linux-kernel - Re: [PATCH] KVM: x86: hide KVM_HC_CLOCK

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Date:   Thu, 9 Feb 2017 16:24:02 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
        Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: hide KVM_HC_CLOCK_PAIRING on 32 bit



On 09/02/2017 16:10, Arnd Bergmann wrote:
> The newly added hypercall doesn't work on x86-32:
> 
> arch/x86/kvm/x86.c: In function 'kvm_pv_clock_pairing':
> arch/x86/kvm/x86.c:6163:6: error: implicit declaration of function 'kvm_get_walltime_and_clockread';did you mean 'kvm_get_time_scale'? [-Werror=implicit-function-declaration]
> 
> This adds an #ifdef around it, matching the one around the related
> functions that are also only implemented on 64-bit systems.
> 
> Fixes: 55dd00a73a51 ("KVM: x86: add KVM_HC_CLOCK_PAIRING hypercall")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/x86/kvm/x86.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 10e20afc3314..2bcdc88c8242 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6149,6 +6149,7 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu)
>  }
>  EXPORT_SYMBOL_GPL(kvm_emulate_halt);
>  
> +#ifdef CONFIG_X86_64
>  static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
>  			        unsigned long clock_type)
>  {
> @@ -6175,6 +6176,7 @@ static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
>  
>  	return ret;
>  }
> +#endif
>  
>  /*
>   * kvm_pv_kick_cpu_op:  Kick a vcpu.
> @@ -6240,9 +6242,11 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
>  		kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1);
>  		ret = 0;
>  		break;
> +#ifdef CONFIG_X86_64
>  	case KVM_HC_CLOCK_PAIRING:
>  		ret = kvm_pv_clock_pairing(vcpu, a0, a1);
>  		break;
> +#endif
>  	default:
>  		ret = -KVM_ENOSYS;
>  		break;
> 

Applied, thanks.

Paolo