linux-kernel - Re: [PATCH v2 1/7] KVM: s390: clean up redundant 'kvm

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Message-ID: <71344f73-c34f-a373-49d1-5d839c6be5f6@linux.alibaba.com>
Date:   Thu, 23 Apr 2020 18:58:52 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Cornelia Huck <cohuck@...hat.com>
Cc:     Christian Borntraeger <borntraeger@...ibm.com>,
        pbonzini@...hat.com, tsbogend@...ha.franken.de, paulus@...abs.org,
        mpe@...erman.id.au, benh@...nel.crashing.org,
        frankja@...ux.ibm.com, david@...hat.com, heiko.carstens@...ibm.com,
        gor@...ux.ibm.com, sean.j.christopherson@...el.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, maz@...nel.org,
        james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, christoffer.dall@....com,
        peterx@...hat.com, thuth@...hat.com, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-mips@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] KVM: s390: clean up redundant 'kvm_run' parameters



On 2020/4/23 18:39, Cornelia Huck wrote:
> On Thu, 23 Apr 2020 11:01:43 +0800
> Tianjia Zhang <tianjia.zhang@...ux.alibaba.com> wrote:
> 
>> On 2020/4/23 0:04, Cornelia Huck wrote:
>>> On Wed, 22 Apr 2020 17:58:04 +0200
>>> Christian Borntraeger <borntraeger@...ibm.com> wrote:
>>>    
>>>> On 22.04.20 15:45, Cornelia Huck wrote:
>>>>> On Wed, 22 Apr 2020 20:58:04 +0800
>>>>> Tianjia Zhang <tianjia.zhang@...ux.alibaba.com> wrote:
>>>>>       
>>>>>> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
>>>>>> structure. Earlier than historical reasons, many kvm-related function
>>>>>
>>>>> s/Earlier than/For/ ?
>>>>>       
>>>>>> parameters retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time.
>>>>>> This patch does a unified cleanup of these remaining redundant parameters.
>>>>>>
>>>>>> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
>>>>>> ---
>>>>>>    arch/s390/kvm/kvm-s390.c | 37 ++++++++++++++++++++++---------------
>>>>>>    1 file changed, 22 insertions(+), 15 deletions(-)
>>>>>>
>>>>>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>>>>>> index e335a7e5ead7..d7bb2e7a07ff 100644
>>>>>> --- a/arch/s390/kvm/kvm-s390.c
>>>>>> +++ b/arch/s390/kvm/kvm-s390.c
>>>>>> @@ -4176,8 +4176,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
>>>>>>    	return rc;
>>>>>>    }
>>>>>>    
>>>>>> -static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>>>>>> +static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
>>>>>>    {
>>>>>> +	struct kvm_run *kvm_run = vcpu->run;
>>>>>>    	struct runtime_instr_cb *riccb;
>>>>>>    	struct gs_cb *gscb;
>>>>>>    
>>>>>> @@ -4235,7 +4236,7 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>>>>>>    		}
>>>>>>    		if (vcpu->arch.gs_enabled) {
>>>>>>    			current->thread.gs_cb = (struct gs_cb *)
>>>>>> -						&vcpu->run->s.regs.gscb;
>>>>>> +						&kvm_run->s.regs.gscb;
>>>>>
>>>>> Not sure if these changes (vcpu->run-> => kvm_run->) are really worth
>>>>> it. (It seems they amount to at least as much as the changes advertised
>>>>> in the patch description.)
>>>>>
>>>>> Other opinions?
>>>>
>>>> Agreed. It feels kind of random. Maybe just do the first line (move kvm_run from the
>>>> function parameter list into the variable declaration)? Not sure if this is better.
>>>>   
>>>
>>> There's more in this patch that I cut... but I think just moving
>>> kvm_run from the parameter list would be much less disruptive.
>>>    
>>
>> I think there are two kinds of code(`vcpu->run->` and `kvm_run->`), but
>> there will be more disruptive, not less.
> 
> I just fail to see the benefit; sure, kvm_run-> is convenient, but the
> current code is just fine, and any rework should be balanced against
> the cost (e.g. cluttering git annotate).
> 

cluttering git annotate ? Does it mean Fix xxxx ("comment"). Is it 
possible to solve this problem by splitting this patch?