Re: [RFC PATCH] KVM: x86: Skip request checking branches in vcpu_enter_guest() more effectively

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On Mon, 24 Sep 2012 09:16:12 +0200
Gleb Natapov <gleb@xxxxxxxxxx> wrote:

> Yes, for guests that do not enable steal time KVM_REQ_STEAL_UPDATE
> should be never set, but currently it is. The patch (not tested) should
> fix this.

Nice!
	Takuya

> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 901ad00..01572f5 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1544,6 +1544,8 @@ static void accumulate_steal_time(struct kvm_vcpu *vcpu)
>  	delta = current->sched_info.run_delay - vcpu->arch.st.last_steal;
>  	vcpu->arch.st.last_steal = current->sched_info.run_delay;
>  	vcpu->arch.st.accum_steal = delta;
> +
> +	kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
>  }
>  
>  static void record_steal_time(struct kvm_vcpu *vcpu)
> @@ -1673,8 +1675,6 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
>  		accumulate_steal_time(vcpu);
>  		preempt_enable();
>  
> -		kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
> -
>  		break;
>  	case MSR_KVM_PV_EOI_EN:
>  		if (kvm_lapic_enable_pv_eoi(vcpu, data))
> @@ -2336,7 +2336,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>  	}
>  
>  	accumulate_steal_time(vcpu);
> -	kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
>  }
>  
>  void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
> --
> 			Gleb.
> --
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-- 
Takuya Yoshikawa <takuya.yoshikawa@xxxxxxxxx>
--
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