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


From: Cornelia Huck
Subject: Re: [PATCH RFC] tests/acceptance: add a test for devices on s390x
Date: Wed, 25 Nov 2020 16:30:34 +0100

On Wed, 25 Nov 2020 16:03:13 +0100
Thomas Huth <thuth@redhat.com> wrote:

> On 25/11/2020 14.58, Cornelia Huck wrote:
> > 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.  
> 
> Thanks for tackling it!
> 
> > Signed-off-by: Cornelia Huck <cohuck@redhat.com>
> > ---
> > 
> > A very basic test, but it would have caught the recent zPCI regression.
> > 
> > If anyone has a better idea than using early debug shells in the Debian
> > install image, please let me know. At least it's quick, as we can check
> > for the devices quite early in the boot sequence.
> > 
> > Not sure if running under both kvm and tcg on an s390 host would add
> > useful extra coverage. Also not sure if this needs fencing on any of the
> > public CIs (have not tried yet).  
> 
> We're only running the acceptance tests in the gitlab-CI, no worries about
> the others.
> 
> > ---
> >  tests/acceptance/s390_devices.py | 68 ++++++++++++++++++++++++++++++++
> >  1 file changed, 68 insertions(+)
> >  create mode 100644 tests/acceptance/s390_devices.py
> > 
> > diff --git a/tests/acceptance/s390_devices.py 
> > b/tests/acceptance/s390_devices.py
> > new file mode 100644
> > index 000000000000..6ce47061f35d
> > --- /dev/null
> > +++ b/tests/acceptance/s390_devices.py  
> 
> s390x_devices.py ?
> 
> Or maybe even machine_s390x.py instead, like the other machine*.py files?

Makes sense.

> 
> > @@ -0,0 +1,68 @@
> > +# 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 CheckS390xDevices(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 = 60  
> 
> Running on public CIs can be slow ... I'd maybe directly start with 90 or
> 120 here.

Ok; I found it hard to pick a sensible value here.

> 
> > +    def test(self):
> > +
> > +        """
> > +        :avocado: tags=arch:s390x
> > +        :avocado: tags=machine:s390-ccw-virtio
> > +        """
> > +
> > +        # XXX: switch to https when debian fixes their certificate
> > +        kernel_url = ('http://archive.debian.org/debian/dists/jessie/main'
> > +                      
> > '/installer-s390x/current/images/generic/kernel.debian')
> > +        kernel_hash = '5af1aa839754f4d8817fb5878b4d55dfc887f45d'
> > +        kernel_path = self.fetch_asset(kernel_url, asset_hash=kernel_hash)
> > +
> > +        initrd_url = ('http://archive.debian.org/debian/dists/jessie/main'
> > +                      
> > '/installer-s390x/current/images/generic/initrd.debian')
> > +        initrd_hash = '99252b28306184b876f979585e2d4bfe96b27464'
> > +        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', 'virtio-net-pci')  
> 
> Maybe use '-device', 'virtio-net-pci,addr=6' or something similar to check a
> non-default PCI address, too?

Not sure if addr= will do the trick, I may need to add a zpci device.

> 
> > +        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="0000:00:00.0"
> > +        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)
> >   
> 
> Additional ideas (likely for later patches): Set a custom mac address for
> the virtio-net devices and check whether they show up correctly in the
> guest... Use "ping" to send some packets around (with -netdev user)...

This needs a fully running userspace, though. I was planning on adding
more device types first.




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