[PATCH v2] tests/functional: add hypervisor test for aarch64

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

From: Alex Bennée <alex.bennee@linaro.org>

This is a simple test case that runs an image with kvmtool and
kvm-unit-tests which can validate virtualisation works. This is useful
for exercising TCG but can also be applied to any nested virt setup
which is why it doesn't specify an accelerator.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250721153326.783646-1-alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
v2: Addressed Manos review comments
---
 tests/functional/meson.build         |  1 +
 tests/functional/test_aarch64_kvm.py | 80 ++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100755 tests/functional/test_aarch64_kvm.py

diff --git a/tests/functional/meson.build b/tests/functional/meson.build
index 7699af9e2d2..2f7bc4ed65c 100644
--- a/tests/functional/meson.build
+++ b/tests/functional/meson.build
@@ -89,6 +89,7 @@ tests_aarch64_system_thorough = [
   'aarch64_device_passthrough',
   'aarch64_hotplug_pci',
   'aarch64_imx8mp_evk',
+  'aarch64_kvm',
   'aarch64_raspi3',
   'aarch64_raspi4',
   'aarch64_replay',
diff --git a/tests/functional/test_aarch64_kvm.py b/tests/functional/test_aarch64_kvm.py
new file mode 100755
index 00000000000..add89c58c5e
--- /dev/null
+++ b/tests/functional/test_aarch64_kvm.py
@@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+#
+# Functional test that runs subsets of kvm-unit-tests on Aarch64.
+# These can run on TCG and any accelerator supporting nested
+# virtualisation.
+#
+# Copyright (c) 2025 Linaro
+#
+# Author:
+#  Alex Bennée <alex.bennee@linaro.org>
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+from qemu.machine.machine import VMLaunchFailure
+
+from qemu_test import Asset
+from qemu_test import exec_command_and_wait_for_pattern as ec_and_wait
+from qemu_test.linuxkernel import LinuxKernelTest
+
+
+class Aarch64VirtKVMTests(LinuxKernelTest):
+
+    ASSET_KVM_TEST_KERNEL = Asset(
+        'https://fileserver.linaro.org/s/HmjaxXXYHYSqbes/'
+        'download?path=%2F&files='
+        'image-with-kvm-tool-and-unit-tests.gz',
+        '34de4aaea90db5da42729e7d28b77f392c37a2f4da859f889a5234aaf0970696')
+
+    # make it easier to detect successful return to shell
+    PS1 = 'RES=[$?] # '
+    OK_CMD = 'RES=[0] # '
+
+    # base of tests
+    KUT_BASE = '/usr/share/kvm-unit-tests/'
+
+    def _launch_guest(self, kvm_mode):
+
+        self.set_machine('virt')
+        kernel_path = self.ASSET_KVM_TEST_KERNEL.fetch()
+
+        self.vm.set_console()
+        kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
+                               f'console=ttyAMA0 kvm-arm.mode={kvm_mode}')
+
+        self.vm.add_args('-accel', 'tcg')
+        self.vm.add_args('-cpu', 'cortex-a72')
+        self.vm.add_args('-machine', 'virt,gic-version=3,virtualization=on',
+                         '-kernel', kernel_path,
+                         '-append', kernel_command_line)
+        self.vm.add_args('-smp', '2', '-m', '320')
+
+        try:
+            self.vm.launch()
+        except VMLaunchFailure as excp:
+            self.log.info('unhandled launch failure: %s', excp.output)
+            raise excp
+
+        self.wait_for_console_pattern('buildroot login:')
+        ec_and_wait(self, 'root', '#')
+        ec_and_wait(self, f'export PS1="{self.PS1}"', self.OK_CMD)
+
+    def _run_kut(self, kvm_mode):
+        ec_and_wait(self, f'{self.KUT_BASE}/selftest-setup', self.OK_CMD)
+        ec_and_wait(self, f'{self.KUT_BASE}/selftest-vectors-kernel', self.OK_CMD)
+        ec_and_wait(self, f'{self.KUT_BASE}/selftest-vectors-user', self.OK_CMD)
+        ec_and_wait(self, f'{self.KUT_BASE}/selftest-smp', self.OK_CMD)
+
+    def do_test(self, kvm_mode='nvhe', accel='tcg'):
+        self.require_accelerator(accel)
+        self._launch_guest(kvm_mode)
+        self._run_kut(kvm_mode)
+
+    def test_aarch64_vhe_selftest_tcg(self):
+        self.do_test('vhe')
+
+    def test_aarch64_nvhe_selftest_tcg(self):
+        self.do_test('nvhe')
+
+if __name__ == '__main__':
+    LinuxKernelTest.main()
-- 
2.49.0