x86_64 kernel does not start under qemu

Jan Kiszka jan.kiszka at siemens.com
Wed Mar 6 17:39:38 CET 2019


On 06.03.19 16:33, Richard Weinberger wrote:
> Am Mittwoch, 6. März 2019, 14:43:55 CET schrieb Jan Kiszka:
>> On 06.03.19 14:10, Jan Kiszka wrote:
>>> On 06.03.19 12:28, Lange Norbert via Xenomai wrote:
>>>> Hello,
>>>>
>>>> I have a similar issue on real hardware (cc Philippe). Can you try booting
>>>> with notscdeadline?
>>>>
>>>
>>> I would be surprised if it's that: QEMU does not emulate this APIC feature, only
>>> KVM does.
>>>
>>> I need to reproduce. Which QEMU version?
>>>
>>
>> Just booted current ipipe-x86-4.14.y (4.14.103) in QEMU 3.1+ (some development
>> snapshot) with -smp 4 - works fine. But these are likely quite a few variations
>> from your setup.
> 
> I'm on qemu 2.11.2.

That one might still be serializing SMP, thus only use one core on the host. 
Currently trying to emulate that as it changes timing.

> Is this plain ipipe? Just figured that you need to prepare the kernel
> with Xenomai to trigger the problem.
> Xenomai is 3.0.8.

I have Xenomai stable/v3.0.x running as well.

Jan

> 
> Kernel config is defconfig.
> 
> Thanks,
> //richard
> 
> 

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