linux-kernel - Re: [PATCH 03/11] KVM: x86: Clean up kvm_vcpu_ioctl_x86_setup

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Date:   Thu, 2 Dec 2021 09:19:30 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     erdemaktas@...gle.com, Connor Kuehl <ckuehl@...hat.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        isaku.yamahata@...el.com, Kai Huang <kai.huang@...el.com>
Subject: Re: [PATCH 03/11] KVM: x86: Clean up kvm_vcpu_ioctl_x86_setup_mce()

Paolo,

Isaku is going to re-organize TDX KVM series based on your and tglx's 
comments. I'm not sure if it's good/correct to make this series 
separate. Maybe introduction of vm_type is better to sit at the very 
beginning of Isaku's next series. In that case, I think you can pick 
this cleanup patch separately?

Thanks,
-Xiaoyao

On 11/12/2021 11:37 PM, Xiaoyao Li wrote:
> No need to use goto.
> 
> Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
> ---
>   arch/x86/kvm/x86.c | 12 +++++-------
>   1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 23617582712d..b02088343d80 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -4505,15 +4505,13 @@ static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
>   static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
>   					u64 mcg_cap)
>   {
> -	int r;
>   	unsigned bank_num = mcg_cap & 0xff, bank;
>   
> -	r = -EINVAL;
>   	if (!bank_num || bank_num > KVM_MAX_MCE_BANKS)
> -		goto out;
> +		return -EINVAL;
>   	if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000))
> -		goto out;
> -	r = 0;
> +		return -EINVAL;
> +
>   	vcpu->arch.mcg_cap = mcg_cap;
>   	/* Init IA32_MCG_CTL to all 1s */
>   	if (mcg_cap & MCG_CTL_P)
> @@ -4523,8 +4521,8 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
>   		vcpu->arch.mce_banks[bank*4] = ~(u64)0;
>   
>   	static_call(kvm_x86_setup_mce)(vcpu);
> -out:
> -	return r;
> +
> +	return 0;
>   }
>   
>   static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
>