linux-kernel - Re: [PATCH v2] KVM: Optimize kvm_arch_vcpu_ioctl

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Date:   Thu, 16 Apr 2020 17:08:51 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Cornelia Huck <cohuck@...hat.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...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, pbonzini@...hat.com,
        tsbogend@...ha.franken.de, paulus@...abs.org, mpe@...erman.id.au,
        benh@...nel.crashing.org, borntraeger@...ibm.com,
        frankja@...ux.ibm.com, david@...hat.com, heiko.carstens@...ibm.com,
        gor@...ux.ibm.com, sean.j.christopherson@...el.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, james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, christoffer.dall@....com,
        peterx@...hat.com, thuth@...hat.com
Subject: Re: [PATCH v2] KVM: Optimize kvm_arch_vcpu_ioctl_run function



On 2020/4/16 16:50, Cornelia Huck wrote:
> On Thu, 16 Apr 2020 16:45:33 +0800
> Tianjia Zhang <tianjia.zhang@...ux.alibaba.com> wrote:
> 
>> On 2020/4/16 16:28, Marc Zyngier wrote:
>>> On 2020-04-16 08:03, Vitaly Kuznetsov wrote:
>>>> Tianjia Zhang <tianjia.zhang@...ux.alibaba.com> writes:
>>>>   
>>>>> In earlier versions of kvm, 'kvm_run' is an independent structure
>>>>> and is not included in the vcpu structure. At present, 'kvm_run'
>>>>> is already included in the vcpu structure, so the parameter
>>>>> 'kvm_run' is redundant.
>>>>>
>>>>> This patch simplify the function definition, removes the extra
>>>>> 'kvm_run' parameter, and extract it from the 'kvm_vcpu' structure
>>>>> if necessary.
>>>>>
>>>>> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
>>>>> ---
>>>>>
>>>>> v2 change:
>>>>>    remove 'kvm_run' parameter and extract it from 'kvm_vcpu'
>>>>>
>>>>>   arch/mips/kvm/mips.c       |  3 ++-
>>>>>   arch/powerpc/kvm/powerpc.c |  3 ++-
>>>>>   arch/s390/kvm/kvm-s390.c   |  3 ++-
>>>>>   arch/x86/kvm/x86.c         | 11 ++++++-----
>>>>>   include/linux/kvm_host.h   |  2 +-
>>>>>   virt/kvm/arm/arm.c         |  6 +++---
>>>>>   virt/kvm/kvm_main.c        |  2 +-
>>>>>   7 files changed, 17 insertions(+), 13 deletions(-)
> 
>>> Overall, there is a large set of cleanups to be done when both the vcpu
>>> and the run
>>> structures are passed as parameters at the same time. Just grepping the
>>> tree for
>>> kvm_run is pretty instructive.
>>>
>>>           M.
>>
>> Sorry, it's my mistake, I only compiled the x86 platform, I will submit
>> patch again.
> 
> I think it's completely fine (and even preferable) to do cleanups like
> that on top.
> 
> [FWIW, I compiled s390 here.]
> 

Very good, I will do a comprehensive cleanup of this type of code.

Thanks,
Tianjia