linux-kernel - Re: [PATCH v3 4/5] KVM: MMU: Add 5 level EPT & Shadow page table support.

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Date:   Thu, 24 Aug 2017 15:42:34 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Yu Zhang <yu.c.zhang@...ux.intel.com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, rkrcmar@...hat.com,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        xiaoguangrong@...cent.com, joro@...tes.org
Subject: Re: [PATCH v3 4/5] KVM: MMU: Add 5 level EPT & Shadow page table
 support.

On 24/08/2017 14:27, Yu Zhang wrote:
>  	/* Update physical-address width */
>  	vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
>  
> +#ifdef CONFIG_X86_64
> +	if (vcpu->arch.maxphyaddr > 48)
> +		kvm_mmu_reset_context(vcpu);
> +#endif

I think CONFIG_X86_64 is not necessary to have maxphyaddr>48?

Paolo

>  	kvm_pmu_refresh(vcpu);
>  	return 0;
>  }