[Kernel 6.12.17] [PowerPC e5500] KVM HV compilation error

Christian Zigotzky
2025-03-05T14:14:53Z

Hi All,

The stable long-term kernel 6.12.17 cannot compile with KVM HV support for e5500 PowerPC machines anymore.

Bug report: https://github.com/chzigotzky/kernels/issues/6

Kernel config: https://github.com/chzigotzky/kernels/blob/6_12/configs/x5000_defconfig

Error messages:

arch/powerpc/kvm/e500_mmu_host.c: In function 'kvmppc_e500_shadow_map':
arch/powerpc/kvm/e500_mmu_host.c:447:9: error: implicit declaration of function '__kvm_faultin_pfn' [-Werror=implicit-function-declaration]
pfn = __kvm_faultin_pfn(slot, gfn, FOLL_WRITE, NULL, &page);
^~~~~~~~~~~~~~~~~
CC kernel/notifier.o
arch/powerpc/kvm/e500_mmu_host.c:500:2: error: implicit declaration of function 'kvm_release_faultin_page'; did you mean 'kvm_read_guest_page'? [-Werror=implicit-function-declaration]
kvm_release_faultin_page(kvm, page, !!ret, writable);

After that, I compiled it without KVM HV support.

Kernel config: https://github.com/chzigotzky/kernels/blob/6_12/configs/e5500_defconfig

Please check the error messages.

Thanks,
Christian