KVM: PPC: Book3E: KVM HV host module doesn't work anymore

[Christian Zigotzky <chzigotzky@xenosoft.de>]

On 18/12/24 15:41, Christian Zigotzky wrote:
> On 18/12/24 12:10, Christian Zigotzky wrote:
>> Hello,
>>
>> The KVM HV host module doesn't work anymore since the PowerPC updates 
>> 6.13-1 [1] and PowerPC MM updates [2].
>>
>> We have tested it with our FSL P5020/P5040 boards [3].
>>
>> The guest kernel doesn't boot. There is no output via the serial 
>> connection and no output via the graphics card. (QEMU)
>>
>> It boots without the PowerPC updates 6.13-1 [1] and PowerPC MM 
>> updates [2].
>>
>> Is the problem already known? Is there already a solution? I have 
>> seen many Book3S KVM HV updates. Have you perhaps forgotten Book3E?
>>
>> Thanks,
>> Christian
>>
>> [1] 
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=42d9e8b7ccddee75989283cf7477305cfe3776ff
>> [2] 
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c00ff742bf5caf85f60e1c73999f99376fb865d
>> [3] http://wiki.amiga.org/index.php?title=X5000
>>
>
> I tried to bisect but without success. Link: 
> https://github.com/chzigotzky/kernels/issues/4#issuecomment-2551460323
>
> -- Christian
>
It seems, that the PowerPC updates 6.13-1 aren't responsible for this 
issue. I had to test the PowerPC updates 6.13-1 during the bisect. [1]

Bisecting: 428 revisions left to test after this (roughly 9 steps)
[42d9e8b7ccddee75989283cf7477305cfe3776ff] Merge tag 'powerpc-6.13-1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Result:  git bisect good

There aren't any changes in the PowerPC MM updates [2].

Do you have another idea? I like KVM HV on my FSL P5040 system and use 
it very often for testing. However, KVM HV is hardly used by our users, 
so we could remove it from our kernels if it were not fixed. It would 
save space to remove it.

-- Christian

[1] https://github.com/chzigotzky/kernels/issues/4
[2] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c00ff742bf5caf85f60e1c73999f99376fb865d