifies the build '
 			    'directory.',
                             type=str, default='.kunit', metavar='build_dir')
+	parser.add_argument('--uml_rootfs_dir',
+			    help='To load modules, a root filesystem is '
+			    'required to install and load these modules.',
+                            type=str, default=None, metavar='uml_rootfs_dir')
 	parser.add_argument('--make_options',
 			    help='X=Y make option, can be repeated.',
 			    action='append')
@@ -196,6 +203,7 @@ def add_parse_opts(parser):


 def main(argv, linux=None):
+	uml_rootfs_path = None
 	parser = argparse.ArgumentParser(
 			description='Helps writing and running KUnit tests.')
 	subparser = parser.add_subparsers(dest='subcommand')
@@ -235,6 +243,16 @@ def main(argv, linux=None):

 	cli_args = parser.parse_args(argv)

+	if cli_args.uml_rootfs_dir \
+			and os.path.exists(cli_args.uml_rootfs_dir) \
+			and os.path.abspath(cli_args.uml_rootfs_dir) != \
+				os.path.abspath(os.getcwd()) \
+			and os.path.abspath(cli_args.uml_rootfs_dir) != '/':
+		uml_rootfs_path = os.path.abspath(cli_args.uml_rootfs_dir)
+	elif cli_args.uml_rootfs_dir != None:
+		print("Invalid uml_rootfs_dir: {}".format(cli_args.uml_rootfs_dir))
+		sys.exit(1)
+
 	if cli_args.subcommand == 'run':
 		if not os.path.exists(cli_args.build_dir):
 			os.mkdir(cli_args.build_dir)
@@ -246,6 +264,7 @@ def main(argv, linux=None):
 				       cli_args.timeout,
 				       cli_args.jobs,
 				       cli_args.build_dir,
+				       uml_rootfs_path,
 				       cli_args.alltests,
 				       cli_args.make_options)
 		result = run_tests(linux, request)
@@ -260,6 +279,7 @@ def main(argv, linux=None):
 			linux = kunit_kernel.LinuxSourceTree()

 		request = KunitConfigRequest(cli_args.build_dir,
+					     uml_rootfs_path,
 					     cli_args.make_options)
 		result = config_tests(linux, request)
 		kunit_parser.print_with_timestamp((
@@ -277,6 +297,7 @@ def main(argv, linux=None):

 		request = KunitBuildRequest(cli_args.jobs,
 					    cli_args.build_dir,
+					    uml_rootfs_path,
 					    cli_args.alltests,
 					    cli_args.make_options)
 		result = build_tests(linux, request)
@@ -295,6 +316,7 @@ def main(argv, linux=None):

 		exec_request = KunitExecRequest(cli_args.timeout,
 						cli_args.build_dir,
+						uml_rootfs_path,
 						cli_args.alltests)
 		exec_result = exec_tests(linux, exec_request)
 		parse_request = KunitParseRequest(cli_args.raw_output,
diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
index e20e2056cb38..0f21f7e879ed 100644
--- a/tools/testing/kunit/kunit_kernel.py
+++ b/tools/testing/kunit/kunit_kernel.py
@@ -11,6 +11,7 @@ import logging
 import subprocess
 import os
 import signal
+import time

 from contextlib import ExitStack

@@ -19,8 +20,58 @@ import kunit_parser

 KCONFIG_PATH = '.config'
 kunitconfig_path = '.kunitconfig'
+X86_64_DEFCONFIG_PATH = 'arch/um/configs/x86_64_defconfig'
 BROKEN_ALLCONFIG_PATH = 'tools/testing/kunit/configs/broken_on_uml.config'

+MAKE_CMD = {
+	'make': {
+		'command': ['make', 'ARCH=um'],
+		'msg_error': 'Could not call execute make: ',
+	},
+	'make_modules': {
+		'command': ['make', 'modules', 'ARCH=um'],
+		'msg_error': 'Could not call execute make modules: ',
+	},
+	'make_modules_install': {
+		'command': ['make', 'modules_install', 'ARCH=um'],
+		'msg_error': 'Could not call execute make modules_install: ',
+	}
+}
+
+def halt_uml():
+	try:
+		subprocess.call(['uml_mconsole', 'kunitid', 'halt'])
+	except OSError as e:
+		raise ConfigError('Could not call uml_mconsole ' + e)
+	except subprocess.CalledProcessError as e:
+			raise ConfigError(e.output)
+
+def enable_uml_modules_on_boot(output_command, uml_rootfs_path):
+	uml_modules_path = None
+	found_kernel_version = False
+	modules = []
+	for i in output_command.decode('utf-8').split():
+		if found_kernel_version:
+			kernel_version = i
+			uml_modules_path = os.path.join(uml_rootfs_path,
+			      'lib/modules/', kernel_version, 'kernel/lib/')
+			break
+		if 'DEPMOD' in i:
+			found_kernel_version = True
+
+	try:
+		if os.path.exists(uml_modules_path):
+			modules = subprocess.check_output(['ls',
+					    uml_modules_path]).decode('utf-8').split()
+	except OSError as e:
+		raise ConfigError('Could not list directory ' + e)
+	except subprocess.CalledProcessError as e:
+			raise ConfigError(e.output)
+
+	with open(os.path.join(uml_rootfs_path, 'etc/modules'), 'w') as f:
+		for i in modules:
+			f.write(i.replace('.ko', ''))
+
 class ConfigError(Exception):
 	"""Represents an error trying to configure the Linux kernel."""

@@ -70,20 +121,28 @@ class LinuxSourceTreeOperations(object):
 		kunit_parser.print_with_timestamp(
 			'Starting Kernel with all configs takes a few minutes...')

-	def make(self, jobs, build_dir, make_options):
-		command = ['make', 'ARCH=um', '--jobs=' + str(jobs)]
+	def make(self, cmd, jobs, build_dir, uml_rootfs_path, make_options):
+		command = MAKE_CMD[cmd]['command'] + ['--jobs=' + str(jobs)]
+
 		if make_options:
 			command.extend(make_options)
 		if build_dir:
 			command += ['O=' + build_dir]
+
+		if cmd == 'make_modules_install':
+			command += ['INSTALL_MOD_PATH=' + uml_rootfs_path]
+
 		try:
-			subprocess.check_output(command, stderr=subprocess.STDOUT)
+			output = subprocess.check_output(command, stderr=subprocess.STDOUT)
+			if cmd == 'make_modules_install':
+				 enable_uml_modules_on_boot(output,
+							    uml_rootfs_path)
 		except OSError as e:
-			raise BuildError('Could not call execute make: ' + e)
+			raise BuildError(MAKE_CMD[cmd]['msg_error'] + e)
 		except subprocess.CalledProcessError as e:
 			raise BuildError(e.output)

-	def linux_bin(self, params, timeout, build_dir, outfile):
+	def linux_bin(self, params, timeout, build_dir, uml_rootfs_path, outfile):
 		"""Runs the Linux UML binary. Must be named 'linux'."""
 		linux_bin = './linux'
 		if build_dir:
@@ -92,7 +151,11 @@ class LinuxSourceTreeOperations(object):
 			process = subprocess.Popen([linux_bin] + params,
 						   stdout=output,
 						   stderr=subprocess.STDOUT)
-			process.wait(timeout)
+			if uml_rootfs_path:
+				time.sleep(timeout)
+				halt_uml()
+			else:
+				process.wait(timeout)


 def get_kconfig_path(build_dir):
@@ -132,11 +195,16 @@ class LinuxSourceTree(object):
 			return False
 		return True

-	def build_config(self, build_dir, make_options):
+	def build_config(self, build_dir, uml_rootfs_path, make_options):
 		kconfig_path = get_kconfig_path(build_dir)
 		if build_dir and not os.path.exists(build_dir):
 			os.mkdir(build_dir)
 		self._kconfig.write_to_file(kconfig_path)
+
+		if uml_rootfs_path:
+			with open(kconfig_path, 'a') as fw:
+				with open(X86_64_DEFCONFIG_PATH, 'r') as fr:
+					fw.write(fr.read())
 		try:
 			self._ops.make_olddefconfig(build_dir, make_options)
 		except ConfigError as e:
@@ -144,7 +212,7 @@ class LinuxSourceTree(object):
 			return False
 		return self.validate_config(build_dir)

-	def build_reconfig(self, build_dir, make_options):
+	def build_reconfig(self, build_dir, uml_rootfs_path, make_options):
 		"""Creates a new .config if it is not a subset of the .kunitconfig."""
 		kconfig_path = get_kconfig_path(build_dir)
 		if os.path.exists(kconfig_path):
@@ -153,28 +221,38 @@ class LinuxSourceTree(object):
 			if not self._kconfig.is_subset_of(existing_kconfig):
 				print('Regenerating .config ...')
 				os.remove(kconfig_path)
-				return self.build_config(build_dir, make_options)
+				return self.build_config(build_dir, uml_rootfs_path,
+							 make_options)
 			else:
 				return True
 		else:
 			print('Generating .config ...')
-			return self.build_config(build_dir, make_options)
+			return self.build_config(build_dir, uml_rootfs_path, make_options)

-	def build_um_kernel(self, alltests, jobs, build_dir, make_options):
+	def build_um_kernel(self, alltests, jobs, build_dir,
+			    uml_rootfs_path, make_options):
 		if alltests:
 			self._ops.make_allyesconfig()
 		try:
 			self._ops.make_olddefconfig(build_dir, make_options)
-			self._ops.make(jobs, build_dir, make_options)
+			self._ops.make('make', jobs, build_dir, uml_rootfs_path, make_options)
+			if uml_rootfs_path:
+				self._ops.make('make_modules', jobs, build_dir,
+						uml_rootfs_path, make_options)
+				self._ops.make('make_modules_install', jobs,
+						build_dir, uml_rootfs_path, make_options)
 		except (ConfigError, BuildError) as e:
 			logging.error(e)
 			return False
 		return self.validate_config(build_dir)

-	def run_kernel(self, args=[], build_dir='', timeout=None):
+	def run_kernel(self, args=[], build_dir='', uml_rootfs_path=None, timeout=None):
 		args.extend(['mem=1G'])
+		if uml_rootfs_path:
+			args.extend(['root=/dev/root', 'rootfstype=hostfs',
+				     'rootflags=' + uml_rootfs_path, 'umid=kunitid'])
 		outfile = 'test.log'
-		self._ops.linux_bin(args, timeout, build_dir, outfile)
+		self._ops.linux_bin(args, timeout, build_dir, uml_rootfs_path, outfile)
 		subprocess.call(['stty', 'sane'])
 		with open(outfile, 'r') as file:
 			for line in file:
diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
index ebedfc57a39b..2359c77c8efb 100755
--- a/tools/testing/kunit/kunit_tool_test.py
+++ b/tools/testing/kunit/kunit_tool_test.py
@@ -247,14 +247,14 @@ class KUnitMainTest(unittest.TestCase):
 	def test_build_passes_args_pass(self):
 		kunit.main(['build'], self.linux_source_mock)
 		assert self.linux_source_mock.build_reconfig.call_count == 0
-		self.linux_source_mock.build_um_kernel.assert_called_once_with(False, 8, '.kunit', None)
+		self.linux_source_mock.build_um_kernel.assert_called_once_with(False, 8, '.kunit', None, None)
 		assert self.linux_source_mock.run_kernel.call_count == 0

 	def test_exec_passes_args_pass(self):
 		kunit.main(['exec'], self.linux_source_mock)
 		assert self.linux_source_mock.build_reconfig.call_count == 0
 		assert self.linux_source_mock.run_kernel.call_count == 1
-		self.linux_source_mock.run_kernel.assert_called_once_with(build_dir='.kunit', timeout=300)
+		self.linux_source_mock.run_kernel.assert_called_once_with(build_dir='.kunit', uml_rootfs_path=None, timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))

 	def test_run_passes_args_pass(self):
@@ -262,7 +262,7 @@ class KUnitMainTest(unittest.TestCase):
 		assert self.linux_source_mock.build_reconfig.call_count == 1
 		assert self.linux_source_mock.run_kernel.call_count == 1
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir='.kunit', timeout=300)
+			build_dir='.kunit', uml_rootfs_path=None, timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))

 	def test_exec_passes_args_fail(self):
@@ -302,7 +302,7 @@ class KUnitMainTest(unittest.TestCase):
 	def test_exec_timeout(self):
 		timeout = 3453
 		kunit.main(['exec', '--timeout', str(timeout)], self.linux_source_mock)
-		self.linux_source_mock.run_kernel.assert_called_once_with(build_dir='.kunit', timeout=timeout)
+		self.linux_source_mock.run_kernel.assert_called_once_with(build_dir='.kunit', uml_rootfs_path=None, timeout=timeout)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))

 	def test_run_timeout(self):
@@ -310,7 +310,7 @@ class KUnitMainTest(unittest.TestCase):
 		kunit.main(['run', '--timeout', str(timeout)], self.linux_source_mock)
 		assert self.linux_source_mock.build_reconfig.call_count == 1
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir='.kunit', timeout=timeout)
+			build_dir='.kunit', uml_rootfs_path=None, timeout=timeout)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))

 	def test_run_builddir(self):
@@ -318,7 +318,7 @@ class KUnitMainTest(unittest.TestCase):
 		kunit.main(['run', '--build_dir=.kunit'], self.linux_source_mock)
 		assert self.linux_source_mock.build_reconfig.call_count == 1
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir=build_dir, timeout=300)
+			build_dir=build_dir, uml_rootfs_path=None, timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))

 	def test_config_builddir(self):
@@ -329,12 +329,12 @@ class KUnitMainTest(unittest.TestCase):
 	def test_build_builddir(self):
 		build_dir = '.kunit'
 		kunit.main(['build', '--build_dir', build_dir], self.linux_source_mock)
-		self.linux_source_mock.build_um_kernel.assert_called_once_with(False, 8, build_dir, None)
+		self.linux_source_mock.build_um_kernel.assert_called_once_with(False, 8, build_dir, None, None)

 	def test_exec_builddir(self):
 		build_dir = '.kunit'
 		kunit.main(['exec', '--build_dir', build_dir], self.linux_source_mock)
-		self.linux_source_mock.run_kernel.assert_called_once_with(build_dir=build_dir, timeout=300)
+		self.linux_source_mock.run_kernel.assert_called_once_with(build_dir=build_dir, uml_rootfs_path=None, timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))

 if __name__ == '__main__':

base-commit: d43c7fb05765152d4d4a39a8ef957c4ea14d8847
--
2.26.2

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