Re: [PATCH 0/2] KVM: PPC: BookE: Fix boot hang on preemptible kernels

[Christian Zigotzky <chzigotzky@xenosoft.de>]

On 29/09/26 17:51, Christian Zigotzky wrote:
> On 28/09/26 13:04, Shrikanth Hegde wrote:
>> Christian Zigotzky had reported that preemptible kernels don't boot on
>> his FSL Cyrus+ board. The board freezes on running either full/lazy
>> preemption and has been an issue for a while now.
>>
>> https://lore.kernel.org/all/b897b0fd-90f2-4215-bcd4-3714e497d773@xenosoft.de/#t 
>>
>>
>> After 7.0, there is only preempt=full/lazy which removed the
>> preempt=none/voluntary workaround used to mask the issue. There was
>> challenge is getting the console logs which made the fixes difficult 
>> since
>> one couldn't know where the issue is.
>>
>> Thanks to Michal for helping in getting the logs. That pointed at few
>> places where the issue could be. This series is an attempt at fixing
>> those.
>>
>> Christian, KVM team,
>> Please *test* the patches.
>>
>> Shrikanth Hegde (2):
>>    KVM: PPC: BookE: Disable preemption before loading guest FP and
>>      Altivec
>>    KVM: PPC: Replay pending interrupts before entering the guest
>>
>>   arch/powerpc/kvm/booke.c   |  9 ++++++++-
>>   arch/powerpc/kvm/powerpc.c | 13 +++++++++++++
>>   2 files changed, 21 insertions(+), 1 deletion(-)
>>
> Hi,
>
> I was able to compile the RC5 of kernel 7.3 with your patches today. 
> :-) [1]
>
> After that I successfully tested it with KVM PR and KVM HV on my 
> PowerPC machines.
>
> Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
>
> Many thanks for your help,
>
> Christian
>
>
> [1] https://github.com/chzigotzky/kernels/releases/tag/v7.3.0-rc5-2
>
>
Hi,

is it possible to add these patches to the kernel 7.4?

Thanks,
Christian

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