linux-kernel - [PATCH 1/2] kunit: tool: Add x86_64-smp architecture for SMP testing

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Message-Id: <20220518073232.526443-1-davidgow@google.com>
Date:   Wed, 18 May 2022 15:32:31 +0800
From:   David Gow <davidgow@...gle.com>
To:     Brendan Higgins <brendanhiggins@...gle.com>,
        Daniel Latypov <dlatypov@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Cc:     David Gow <davidgow@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, kunit-dev@...glegroups.com,
        kasan-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] kunit: tool: Add x86_64-smp architecture for SMP testing

Add a new QEMU config for kunit_tool, x86_64-smp, which provides an
8-cpu SMP setup. No other kunit_tool configurations provide an SMP
setup, so this is the best bet for testing things like KCSAN, which
require a multicore/multi-cpu system.

The choice of 8 CPUs is pretty arbitrary: it's enough to get tests like
KCSAN to run with a nontrivial number of worker threads, while still
working relatively quickly on older machines.

Signed-off-by: David Gow <davidgow@...gle.com>
---

This is based off the discussion in:
https://groups.google.com/g/kasan-dev/c/A7XzC2pXRC8

---
 tools/testing/kunit/qemu_configs/x86_64-smp.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 tools/testing/kunit/qemu_configs/x86_64-smp.py

diff --git a/tools/testing/kunit/qemu_configs/x86_64-smp.py b/tools/testing/kunit/qemu_configs/x86_64-smp.py
new file mode 100644
index 000000000000..a95623f5f8b7
--- /dev/null
+++ b/tools/testing/kunit/qemu_configs/x86_64-smp.py
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+from ..qemu_config import QemuArchParams
+
+QEMU_ARCH = QemuArchParams(linux_arch='x86_64',
+			   kconfig='''
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SMP=y
+			   ''',
+			   qemu_arch='x86_64',
+			   kernel_path='arch/x86/boot/bzImage',
+			   kernel_command_line='console=ttyS0',
+			   extra_qemu_params=['-smp', '8'])
-- 
2.36.0.550.gb090851708-goog