tests/avocado: s390x cpu topology core

Introduction of the s390x cpu topology core functions and
basic tests.

We test the correlation between the command line and
the QMP results in query-cpus-fast for various CPU topology.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Co-developed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Message-ID: <20231016183925.2384704-16-nsg@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 200 insertions, 0 deletions

diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
new file mode 100644
index 0000000..9078b45
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+++ b/tests/avocado/s390_topology.py
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+# Functional test that boots a Linux kernel and checks the console
+#
+# Copyright IBM Corp. 2023
+#
+# Author:
+#  Pierre Morel <pmorel@linux.ibm.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later.  See the COPYING file in the top-level directory.
+
+import os
+import shutil
+import time
+
+from avocado_qemu import QemuSystemTest
+from avocado_qemu import exec_command
+from avocado_qemu import exec_command_and_wait_for_pattern
+from avocado_qemu import interrupt_interactive_console_until_pattern
+from avocado_qemu import wait_for_console_pattern
+from avocado.utils import process
+from avocado.utils import archive
+
+
+class S390CPUTopology(QemuSystemTest):
+    """
+    S390x CPU topology consists of 4 topology layers, from bottom to top,
+    the cores, sockets, books and drawers and 2 modifiers attributes,
+    the entitlement and the dedication.
+    See: docs/system/s390x/cpu-topology.rst.
+
+    S390x CPU topology is setup in different ways:
+    - implicitly from the '-smp' argument by completing each topology
+      level one after the other beginning with drawer 0, book 0 and
+      socket 0.
+    - explicitly from the '-device' argument on the QEMU command line
+    - explicitly by hotplug of a new CPU using QMP or HMP
+    - it is modified by using QMP 'set-cpu-topology'
+
+    The S390x modifier attribute entitlement depends on the machine
+    polarization, which can be horizontal or vertical.
+    The polarization is changed on a request from the guest.
+    """
+    timeout = 90
+
+    KERNEL_COMMON_COMMAND_LINE = ('printk.time=0 '
+                                  'root=/dev/ram '
+                                  'selinux=0 '
+                                  'rdinit=/bin/sh')
+
+    def wait_until_booted(self):
+        wait_for_console_pattern(self, 'no job control',
+                                 failure_message='Kernel panic - not syncing',
+                                 vm=None)
+
+    def check_topology(self, c, s, b, d, e, t):
+        res = self.vm.qmp('query-cpus-fast')
+        cpus =  res['return']
+        for cpu in cpus:
+            core = cpu['props']['core-id']
+            socket = cpu['props']['socket-id']
+            book = cpu['props']['book-id']
+            drawer = cpu['props']['drawer-id']
+            entitlement = cpu.get('entitlement')
+            dedicated = cpu.get('dedicated')
+            if core == c:
+                self.assertEqual(drawer, d)
+                self.assertEqual(book, b)
+                self.assertEqual(socket, s)
+                self.assertEqual(entitlement, e)
+                self.assertEqual(dedicated, t)
+
+    def kernel_init(self):
+        """
+        We need a VM that supports CPU topology,
+        currently this only the case when using KVM, not TCG.
+        We need a kernel supporting the CPU topology.
+        We need a minimal root filesystem with a shell.
+        """
+        self.require_accelerator("kvm")
+        kernel_url = ('https://archives.fedoraproject.org/pub/archive'
+                      '/fedora-secondary/releases/35/Server/s390x/os'
+                      '/images/kernel.img')
+        kernel_hash = '0d1aaaf303f07cf0160c8c48e56fe638'
+        kernel_path = self.fetch_asset(kernel_url, algorithm='md5',
+                                       asset_hash=kernel_hash)
+
+        initrd_url = ('https://archives.fedoraproject.org/pub/archive'
+                      '/fedora-secondary/releases/35/Server/s390x/os'
+                      '/images/initrd.img')
+        initrd_hash = 'a122057d95725ac030e2ec51df46e172'
+        initrd_path_xz = self.fetch_asset(initrd_url, algorithm='md5',
+                                          asset_hash=initrd_hash)
+        initrd_path = os.path.join(self.workdir, 'initrd-raw.img')
+        archive.lzma_uncompress(initrd_path_xz, initrd_path)
+
+        self.vm.set_console()
+        kernel_command_line = self.KERNEL_COMMON_COMMAND_LINE
+        self.vm.add_args('-nographic',
+                         '-enable-kvm',
+                         '-cpu', 'max,ctop=on',
+                         '-m', '512',
+                         '-kernel', kernel_path,
+                         '-initrd', initrd_path,
+                         '-append', kernel_command_line)
+
+    def test_single(self):
+        """
+        This test checks the simplest topology with a single CPU.
+
+        :avocado: tags=arch:s390x
+        :avocado: tags=machine:s390-ccw-virtio
+        """
+        self.kernel_init()
+        self.vm.launch()
+        self.wait_until_booted()
+        self.check_topology(0, 0, 0, 0, 'medium', False)
+
+    def test_default(self):
+        """
+        This test checks the implicit topology.
+
+        :avocado: tags=arch:s390x
+        :avocado: tags=machine:s390-ccw-virtio
+        """
+        self.kernel_init()
+        self.vm.add_args('-smp',
+                         '13,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+        self.vm.launch()
+        self.wait_until_booted()
+        self.check_topology(0, 0, 0, 0, 'medium', False)
+        self.check_topology(1, 0, 0, 0, 'medium', False)
+        self.check_topology(2, 1, 0, 0, 'medium', False)
+        self.check_topology(3, 1, 0, 0, 'medium', False)
+        self.check_topology(4, 2, 0, 0, 'medium', False)
+        self.check_topology(5, 2, 0, 0, 'medium', False)
+        self.check_topology(6, 0, 1, 0, 'medium', False)
+        self.check_topology(7, 0, 1, 0, 'medium', False)
+        self.check_topology(8, 1, 1, 0, 'medium', False)
+        self.check_topology(9, 1, 1, 0, 'medium', False)
+        self.check_topology(10, 2, 1, 0, 'medium', False)
+        self.check_topology(11, 2, 1, 0, 'medium', False)
+        self.check_topology(12, 0, 0, 1, 'medium', False)
+
+    def test_move(self):
+        """
+        This test checks the topology modification by moving a CPU
+        to another socket: CPU 0 is moved from socket 0 to socket 2.
+
+        :avocado: tags=arch:s390x
+        :avocado: tags=machine:s390-ccw-virtio
+        """
+        self.kernel_init()
+        self.vm.add_args('-smp',
+                         '1,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+        self.vm.launch()
+        self.wait_until_booted()
+
+        self.check_topology(0, 0, 0, 0, 'medium', False)
+        res = self.vm.qmp('set-cpu-topology',
+                          {'core-id': 0, 'socket-id': 2, 'entitlement': 'low'})
+        self.assertEqual(res['return'], {})
+        self.check_topology(0, 2, 0, 0, 'low', False)
+
+    def test_dash_device(self):
+        """
+        This test verifies that a CPU defined with the '-device'
+        command line option finds its right place inside the topology.
+
+        :avocado: tags=arch:s390x
+        :avocado: tags=machine:s390-ccw-virtio
+        """
+        self.kernel_init()
+        self.vm.add_args('-smp',
+                         '1,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+        self.vm.add_args('-device', 'max-s390x-cpu,core-id=10')
+        self.vm.add_args('-device',
+                         'max-s390x-cpu,'
+                         'core-id=1,socket-id=0,book-id=1,drawer-id=1,entitlement=low')
+        self.vm.add_args('-device',
+                         'max-s390x-cpu,'
+                         'core-id=2,socket-id=0,book-id=1,drawer-id=1,entitlement=medium')
+        self.vm.add_args('-device',
+                         'max-s390x-cpu,'
+                         'core-id=3,socket-id=1,book-id=1,drawer-id=1,entitlement=high')
+        self.vm.add_args('-device',
+                         'max-s390x-cpu,'
+                         'core-id=4,socket-id=1,book-id=1,drawer-id=1')
+        self.vm.add_args('-device',
+                         'max-s390x-cpu,'
+                         'core-id=5,socket-id=2,book-id=1,drawer-id=1,dedicated=true')
+
+        self.vm.launch()
+        self.wait_until_booted()
+
+        self.check_topology(10, 2, 1, 0, 'medium', False)
+        self.check_topology(1, 0, 1, 1, 'low', False)
+        self.check_topology(2, 0, 1, 1, 'medium', False)
+        self.check_topology(3, 1, 1, 1, 'high', False)
+        self.check_topology(4, 1, 1, 1, 'medium', False)
+        self.check_topology(5, 2, 1, 1, 'high', True)