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

[Christian Zigotzky <chzigotzky@xenosoft.de>]

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


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