linux-kernel - Re: [PATCH v13 10/30] LoongArch: KVM: Implement vcpu ENABLE

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Date:   Tue, 13 Jun 2023 20:57:30 +0800
From:   "bibo, mao" <bibo.mao@...il.com>
To:     Tianrui Zhao <zhaotianrui@...ngson.cn>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
        Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Xi Ruoyao <xry111@...111.site>, tangyouling@...ngson.cn,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v13 10/30] LoongArch: KVM: Implement vcpu ENABLE_CAP ioctl
 interface

Reviewed-by: Bibo Mao <maobibo@...ngson.cn>

Regards
Bibo, Mao

在 2023/6/9 17:08, Tianrui Zhao 写道:
> Implement LoongArch vcpu KVM_ENABLE_CAP ioctl interface.
> 
> Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
> ---
>   arch/loongarch/kvm/vcpu.c | 19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
> 
> diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
> index b0cce413762d..da97b77da8eb 100644
> --- a/arch/loongarch/kvm/vcpu.c
> +++ b/arch/loongarch/kvm/vcpu.c
> @@ -186,6 +186,16 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
>   	return 0;
>   }
>   
> +static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
> +				     struct kvm_enable_cap *cap)
> +{
> +	/*
> +	 * FPU is enable by default, do not support any other caps,
> +	 * and later we will support such as LSX cap.
> +	 */
> +	return -EINVAL;
> +}
> +
>   long kvm_arch_vcpu_ioctl(struct file *filp,
>   			 unsigned int ioctl, unsigned long arg)
>   {
> @@ -209,6 +219,15 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
>   			r = _kvm_get_reg(vcpu, &reg);
>   		break;
>   	}
> +	case KVM_ENABLE_CAP: {
> +		struct kvm_enable_cap cap;
> +
> +		r = -EFAULT;
> +		if (copy_from_user(&cap, argp, sizeof(cap)))
> +			break;
> +		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
> +		break;
> +	}
>   	default:
>   		r = -ENOIOCTLCMD;
>   		break;