linux-kernel - Re: [RFC PATCH 2/3] KVM: x86: Generate set of VMX feature MSRs using first/last definitions

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Date:   Wed, 10 Aug 2022 14:52:11 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Like Xu <like.xu.linux@...il.com>
Subject: Re: [RFC PATCH 2/3] KVM: x86: Generate set of VMX feature MSRs using
 first/last definitions

On 8/5/22 19:29, Sean Christopherson wrote:
>   
> +static void kvm_proble_feature_msr(u32 msr_index)
> +{
> +	struct kvm_msr_entry msr = {
> +		.index = msr_index,
> +	};
> +
> +	if (kvm_get_msr_feature(&msr))
> +		return;
> +
> +	msr_based_features[num_msr_based_features++] = msr_index;
> +}
> +
>   static void kvm_init_msr_list(void)
>   {
>   	u32 dummy[2];
> @@ -6954,15 +6949,11 @@ static void kvm_init_msr_list(void)
>   		emulated_msrs[num_emulated_msrs++] = emulated_msrs_all[i];
>   	}
>   
> -	for (i = 0; i < ARRAY_SIZE(msr_based_features_all); i++) {
> -		struct kvm_msr_entry msr;
> +	for (i = KVM_FIRST_EMULATED_VMX_MSR; i <= KVM_LAST_EMULATED_VMX_MSR; i++)
> +		kvm_proble_feature_msr(i);
>   
> -		msr.index = msr_based_features_all[i];
> -		if (kvm_get_msr_feature(&msr))
> -			continue;
> -
> -		msr_based_features[num_msr_based_features++] = msr_based_features_all[i];
> -	}
> +	for (i = 0; i < ARRAY_SIZE(msr_based_features_all_except_vmx); i++)
> +		kvm_proble_feature_msr(msr_based_features_all_except_vmx[i]);

I'd rather move all the code to a new function 
kvm_init_feature_msr_list() instead, and call it from 
kvm_arch_hardware_setup().

Thanks,

paolo