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

[Philippe Mathieu-Daudé]

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