[PATCH] tests/functional: Convert the hotplug_cpu avocado test

[Thomas Huth]

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.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 MAINTAINERS                                   |  1 +
 tests/functional/meson.build                  |  1 +
 .../test_x86_64_hotplug_cpu.py}               | 58 ++++++++++++++-----
 3 files changed, 47 insertions(+), 13 deletions(-)
 rename tests/{avocado/hotplug_cpu.py => functional/test_x86_64_hotplug_cpu.py} 
(25%)
 mode change 100644 => 100755

diff --git a/MAINTAINERS b/MAINTAINERS
index 822f34344b..878409c121 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -476,6 +476,7 @@ F: docs/system/i386/sgx.rst
 F: target/i386/kvm/
 F: target/i386/sev*
 F: scripts/kvm/vmxcap
+F: tests/functional/test_x86_64_hotplug_cpu.py
 
 Xen emulation on X86 KVM CPUs
 M: David Woodhouse <dwmw2@infradead.org>
diff --git a/tests/functional/meson.build b/tests/functional/meson.build
index 1bc5ba5229..04f8b858ed 100644
--- a/tests/functional/meson.build
+++ b/tests/functional/meson.build
@@ -229,6 +229,7 @@ tests_x86_64_system_thorough = [
   'multiprocess',
   'netdev_ethtool',
   'virtio_gpu',
+  'x86_64_hotplug_cpu',
 ]
 
 tests_xtensa_system_thorough = [
diff --git a/tests/avocado/hotplug_cpu.py 
b/tests/functional/test_x86_64_hotplug_cpu.py
old mode 100644
new mode 100755
similarity index 25%
rename from tests/avocado/hotplug_cpu.py
rename to tests/functional/test_x86_64_hotplug_cpu.py
index 342c838539..b1d5156c72
--- a/tests/avocado/hotplug_cpu.py
+++ b/tests/functional/test_x86_64_hotplug_cpu.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+#
 # Functional test that hotplugs a CPU and checks it on a Linux guest
 #
 # Copyright (c) 2021 Red Hat, Inc.
@@ -8,30 +10,60 @@
 # 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
+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')
 
-class HotPlugCPU(LinuxTest):
+    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):
 
-    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.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)
 
-        self.ssh_command('test -e /sys/devices/system/cpu/cpu0')
-        with self.assertRaises(AssertionError):
-            self.ssh_command('test -e /sys/devices/system/cpu/cpu1')
+        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.ssh_command('test -e /sys/devices/system/cpu/cpu1')
+        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()
-- 
2.47.1