Subject: Re: [PATCH v2 1/7] KVM: s390: clean up redundant 'kvm_run' parameters

From: Cornelia Huck <[email-masked]>
Date: Wed, 22 Apr 2020 15:45:43 +0200

On Wed, 22 Apr 2020 20:58:04 +0800
Tianjia Zhang <[email-masked]> 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 <[email-masked]>
> ---
>  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?

>  			restore_gs_cb(current->thread.gs_cb);
>  		}
>  		preempt_enable();