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Re: [qemu-s390x] [Qemu-devel] [PULL 2/2] iotests: simple mirror test wit

From: Christian Borntraeger
Subject: Re: [qemu-s390x] [Qemu-devel] [PULL 2/2] iotests: simple mirror test with kvm on 1G image
Date: Wed, 5 Dec 2018 16:52:46 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 05.12.2018 14:39, Vladimir Sementsov-Ogievskiy wrote:
> 05.12.2018 15:35, Christian Borntraeger wrote:
>> On 05.12.2018 13:00, Vladimir Sementsov-Ogievskiy wrote:
>>> 05.12.2018 12:01, Christian Borntraeger wrote:
>>>> On 05.12.2018 09:46, Kevin Wolf wrote:
>>>>> Am 05.12.2018 um 09:23 hat Christian Borntraeger geschrieben:
>>>>>>>>> +# prepare source image
>>>>>>>>> +qemu_img_create('-f', iotests.imgfmt, '-o', 
>>>>>>>>> 'preallocation=metadata', disk,
>>>>>>>>> +                str(size))
>>>>>>>>> +
>>>>>>>>> +vm = QEMUMachine(iotests.qemu_prog)
>>>>>>>>> +vm.add_args('-machine', 'pc,accel=kvm')
>>>>>> This (pc) clearly does not work on other architectures.
>>>>>> In addition to that, I also need to add -no-shutdown on s390 (see 068 
>>>>>> for a similar case)
>>>>> Leaving out pc definitely makes sense, and the bug still reproduces for
>>>>> me without it.
>>>>> I don't understand the -no-shutdown, though. Already for 068, neither
>>>>> the code nor the commit message when it was added explain why this is
>>>>> needed.
>>>>> Can you turn this into a proper patch and add a comment why -no-shutdown
>>>>> is needed?
>>>> I already sent this patch. The reason is that there is no BIOS in a 
>>>> classical sense
>>>> on s390x. If no bootable image (external kernel or from disk) is found, 
>>>> the small boot
>>>> bios loads a disabled wait PSW. The default action for that is then 
>>>> shutdown.
>>> Is it an option for you just drop the whole line "vm.add_args('-machine', 
>>> 'pc,accel=kvm')"?
>>> The problem without it for me was that gdb failed to produce full and nice 
>>> backtrace, but
>>> test worked anyway
>> In the commid message Vladimir said that kvm is necessary to trigger the 
>> problem.
> No, I didn't)
> and it's in the comment:
> # 3. drop kvm and use iotests.VM() (maybe, because of qtest) (however, it 
> still
> #    reproduces, if just drop kvm, but gdb failed to produce full backtraces
> #    for me)

Ok, so I would be fine with completely dropping that line.

the patch would then be

"-machine pc" will not work all architectures. Lets fall back to the
default machine by not specifying anything for the machine.

In addition we also need to specify -no-shutdown on s390 as qemu will
exit on guest shutdown. This happens when there is no kernel or bootable
disk on s390.

Signed-off-by: Christian Borntraeger <address@hidden>
 tests/qemu-iotests/235 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/235 b/tests/qemu-iotests/235
index da044ed34e..329da8f0c2 100755
--- a/tests/qemu-iotests/235
+++ b/tests/qemu-iotests/235
@@ -49,7 +49,8 @@ qemu_img_create('-f', iotests.imgfmt, '-o', 
'preallocation=metadata', disk,
 vm = QEMUMachine(iotests.qemu_prog)
-vm.add_args('-machine', 'pc,accel=kvm')
+if iotests.qemu_default_machine == 's390-ccw-virtio':
+        vm.add_args('-no-shutdown')
 vm.add_args('-drive', 'id=src,file=' + disk)

Shall I resend a v2?

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