[PATCH v2] tests/acceptance: add a test for devices on s390x

[Cornelia Huck <cohuck@redhat.com>]

This adds a very basic test for checking that we present devices
in a way that Linux can consume: boot with both virtio-net-ccw and
virtio-net-pci attached and then verify that Linux is able to see
and detect these devices.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
---
RFC->v2:
 - use a newer kernel that uses the uid in zpci address generation
 - add a zpci device to specify a uid
 - increase timeout
 - tweak naming
 - add a MAINTAINERS entry
---
 MAINTAINERS                                 |  1 +
 tests/acceptance/machine_s390_ccw_virtio.py | 70 +++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 tests/acceptance/machine_s390_ccw_virtio.py

diff --git a/MAINTAINERS b/MAINTAINERS
index 68bc160f41bc..cc1c7c2ffed8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1426,6 +1426,7 @@ F: include/hw/s390x/
 F: hw/watchdog/wdt_diag288.c
 F: include/hw/watchdog/wdt_diag288.h
 F: default-configs/s390x-softmmu.mak
+F: tests/acceptance/machine_s390_ccw_virtio.py
 T: git https://github.com/cohuck/qemu.git s390-next
 T: git https://github.com/borntraeger/qemu.git s390-next
 L: qemu-s390x@nongnu.org
diff --git a/tests/acceptance/machine_s390_ccw_virtio.py b/tests/acceptance/machine_s390_ccw_virtio.py
new file mode 100644
index 000000000000..1f56be776c5f
--- /dev/null
+++ b/tests/acceptance/machine_s390_ccw_virtio.py
@@ -0,0 +1,70 @@
+# Functional test that boots an s390x Linux guest with ccw and PCI devices
+# attached and checks whether the devices are recognized by Linux
+#
+# Copyright (c) 2020 Red Hat, Inc.
+#
+# Author:
+#  Cornelia Huck <cohuck@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.
+
+
+import os
+
+from avocado_qemu import Test
+from avocado_qemu import exec_command_and_wait_for_pattern
+from avocado_qemu import wait_for_console_pattern
+
+class S390CCWVirtioMachine(Test):
+    KERNEL_COMMON_COMMAND_LINE = 'printk.time=0 '
+
+    def wait_for_console_pattern(self, success_message, vm=None):
+        wait_for_console_pattern(self, success_message,
+                                 failure_message='Kernel panic - not syncing',
+                                 vm=vm)
+
+    timeout = 120
+
+    def test_s390x_devices(self):
+
+        """
+        :avocado: tags=arch:s390x
+        :avocado: tags=machine:s390-ccw-virtio
+        """
+
+        kernel_url = ('https://snapshot.debian.org/archive/debian/'
+                      '20201126T092837Z/dists/buster/main/installer-s390x/'
+                      '20190702+deb10u6/images/generic/kernel.debian')
+        kernel_hash = '5821fbee57d6220a067a8b967d24595621aa1eb6'
+        kernel_path = self.fetch_asset(kernel_url, asset_hash=kernel_hash)
+
+        initrd_url = ('https://snapshot.debian.org/archive/debian/'
+                      '20201126T092837Z/dists/buster/main/installer-s390x/'
+                      '20190702+deb10u6/images/generic/initrd.debian')
+        initrd_hash = '81ba09c97bef46e8f4660ac25b4ac0a5be3a94d6'
+        initrd_path = self.fetch_asset(initrd_url, asset_hash=initrd_hash)
+
+        self.vm.set_console()
+        kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
+                              'console=sclp0 root=/dev/ram0 BOOT_DEBUG=3')
+        self.vm.add_args('-nographic',
+                         '-kernel', kernel_path,
+                         '-initrd', initrd_path,
+                         '-append', kernel_command_line,
+                         '-device', 'virtio-net-ccw,devno=fe.1.1111',
+                         '-device', 'zpci,uid=5,target=zzz',
+                         '-device', 'virtio-net-pci,id=zzz')
+        self.vm.launch()
+
+        shell_ready = "sh: can't access tty; job control turned off"
+        self.wait_for_console_pattern(shell_ready)
+        # first debug shell is too early, we need to wait for device detection
+        exec_command_and_wait_for_pattern(self, 'exit', shell_ready)
+
+        ccw_bus_id="0.1.1111"
+        pci_bus_id="0005:00:00.0"
+        exec_command_and_wait_for_pattern(self, 'ls /sys/bus/ccw/devices/',
+                                          ccw_bus_id)
+        exec_command_and_wait_for_pattern(self, 'ls /sys/bus/pci/devices/',
+                                          pci_bus_id)
-- 
2.26.2