linux-kernel - Re: [PATCH RESEND v5 1/2] KVM: X86: Introduce kvm_get_msr

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Message-ID: <38179d9e-537a-f002-a98d-5b48b10a4ea9@redhat.com>
Date:   Wed, 28 Feb 2018 07:54:45 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Liran Alon <liran.alon@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH RESEND v5 1/2] KVM: X86: Introduce kvm_get_msr_feature()

On 28/02/2018 07:03, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@...cent.com>
> 
> Introduce kvm_get_msr_feature() to handle the msrs which are supported 
> by different vendors and sharing the same emulation logic.
> 
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Cc: Liran Alon <liran.alon@...cle.com>
> Cc: Nadav Amit <nadav.amit@...il.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> ---
>  arch/x86/kvm/x86.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index d4985a9..efc8554 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1062,13 +1062,25 @@ static u32 msr_based_features[] = {
>  
>  static unsigned int num_msr_based_features;
>  
> +static int kvm_get_msr_feature(struct kvm_msr_entry *msr)
> +{
> +	switch (msr->index) {
> +	default:
> +		if (kvm_x86_ops->get_msr_feature(msr))
> +			return 1;
> +	}
> +	return 0;
> +}
> +
>  static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
>  {
>  	struct kvm_msr_entry msr;
> +	int r;
>  
>  	msr.index = index;
> -	if (kvm_x86_ops->get_msr_feature(&msr))
> -		return 1;
> +	r = kvm_get_msr_feature(&msr);
> +	if (r)
> +		return r;
>  
>  	*data = msr.data;
>  
> @@ -4538,7 +4550,7 @@ static void kvm_init_msr_list(void)
>  		struct kvm_msr_entry msr;
>  
>  		msr.index = msr_based_features[i];
> -		if (kvm_x86_ops->get_msr_feature(&msr))
> +		if (kvm_get_msr_feature(&msr))
>  			continue;
>  
>  		if (j < i)
> 

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>