tests/functional: Convert the hotplug_cpu avocado test

Since we don't have ssh support in the functional test framework yet,
simply use the serial console for this test instead. It's also
sufficient to only boot into an initrd here, no need to fire up a
full-blown guest, so the test now finishes much faster.

While we're at it, also unplug the CPU now and check that it is gone
in the guest.

Message-ID: <20241217142020.155776-1-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

3 files changed, 70 insertions, 37 deletions

diff --git a/tests/avocado/hotplug_cpu.py b/tests/avocado/hotplug_cpu.py
deleted file mode 100644
index 342c838539..0000000000
--- a/tests/avocado/hotplug_cpu.py
+++ /dev/null
@@ -1,37 +0,0 @@
-# Functional test that hotplugs a CPU and checks it on a Linux guest
-#
-# Copyright (c) 2021 Red Hat, Inc.
-#
-# Author:
-#  Cleber Rosa <crosa@redhat.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.
-
-from avocado_qemu.linuxtest import LinuxTest
-
-
-class HotPlugCPU(LinuxTest):
-
-    def test(self):
-        """
-        :avocado: tags=arch:x86_64
-        :avocado: tags=machine:q35
-        :avocado: tags=accel:kvm
-        """
-        self.require_accelerator('kvm')
-        self.vm.add_args('-accel', 'kvm')
-        self.vm.add_args('-cpu', 'Haswell')
-        self.vm.add_args('-smp', '1,sockets=1,cores=2,threads=1,maxcpus=2')
-        self.launch_and_wait()
-
-        self.ssh_command('test -e /sys/devices/system/cpu/cpu0')
-        with self.assertRaises(AssertionError):
-            self.ssh_command('test -e /sys/devices/system/cpu/cpu1')
-
-        self.vm.cmd('device_add',
-                    driver='Haswell-x86_64-cpu',
-                    socket_id=0,
-                    core_id=1,
-                    thread_id=0)
-        self.ssh_command('test -e /sys/devices/system/cpu/cpu1')
diff --git a/tests/functional/meson.build b/tests/functional/meson.build
index d03fe0ca36..24f7f8f2f1 100644
--- a/tests/functional/meson.build
+++ b/tests/functional/meson.build
@@ -233,6 +233,7 @@ tests_x86_64_system_thorough = [
   'multiprocess',
   'netdev_ethtool',
   'virtio_gpu',
+  'x86_64_hotplug_cpu',
   'x86_64_tuxrun',
 ]
 
diff --git a/tests/functional/test_x86_64_hotplug_cpu.py b/tests/functional/test_x86_64_hotplug_cpu.py
new file mode 100755
index 0000000000..b1d5156c72
--- /dev/null
+++ b/tests/functional/test_x86_64_hotplug_cpu.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+#
+# Functional test that hotplugs a CPU and checks it on a Linux guest
+#
+# Copyright (c) 2021 Red Hat, Inc.
+#
+# Author:
+#  Cleber Rosa <crosa@redhat.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.
+
+from qemu_test import LinuxKernelTest, Asset, exec_command_and_wait_for_pattern
+
+
+class HotPlugCPU(LinuxKernelTest):
+
+    ASSET_KERNEL = Asset(
+        ('https://archives.fedoraproject.org/pub/archive/fedora/linux/releases'
+         '/31/Server/x86_64/os/images/pxeboot/vmlinuz'),
+        'd4738d03dbbe083ca610d0821d0a8f1488bebbdccef54ce33e3adb35fda00129')
+
+    ASSET_INITRD = Asset(
+        ('https://archives.fedoraproject.org/pub/archive/fedora/linux/releases'
+         '/31/Server/x86_64/os/images/pxeboot/initrd.img'),
+        '277cd6c7adf77c7e63d73bbb2cded8ef9e2d3a2f100000e92ff1f8396513cd8b')
+
+    def test_hotplug(self):
+
+        self.require_accelerator('kvm')
+        self.vm.add_args('-accel', 'kvm')
+        self.vm.add_args('-cpu', 'Haswell')
+        self.vm.add_args('-smp', '1,sockets=1,cores=2,threads=1,maxcpus=2')
+        self.vm.add_args('-m', '1G')
+        self.vm.add_args('-append', 'console=ttyS0 rd.rescue')
+
+        self.launch_kernel(self.ASSET_KERNEL.fetch(),
+                           self.ASSET_INITRD.fetch(),
+                           wait_for='Entering emergency mode.')
+        prompt = '# '
+        self.wait_for_console_pattern(prompt)
+
+        exec_command_and_wait_for_pattern(self,
+                                          'cd /sys/devices/system/cpu/cpu0',
+                                          'cpu0#')
+        exec_command_and_wait_for_pattern(self,
+                                          'cd /sys/devices/system/cpu/cpu1',
+                                          'No such file or directory')
+
+        self.vm.cmd('device_add',
+                    driver='Haswell-x86_64-cpu',
+                    id='c1',
+                    socket_id=0,
+                    core_id=1,
+                    thread_id=0)
+        self.wait_for_console_pattern('CPU1 has been hot-added')
+
+        exec_command_and_wait_for_pattern(self,
+                                          'cd /sys/devices/system/cpu/cpu1',
+                                          'cpu1#')
+
+        self.vm.cmd('device_del', id='c1')
+
+        exec_command_and_wait_for_pattern(self,
+                                          'cd /sys/devices/system/cpu/cpu1',
+                                          'No such file or directory')
+
+if __name__ == '__main__':
+    LinuxKernelTest.main()