linux-kernel - Re: [PATCH v10 2/9] KVM: x86: Add & use kvm_vcpu_is_legal

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Message-ID: <20230720235352.GH25699@ls.amr.corp.intel.com>
Date:   Thu, 20 Jul 2023 16:53:52 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Binbin Wu <binbin.wu@...ux.intel.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        seanjc@...gle.com, pbonzini@...hat.com, chao.gao@...el.com,
        kai.huang@...el.com, David.Laight@...LAB.COM,
        robert.hu@...ux.intel.com, guang.zeng@...el.com,
        isaku.yamahata@...il.com
Subject: Re: [PATCH v10 2/9] KVM: x86: Add & use kvm_vcpu_is_legal_cr3() to
 check CR3's legality

On Wed, Jul 19, 2023 at 10:41:24PM +0800,
Binbin Wu <binbin.wu@...ux.intel.com> wrote:

> Add and use kvm_vcpu_is_legal_cr3() to check CR3's legality to provide
> a clear distinction b/t CR3 and GPA checks. So that kvm_vcpu_is_legal_cr3()
> can be adjusted according to new feature(s).
> 
> No functional change intended.
> 
> Signed-off-by: Binbin Wu <binbin.wu@...ux.intel.com>
> ---
>  arch/x86/kvm/cpuid.h      | 5 +++++
>  arch/x86/kvm/svm/nested.c | 4 ++--
>  arch/x86/kvm/vmx/nested.c | 4 ++--
>  arch/x86/kvm/x86.c        | 4 ++--
>  4 files changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index f61a2106ba90..8b26d946f3e3 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -283,4 +283,9 @@ static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
>  	return vcpu->arch.governed_features.enabled & kvm_governed_feature_bit(x86_feature);
>  }
>  
> +static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
> +{
> +	return kvm_vcpu_is_legal_gpa(vcpu, cr3);
> +}
> +

The remaining user of kvm_vcpu_is_illegal_gpa() is one left.  Can we remove it
by replacing !kvm_vcpu_is_legal_gpa()?
-- 
Isaku Yamahata <isaku.yamahata@...il.com>