linux-kernel - Re: [PATCH v2 2/4] KVM: X86: implement the logic for spinlock optimization

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Date:   Tue, 8 Aug 2017 10:39:09 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Longpeng (Mike)" <longpeng2@...wei.com>
Cc:     rkrcmar@...hat.com, 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 2/4] KVM: X86: implement the logic for spinlock
 optimization

On 08/08/2017 10:31, Longpeng (Mike) wrote:
> 
> 
> On 2017/8/8 15:30, Paolo Bonzini wrote:
> 
>> On 08/08/2017 06:05, Longpeng(Mike) wrote:
>>> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
>>> index cd0e6e6..dec5e8a 100644
>>> --- a/arch/x86/kvm/hyperv.c
>>> +++ b/arch/x86/kvm/hyperv.c
>>> @@ -1268,7 +1268,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
>>>  
>>>  	switch (code) {
>>>  	case HVCALL_NOTIFY_LONG_SPIN_WAIT:
>>> -		kvm_vcpu_on_spin(vcpu, kvm_arch_vcpu_in_kernel(vcpu));
>>> +		kvm_vcpu_on_spin(vcpu, kvm_x86_ops->spin_in_kernel(vcpu));
>>>  		break;
>>>  	case HVCALL_POST_MESSAGE:
>>>  	case HVCALL_SIGNAL_EVENT:
>>
>> This can be true as well.  I can change this on commit.
> 
> Thanks,
> hope you could help me to fix the same problem in patch-1(s390) too.

Yes.  Another possibility is to always pass false in patch 1 to
kvm_vcpu_on_spin.  Then the parameter can be adjusted in patches 3 and 4
(passing true for s390 and vcpu_mode_priv(vcpu) for ARM).

Paolo