[PATCH] KVM: fix powerpc build error for !CONFIG_KVM
Gleb Natapov
gleb at redhat.com
Fri Mar 22 18:21:03 EST 2013
On Fri, Mar 22, 2013 at 02:35:50PM +1100, Stephen Rothwell wrote:
> Fixes these build error when CONFIG_KVM is not defined:
>
> In file included from arch/powerpc/include/asm/kvm_ppc.h:33:0,
> from arch/powerpc/kernel/setup_64.c:67:
> arch/powerpc/include/asm/kvm_book3s.h:65:20: error: field 'pte' has incomplete type
> arch/powerpc/include/asm/kvm_book3s.h:69:18: error: field 'vcpu' has incomplete type
> arch/powerpc/include/asm/kvm_book3s.h:98:34: error: 'HPTEG_HASH_NUM_PTE' undeclared here (not in a function)
> arch/powerpc/include/asm/kvm_book3s.h:99:39: error: 'HPTEG_HASH_NUM_PTE_LONG' undeclared here (not in a function)
> arch/powerpc/include/asm/kvm_book3s.h:100:35: error: 'HPTEG_HASH_NUM_VPTE' undeclared here (not in a function)
> arch/powerpc/include/asm/kvm_book3s.h:101:40: error: 'HPTEG_HASH_NUM_VPTE_LONG' undeclared here (not in a function)
> arch/powerpc/include/asm/kvm_book3s.h:129:4: error: 'struct kvm_run' declared inside parameter list [-Werror]
> arch/powerpc/include/asm/kvm_book3s.h:129:4: error: its scope is only this definition or declaration, which is probably not what you want [-Werror]
>
> ... and so on ...
>
> This was introduced by commit f445f11eb2cc265dd47da5b2e864df46cd6e5a82
> "KVM: allow host header to be included even for !CONFIG_KVM"
>
This will re-introduce the problem that Kevin tried to fix with his
original patch. The problem is that kernel/context_tracking.c includes
linux/kvm_host.h unconditionally and the later includes asm/kvm_host.h
and this breaks on archs without KVM.
I think the correct solution is to not include linux/kvm_host.h in
kernel/context_tracking.c unconditionally. The patch by Kevin is here:
http://lkml.org/lkml/2013/3/21/745
> Cc: Kevin Hilman <khilman at linaro.org>
> Cc: Marcelo Tosatti <mtosatti at redhat.com>
> Signed-off-by: Stephen Rothwell <sfr at canb.auug.org.au>
> ---
> include/linux/kvm_host.h | 11 +++++------
> 1 file changed, 5 insertions(+), 6 deletions(-)
>
> Kevin, does this still fix the error that commit
> f445f11eb2cc265dd47da5b2e864df46cd6e5a82 was fixing?
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index a942863..90ebec0 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1,8 +1,6 @@
> #ifndef __KVM_HOST_H
> #define __KVM_HOST_H
>
> -#if IS_ENABLED(CONFIG_KVM)
> -
> /*
> * This work is licensed under the terms of the GNU GPL, version 2. See
> * the COPYING file in the top-level directory.
> @@ -751,6 +749,7 @@ static inline int kvm_deassign_device(struct kvm *kvm,
> }
> #endif /* CONFIG_IOMMU_API */
>
> +#if IS_ENABLED(CONFIG_KVM)
> static inline void __guest_enter(void)
> {
> /*
> @@ -770,6 +769,10 @@ static inline void __guest_exit(void)
> vtime_account_system(current);
> current->flags &= ~PF_VCPU;
> }
> +#else
> +static inline void __guest_enter(void) { return; }
> +static inline void __guest_exit(void) { return; }
> +#endif /* IS_ENABLED(CONFIG_KVM) */
>
> #ifdef CONFIG_CONTEXT_TRACKING
> extern void guest_enter(void);
> @@ -1057,8 +1060,4 @@ static inline bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
> }
>
> #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
> -#else
> -static inline void __guest_enter(void) { return; }
> -static inline void __guest_exit(void) { return; }
> -#endif /* IS_ENABLED(CONFIG_KVM) */
> #endif
> --
> 1.8.1
>
> --
> Cheers,
> Stephen Rothwell sfr at canb.auug.org.au
--
Gleb.
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