Re: [RFC v1 00/38] arm cleanup experiment for kvm-only build

[Claudio Fontana]

On 3/3/21 7:34 PM, Philippe Mathieu-Daudé wrote:
> On 3/3/21 6:57 PM, Claudio Fontana wrote:
>> On 3/1/21 5:23 PM, Alex Bennée wrote:
>>>
>>> Claudio Fontana <cfontana@suse.de> writes:
>>>
>>>> On 2/23/21 10:18 AM, Philippe Mathieu-Daudé wrote:
>>>>> On 2/22/21 8:00 PM, Alex Bennée wrote:
>>>>>>
>>>>>> Claudio Fontana <cfontana@suse.de> writes:
>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> this is an experiment, a cleanup based on and requiring the series
>>>>>>> "i386 cleanup PART 2":
>>>>>>>
>>>>>>> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg05935.html
>>>>>>>
>>>>>>> The goal is to split the code between TCG-only and non-TCG code,
>>>>>>> fixing the KVM-only build (configure --disable-tcg),
>>>>>>>
>>>>>>> and laying the ground for further cleanups and the use of the
>>>>>>> new accel objects in the hierarchy to specialize the cpu
>>>>>>> according to the accelerator.
>>>>>>>
>>>>>>> This is known to be an early state, with probably a lot of work
>>>>>>> still needed.
>>>>>>
>>>>>> Well early work is looking pretty good:
>>>>>>
>>>>>>   18:59:22 [alex@idun:~/l/q/b/default] review/arm-cleanup-rfc1|… ± ls 
>>>>>> -lh qemu-system-aarch64
>>>>>>   -rwxr-xr-x 1 alex alex 107M Feb 22 18:08 qemu-system-aarch64*
>>>>>>   18:59:29 [alex@idun:~/l/q/b/default] review/arm-cleanup-rfc1|… ± ls 
>>>>>> -lh ../disable.tcg/qemu-system-aarch64
>>>>>>   -rwxr-xr-x 1 alex alex 76M Feb 22 17:47 
>>>>>> ../disable.tcg/qemu-system-aarch64*
>>>>>
>>>>> :~)
>>>>>
>>>>>>
>>>>>> and I've tested the KVM side works well enough with a basic image.
>>>>>
>>>>>
>>>>
>>>> I am working on the next version, one thing I noticed among others as I 
>>>> get close to the v2,
>>>> is the fact that tests/ for arm require tcg in many cases.
>>>
>>> I think in a lot of cases they are historical because developers
>>> generally weren't running on native hardware. That said off the top of
>>> my head:
>>>
>>>   tests/tcg - linux-user, so implies TCG
>>>   tests/tcg/system - use semihosting (at least for arm/aarch64) - which 
>>> implies TCG
>>>   tests/acceptance/[replay_kernel/reverse_debugging/tcg_plugins] - all need 
>>> TCG features
>>>
>>> I don't think there is any reason the others can't run with KVM - and
>>> probably should on real hardware.
>>
>>
>> One thing I noticed is that tests try to run qemu-system-aarch64 with accel 
>> "qtest" and machine "virt",
>> and the thing tries to create a cortex-a15 cpu model for some unknown reason.
>>
>> Digging and sweating..
> 
> I already sent a series to fix that, feel free to reuse
> some patches:
> https://www.mail-archive.com/qemu-block@nongnu.org/msg80440.html
> 

Ah yes I took already something from here, will look some more thanks!

Ciao,

Claudio