linux-kernel - [Kernel 6.12.17] [PowerPC e5500] KVM HV compilation error

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Message-Id: <DDEA8D1B-0A0F-4CF3-9A73-7762FFEFD166@xenosoft.de>
Date: Wed, 5 Mar 2025 15:14:13 +0100
From: Christian Zigotzky <chzigotzky@...osoft.de>
To: Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
 kvm@...r.kernel.org, seanjc@...gle.com, linuxppc-dev@...ts.ozlabs.org,
 regressions@...ts.linux.dev, Greg KH <greg@...ah.com>
Cc: Trevor Dickinson <rtd2@...a.co.nz>,
 mad skateman <madskateman@...il.com>, hypexed@...oo.com.au,
 Darren Stevens <darren@...vens-zone.net>
Subject: [Kernel 6.12.17] [PowerPC e5500] KVM HV compilation error

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