linux-kernel - Re: [PATCH v2 1/4] KVM: add spinlock optimization framework

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Date:   Tue, 8 Aug 2017 09:34:14 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Longpeng(Mike)" <longpeng2@...wei.com>, rkrcmar@...hat.com
Cc:     agraf@...e.com, borntraeger@...ibm.com, cohuck@...hat.com,
        christoffer.dall@...aro.org, marc.zyngier@....com,
        james.hogan@...tec.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, weidong.huang@...wei.com,
        arei.gonglei@...wei.com, wangxinxin.wang@...wei.com,
        longpeng.mike@...il.com, david@...hat.com
Subject: Re: [PATCH v2 1/4] KVM: add spinlock optimization framework

On 08/08/2017 06:05, Longpeng(Mike) wrote:
>  	return 1;
> diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c
> index ce865bd..4ea8c38 100644
> --- a/arch/s390/kvm/diag.c
> +++ b/arch/s390/kvm/diag.c
> @@ -150,7 +150,7 @@ static int __diag_time_slice_end(struct kvm_vcpu *vcpu)
>  {
>  	VCPU_EVENT(vcpu, 5, "%s", "diag time slice end");
>  	vcpu->stat.diagnose_44++;
> -	kvm_vcpu_on_spin(vcpu);
> +	kvm_vcpu_on_spin(vcpu, kvm_arch_vcpu_in_kernel(vcpu));
>  	return 0;
>  }
>  

IIUC, diag is a privileged instruction so this an also be "true".

Paolo