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

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Message-ID: <20200416105019.51191d79.cohuck@redhat.com>
Date:   Thu, 16 Apr 2020 10:50:19 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.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 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.]