linux-kernel - Re: [RFC PATCH 2/3] kvm: Add accessors for guest CPU's family, model, stepping

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Date:	Wed, 18 Nov 2015 12:10:39 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Borislav Petkov <bp@...en8.de>, LKML <linux-kernel@...r.kernel.org>
Cc:	X86 ML <x86@...nel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [RFC PATCH 2/3] kvm: Add accessors for guest CPU's family, model,
 stepping



On 14/11/2015 11:37, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> Those give the family, model and stepping of the guest vcpu.
> 
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/cpuid.h | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index 06332cb7e7d1..5d47e0d95ef1 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -2,6 +2,7 @@
>  #define ARCH_X86_KVM_CPUID_H
>  
>  #include "x86.h"
> +#include <asm/cpu.h>
>  
>  int kvm_update_cpuid(struct kvm_vcpu *vcpu);
>  struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
> @@ -170,4 +171,37 @@ static inline bool guest_cpuid_has_nrips(struct kvm_vcpu *vcpu)
>  }
>  #undef BIT_NRIPS
>  
> +static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
> +{
> +	struct kvm_cpuid_entry2 *best;
> +
> +	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
> +	if (!best)
> +		return -1;
> +
> +	return x86_family(best->eax);
> +}
> +
> +static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
> +{
> +	struct kvm_cpuid_entry2 *best;
> +
> +	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
> +	if (!best)
> +		return -1;
> +
> +	return x86_model(best->eax);
> +}
> +
> +static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
> +{
> +	struct kvm_cpuid_entry2 *best;
> +
> +	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
> +	if (!best)
> +		return -1;
> +
> +	return x86_stepping(best->eax);
> +}
> +
>  #endif
> 

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