linux-kernel - Re: [PATCH v2] KVM: SVM: Fix implicit declaration for __default_cpu_present_to

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Date:	Thu, 16 Jun 2016 00:28:10 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	rkrcmar@...hat.com, fengguang.wu@...el.com, kbuild-all@...org
Subject: Re: [PATCH v2] KVM: SVM: Fix implicit declaration for
 __default_cpu_present_to_apicid()

Thanks, queuing both patches for 4.7-rc.

Paolo

On 16/06/2016 00:23, Suravee Suthikulpanit wrote:
> The commit 8221c1370056 ("svm: Manage vcpu load/unload when enable AVIC")
> introduces a build error due to implicit function declaration
> when #ifdef CONFIG_X86_32 and #ifndef CONFIG_X86_LOCAL_APIC
> (as reported by Kbuild test robot i386-randconfig-x0-06121009).
> 
> So, this patch introduces kvm_cpu_get_apicid() wrapper
> around __default_cpu_present_to_apicid() with additional
> handling if CONFIG_X86_LOCAL_APIC is not defined.
> 
> Reported-by: kbuild test robot <fengguang.wu@...el.com>
> Fixes: commit 8221c1370056 ("svm: Manage vcpu load/unload when enable AVIC")
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  arch/x86/include/asm/kvm_host.h | 11 +++++++++++
>  arch/x86/kvm/svm.c              |  6 +++---
>  2 files changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index a714cc2..fe1c5c3 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -27,6 +27,7 @@
>  #include <linux/irqbypass.h>
>  #include <linux/hyperv.h>
>  
> +#include <asm/apic.h>
>  #include <asm/pvclock-abi.h>
>  #include <asm/desc.h>
>  #include <asm/mtrr.h>
> @@ -1370,4 +1371,14 @@ static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
>  
>  static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
>  
> +static inline int kvm_cpu_get_apicid(int mps_cpu)
> +{
> +#ifdef CONFIG_X86_LOCAL_APIC
> +	return __default_cpu_present_to_apicid(mps_cpu);
> +#else
> +	WARN_ON_ONCE(1);
> +	return BAD_APICID;
> +#endif
> +}
> +
>  #endif /* _ASM_X86_KVM_HOST_H */
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 5b12438..0d2aa13 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -1402,7 +1402,7 @@ avic_update_iommu(struct kvm_vcpu *vcpu, int cpu, phys_addr_t pa, bool r)
>  static void avic_set_running(struct kvm_vcpu *vcpu, bool is_run)
>  {
>  	u64 entry;
> -	int h_physical_id = __default_cpu_present_to_apicid(vcpu->cpu);
> +	int h_physical_id = kvm_cpu_get_apicid(vcpu->cpu);
>  	struct vcpu_svm *svm = to_svm(vcpu);
>  
>  	if (!kvm_vcpu_apicv_active(vcpu))
> @@ -1434,7 +1434,7 @@ static void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>  {
>  	u64 entry;
>  	/* ID = 0xff (broadcast), ID > 0xff (reserved) */
> -	int h_physical_id = __default_cpu_present_to_apicid(cpu);
> +	int h_physical_id = kvm_cpu_get_apicid(cpu);
>  	struct vcpu_svm *svm = to_svm(vcpu);
>  
>  	if (!kvm_vcpu_apicv_active(vcpu))
> @@ -4328,7 +4328,7 @@ static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
>  
>  	if (avic_vcpu_is_running(vcpu))
>  		wrmsrl(SVM_AVIC_DOORBELL,
> -		       __default_cpu_present_to_apicid(vcpu->cpu));
> +		       kvm_cpu_get_apicid(vcpu->cpu));
>  	else
>  		kvm_vcpu_wake_up(vcpu);
>  }
>