Re: [PATCH v4 2/4] avocado_qemu: Add SMMUv3 tests

[Eric Auger <eric.auger@redhat.com>]

Hi Wainer,

On 7/1/21 8:13 PM, Wainer dos Santos Moschetta wrote:
> Hi,
>
> On 6/29/21 11:36 AM, Eric Auger wrote:
>> Add new tests checking the good behavior of the SMMUv3 protecting
>> 2 virtio pci devices (block and net). We check the guest boots and
>> we are able to install a package. Different guest configs are tested:
>> standard, passthrough an strict=0. This is tested with both fedora 31
>> and
>> 33. The former uses a 5.3 kernel without range invalidation whereas the
>> latter uses a 5.8 kernel that features range invalidation.
>>
>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>>
>> ---
>>
>> v3 -> v4:
>> - add tags for machine, distro in the class
>> - removed smp and memory overrides
>> - set default param value of common_vm_setup to False
>>
>> v1 -> v2:
>> - removed ssh import
>> - combined add_command_args() and common_vm_setup()
>> - moved tags in class' docstring and added tags=arch:aarch64
>> - use self.get_default_kernel_params()
>> - added RIL tests with fed33 + introduce new tags
>> ---
>>   tests/acceptance/smmu.py | 132 +++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 132 insertions(+)
>>   create mode 100644 tests/acceptance/smmu.py
>
> Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
>
> Tested-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
>
> I tested it in a Fedora 32 aarch64 host. The execution output:
>
> # ./tests/venv/bin/avocado run tests/acceptance/smmu.py
> JOB ID     : 1625038f5a2ae17c8ba6c503d3df8661ff528942
> JOB LOG    :
> /root/avocado/job-results/job-2021-07-01T13.38-1625038/job.log
>  (1/6) tests/acceptance/smmu.py:SMMU.test_smmu_noril: PASS (175.54 s)
>  (2/6) tests/acceptance/smmu.py:SMMU.test_smmu_noril_passthrough:
> WARN: Test passed but there were warnings during execution. Check the
> log for details. (168.39 s)
>  (3/6) tests/acceptance/smmu.py:SMMU.test_smmu_noril_nostrict: WARN:
> Test passed but there were warnings during execution. Check the log
> for details. (161.58 s)
>  (4/6) tests/acceptance/smmu.py:SMMU.test_smmu_ril: PASS (150.85 s)
>  (5/6) tests/acceptance/smmu.py:SMMU.test_smmu_ril_passthrough: WARN:
> Test passed but there were warnings during execution. Check the log
> for details. (177.56 s)
>  (6/6) tests/acceptance/smmu.py:SMMU.test_smmu_ril_nostrict: WARN:
> Test passed but there were warnings during execution. Check the log
> for details. (190.86 s)
> RESULTS    : PASS 2 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 4 | INTERRUPT 0
> | CANCEL 0
> JOB TIME   : 1026.50 s
>
> One thing that caught my attention was the amount of time spent on
> each test. It spend more than 2 minutes on the package installation
> (`self.ssh_command('dnf -y install numactl-devel')`) in the guest.
>
> Without that operation, it runs way faster:
>
> # ./tests/venv/bin/avocado run tests/acceptance/smmu.py
> JOB ID     : 24f22f99169ece37df64d72d2eb373921f378aac
> JOB LOG    :
> /root/avocado/job-results/job-2021-07-01T13.28-24f22f9/job.log
>  (1/6) tests/acceptance/smmu.py:SMMU.test_smmu_noril: PASS (39.61 s)
>  (2/6) tests/acceptance/smmu.py:SMMU.test_smmu_noril_passthrough:
> WARN: Test passed but there were warnings during execution. Check the
> log for details. (48.32 s)
>  (3/6) tests/acceptance/smmu.py:SMMU.test_smmu_noril_nostrict: WARN:
> Test passed but there were warnings during execution. Check the log
> for details. (48.10 s)
>  (4/6) tests/acceptance/smmu.py:SMMU.test_smmu_ril: PASS (39.22 s)
>  (5/6) tests/acceptance/smmu.py:SMMU.test_smmu_ril_passthrough: WARN:
> Test passed but there were warnings during execution. Check the log
> for details. (52.92 s)
>  (6/6) tests/acceptance/smmu.py:SMMU.test_smmu_ril_nostrict: WARN:
> Test passed but there were warnings during execution. Check the log
> for details. (50.96 s)
> RESULTS    : PASS 2 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 4 | INTERRUPT 0
> | CANCEL 0
> JOB TIME   : 280.62 s
>
> Install a package seems a good exerciser for disk I/O and networking,
> but maybe you can use another method for the sake of speed up the tests?

As discussed earlier with Cleber, I am aware the test duration is long
but it was useful finding bugs for SMMU with range invalidation. such a
bug could not be hit with a single boot + ping for instance.

Maybe we should have a mechanism that allows to put some tests out of
the automatic CI?

Thanks

Eric
>
> - Wainer
>
>>
>> diff --git a/tests/acceptance/smmu.py b/tests/acceptance/smmu.py
>> new file mode 100644
>> index 0000000000..c1d4b88e5f
>> --- /dev/null
>> +++ b/tests/acceptance/smmu.py
>> @@ -0,0 +1,132 @@
>> +# SMMUv3 Functional tests
>> +#
>> +# Copyright (c) 2021 Red Hat, Inc.
>> +#
>> +# Author:
>> +#  Eric Auger <eric.auger@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 LinuxTest, BUILD_DIR
>> +
>> +class SMMU(LinuxTest):
>> +    """
>> +    :avocado: tags=accel:kvm
>> +    :avocado: tags=cpu:host
>> +    :avocado: tags=arch:aarch64
>> +    :avocado: tags=machine:virt
>> +    :avocado: tags=distro:fedora
>> +    :avocado: tags=smmu
>> +    """
>> +
>> +    IOMMU_ADDON =
>> ',iommu_platform=on,disable-modern=off,disable-legacy=on'
>> +    kernel_path = None
>> +    initrd_path = None
>> +    kernel_params = None
>> +
>> +    def set_up_boot(self):
>> +        path = self.download_boot()
>> +        self.vm.add_args('-device',
>> 'virtio-blk-pci,bus=pcie.0,scsi=off,' +
>> +                         'drive=drv0,id=virtio-disk0,bootindex=1,'
>> +                         'werror=stop,rerror=stop' + self.IOMMU_ADDON)
>> +        self.vm.add_args('-drive',
>> +                        
>> 'file=%s,if=none,cache=writethrough,id=drv0' % path)
>> +
>> +    def setUp(self):
>> +        super(SMMU, self).setUp(None, 'virtio-net-pci' +
>> self.IOMMU_ADDON)
>> +
>> +    def common_vm_setup(self, custom_kernel=False):
>> +        self.require_accelerator("kvm")
>> +        self.vm.add_args("-accel", "kvm")
>> +        self.vm.add_args("-cpu", "host")
>> +        self.vm.add_args("-machine", "iommu=smmuv3")
>> +        self.vm.add_args("-d", "guest_errors")
>> +        self.vm.add_args('-bios', os.path.join(BUILD_DIR, 'pc-bios',
>> +                         'edk2-aarch64-code.fd'))
>> +        self.vm.add_args('-device', 'virtio-rng-pci,rng=rng0')
>> +        self.vm.add_args('-object',
>> +                         'rng-random,id=rng0,filename=/dev/urandom')
>> +
>> +        if custom_kernel is False:
>> +            return
>> +
>> +        kernel_url = self.get_pxeboot_url() + 'vmlinuz'
>> +        initrd_url = self.get_pxeboot_url() + 'initrd.img'
>> +        self.kernel_path = self.fetch_asset(kernel_url)
>> +        self.initrd_path = self.fetch_asset(initrd_url)
>> +
>> +    def run_and_check(self):
>> +        if self.kernel_path:
>> +            self.vm.add_args('-kernel', self.kernel_path,
>> +                             '-append', self.kernel_params,
>> +                             '-initrd', self.initrd_path)
>> +        self.launch_and_wait()
>> +        self.ssh_command('cat /proc/cmdline')
>> +        self.ssh_command('dnf -y install numactl-devel')
>> +
>> +
>> +    # 5.3 kernel without RIL #
>> +
>> +    def test_smmu_noril(self):
>> +        """
>> +        :avocado: tags=smmu_noril
>> +        :avocado: tags=smmu_noril_tests
>> +        :avocado: tags=distro_version:31
>> +        """
>> +        self.common_vm_setup()
>> +        self.run_and_check()
>> +
>> +    def test_smmu_noril_passthrough(self):
>> +        """
>> +        :avocado: tags=smmu_noril_passthrough
>> +        :avocado: tags=smmu_noril_tests
>> +        :avocado: tags=distro_version:31
>> +        """
>> +        self.common_vm_setup(True)
>> +        self.kernel_params = self.get_default_kernel_params() + '
>> iommu.passthrough=on'
>> +        self.run_and_check()
>> +
>> +    def test_smmu_noril_nostrict(self):
>> +        """
>> +        :avocado: tags=smmu_noril_nostrict
>> +        :avocado: tags=smmu_noril_tests
>> +        :avocado: tags=distro_version:31
>> +        """
>> +        self.common_vm_setup(True)
>> +        self.kernel_params = self.get_default_kernel_params() + '
>> iommu.strict=0'
>> +        self.run_and_check()
>> +
>> +    # 5.8 kernel featuring range invalidation
>> +    # >= v5.7 kernel
>> +
>> +    def test_smmu_ril(self):
>> +        """
>> +        :avocado: tags=smmu_ril
>> +        :avocado: tags=smmu_ril_tests
>> +        :avocado: tags=distro_version:33
>> +        """
>> +        self.common_vm_setup()
>> +        self.run_and_check()
>> +
>> +    def test_smmu_ril_passthrough(self):
>> +        """
>> +        :avocado: tags=smmu_ril_passthrough
>> +        :avocado: tags=smmu_ril_tests
>> +        :avocado: tags=distro_version:33
>> +        """
>> +        self.common_vm_setup(True)
>> +        self.kernel_params = self.get_default_kernel_params() + '
>> iommu.passthrough=on'
>> +        self.run_and_check()
>> +
>> +    def test_smmu_ril_nostrict(self):
>> +        """
>> +        :avocado: tags=smmu_ril_nostrict
>> +        :avocado: tags=smmu_ril_tests
>> +        :avocado: tags=distro_version:33
>> +        """
>> +        self.common_vm_setup(True)
>> +        self.kernel_params = self.get_default_kernel_params() + '
>> iommu.strict=0'
>> +        self.run_and_check()
>