Re: [Qemu-devel] [PATCH v3 3/6] tests/acceptance: Add test_mips_4kc_malta in BootLinuxConsole

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 19/10/2018 19:42, Cleber Rosa wrote:
> 
> 
> On 10/13/18 11:15 AM, Philippe Mathieu-Daudé wrote:
>> Similar to the test_x86_64_pc test, this boots a Linux kernel on a
>> Malta board (MIPS 4Kc big-endian) and verify the serial is working.
>>
>> This test requires the dpkg-deb tool (apt/dnf install dpkg) to
>> extract the kernel from the Debian package.
>>
> 
> Debian packages are really "ar" archives, with a control.tar.gz and
> data.tar.gz in them.  More on that later.
> 
>>   $ avocado --show=console run -p arch=mips tests/acceptance/boot_linux_console.py
>>   console: [    0.000000] Initializing cgroup subsys cpuset
>>   console: [    0.000000] Initializing cgroup subsys cpu
>>   console: [    0.000000] Linux version 2.6.32-5-4kc-malta (Debian 2.6.32-48) (ben@decadent.org.uk) (gcc version 4.3.5 (Debian 4.3.5-4) ) #1 Sat Feb 16 12:43:42 UTC 2013
>>   console: [    0.000000]
>>   console: [    0.000000] LINUX started...
>>   console: [    0.000000] bootconsole [early0] enabled
>>   console: [    0.000000] CPU revision is: 00019300 (MIPS 24Kc)
>>   console: [    0.000000] FPU revision is: 00739300
>>   console: [    0.000000] Determined physical RAM map:
>>   console: [    0.000000]  memory: 00001000 @ 00000000 (reserved)
>>   console: [    0.000000]  memory: 000ef000 @ 00001000 (ROM data)
>>   console: [    0.000000]  memory: 005b7000 @ 000f0000 (reserved)
>>   console: [    0.000000]  memory: 03958000 @ 006a7000 (usable)
>>   console: [    0.000000] Wasting 54496 bytes for tracking 1703 unused pages
>>   console: [    0.000000] Initrd not found or empty - disabling initrd
>>   console: [    0.000000] Zone PFN ranges:
>>   console: [    0.000000]   DMA      0x00000000 -> 0x00001000
>>   console: [    0.000000]   Normal   0x00001000 -> 0x00003fff
>>   console: [    0.000000] Movable zone start PFN for each node
>>   console: [    0.000000] early_node_map[1] active PFN ranges
>>   console: [    0.000000]     0: 0x00000000 -> 0x00003fff
>>   console: [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16255
>>   console: [    0.000000] Kernel command line: console=ttyS0 printk.time=0
>>
>> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>> ---
>>  tests/acceptance/boot_linux_console.py | 46 ++++++++++++++++++++++++++
>>  1 file changed, 46 insertions(+)
>>
>> diff --git a/tests/acceptance/boot_linux_console.py b/tests/acceptance/boot_linux_console.py
>> index 3aa4dbe5f9..81c96fc338 100644
>> --- a/tests/acceptance/boot_linux_console.py
>> +++ b/tests/acceptance/boot_linux_console.py
>> @@ -9,6 +9,7 @@
>>  # later.  See the COPYING file in the top-level directory.
>>  
>>  import logging
>> +import subprocess
> 
> It's definitely your call, but I like to think that
> avocado.utils.process provides simpler and more capable functions:
> 
> https://avocado-framework.readthedocs.io/en/65.0/api/utils/avocado.utils.html#avocado.utils.process.run

OK

> 
>>  
>>  from avocado_qemu import Test
>>  
>> @@ -47,3 +48,48 @@ class BootLinuxConsole(Test):
>>                  break
>>              if 'Kernel panic - not syncing' in msg:
>>                  self.fail("Kernel panic reached")
>> +
>> +    def test_mips_4kc_malta(self):
>> +        """
>> +        This test requires the dpkg-deb tool (apt/dnf install dpkg) to extract
>> +        the kernel from the Debian package.
>> +
>> +        The kernel can be rebuilt using this Debian kernel source [1] and
>> +        following the instructions on [2].
>> +
>> +        [1] https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s-common-official
>> +        [2] http://snapshot.debian.org/package/linux-2.6/2.6.32-48/#linux-source-2.6.32_2.6.32-48
>> +
>> +        :avocado: tags=arch:mips
>> +        """
>> +        if self.arch != 'mips': # FIXME use 'arch' tag in parent class?
>> +            self.cancel('Currently specific to the %s target arch' % self.arch)
>> +
> 
> I missed how the arch tag in the parent class (common to all tests here)
> would be useful for this specific test.

I probably forgot to remove it.

> 
>> +        deb_url = ('http://snapshot.debian.org/archive/debian/20130217T032700Z/'
>> +                   'pool/main/l/linux-2.6/'
>> +                   'linux-image-2.6.32-5-4kc-malta_2.6.32-48_mips.deb')
>> +        deb_hash = 'a8cfc28ad8f45f54811fc6cf74fc43ffcfe0ba04'
>> +        deb_path = self.fetch_asset(deb_url, asset_hash=deb_hash)
>> +        subprocess.check_call(['dpkg-deb', '--extract', deb_path, self.workdir]) # FIXME move to avocado ...
> 
> This could become:
> 
>  # from avocado.utils.process import run
>  run("ar p %s data.tar.gz | tar zxf - -C %s
> ./boot/vmlinux-2.6.32-5-4kc-malta" % (deb_path, self.workdir), shell=True)

OK!

> 
>> +        kernel_path = self.workdir + '/boot/vmlinux-2.6.32-5-4kc-malta'          # FIXME ... and use from assets?
>> +
> 
> Putting produced/processed files back into the cache would be nice
> addition to the asset fetcher (or related tools).  Not there yet, though.

OK :/

> 
>> +        self.vm.set_arch(self.arch)
>> +        self.vm.set_machine('malta')
>> +        self.vm.set_console("") # XXX this disable isa-serial to use -serial ...
> 
> See the comments on the previous patch.  Basically, if a machine doesn't
> need an explicit console device to be added, set_console() should do
> just that (not add one).  The ideal API would be to call set_console()
> without any explicit parameter IMO.

Sure.

> 
> That assumes, what I believe to be true, that we don't want to setup
> multiple *console* devices per QEMUMachine, right?

There might be weird corner-cases but usually machines only have one
type of (default) console.

> 
> Regards,
> - Cleber.
> 
>> +        kernel_command_line = 'console=ttyS0 printk.time=0'
>> +        self.vm.add_args('-m', "64",
>> +                         '-serial', "chardev:console", # XXX ... here.
>> +                         '-kernel', kernel_path,
>> +                         '-append', kernel_command_line)
>> +
>> +        # FIXME below to parent class?
>> +        self.vm.launch()
>> +        console = self.vm.console_socket.makefile()
>> +        console_logger = logging.getLogger('console')
>> +        while True:
>> +            msg = console.readline()
>> +            console_logger.debug(msg.strip())
>> +            if 'Kernel command line: %s' % kernel_command_line in msg:
>> +                break
>> +            if 'Kernel panic - not syncing' in msg:
>> +                self.fail("Kernel panic reached")
>>
>