Re: [Qemu-devel] [qemu-s390x] [PULL 2/2] iotests: simple mirror test with kvm on 1G image

[Christian Borntraeger <borntraeger@de.ibm.com>]

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 <borntraeger@de.ibm.com>
---
 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,
                 str(size))
 
 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)
 vm.launch()
 


Shall I resend a v2?