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

[Christian Zigotzky]

On 26/12/24 08:00, Paolo Bonzini wrote:
>
>
> Il mer 25 dic 2024, 13:48 Christian Zigotzky <chzigotzky at xenosoft.de 
> <mailto:chzigotzky at xenosoft.de>> ha scritto:
>
>     > But do you see anything on the host dmesg (without and with the
>     > patch), for example a WARN?
>     Unfortunately no log during the start of KVM HV.
>
>
> Ok.
>
>     > Also you might try edebc0a1b7ab5ff19b4f5cd011c93196fc34b3e4 + the
>     > patch, to see if there are two bugs.
>     >
>     > Paolo
>     >
>     I think you mean 419cfb983ca93e75e905794521afefcfa07988bb because
>     "git
>     checkout edebc0a1b7ab5ff19b4f5cd011c93196fc34b3e4" doesn't work.
>
>     Error message: fatal: reference is not a tree:
>     edebc0a1b7ab5ff19b4f5cd011c93196fc34b3e4
>
>     git checkout 419cfb983ca93e75e905794521afefcfa07988bb
>
>
> That's the upstream commit that doesn't boot. 
> edebc0a1b7ab5ff19b4f5cd011c93196fc34b3e4 was the rebased version of 
> the same commit, where your bisection finished.
>
> Paolo

Hi Paolo,

This has solved the issue:

cp linux-6.12.6/arch/powerpc/kvm/e500_mmu_host.c 
a/arch/powerpc/kvm/e500_mmu_host.c

cp linux-6.12.6/include/linux/kvm_host.h a/include/linux/kvm_host.h

cp linux-6.12.6/virt/kvm/kvm_main.c a/virt/kvm/kvm_main.c

cp linux-6.12.6/virt/kvm/kvm_mm.h a/virt/kvm/kvm_mm.h

I created a patch for reverting the code that leads to the issue.

Link: 
https://github.com/chzigotzky/kernels/blob/main/patches/X5000/kvm_ppc_revert.patch

Maybe you can find a hint to the issue in this revert patch.

I will further test KVM HV with the patched kernel.

Thanks,
Christian

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