linux-kernel - Re: [PATCH v2 1/3] KVM: nSVM: split kvm_init_shadow_npt_mmu() from kvm_init_shadow

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Date:   Wed, 8 Jul 2020 13:25:06 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] KVM: nSVM: split kvm_init_shadow_npt_mmu() from
 kvm_init_shadow_mmu()

On 08/07/20 11:36, Vitaly Kuznetsov wrote:
> @@ -4973,7 +4969,28 @@ void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, u32 cr0, u32 cr4, u32 efer)
>  	context->mmu_role.as_u64 = new_role.as_u64;
>  	reset_shadow_zero_bits_mask(vcpu, context);
>  }
> -EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu);
> +
> +static void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, u32 cr0, u32 cr4, u32 efer)
> +{
> +	struct kvm_mmu *context = vcpu->arch.mmu;
> +	union kvm_mmu_role new_role =
> +		kvm_calc_shadow_mmu_root_page_role(vcpu, false);
> +
> +	if (new_role.as_u64 != context->mmu_role.as_u64)
> +		shadow_mmu_init_context(vcpu, cr0, cr4, efer, new_role);
> +}
> +
> +void kvm_init_shadow_npt_mmu(struct kvm_vcpu *vcpu, u32 cr0, u32 cr4, u32 efer,
> +			     gpa_t nested_cr3)
> +{
> +	struct kvm_mmu *context = vcpu->arch.mmu;
> +	union kvm_mmu_role new_role =
> +		kvm_calc_shadow_mmu_root_page_role(vcpu, false);
> +
> +	if (new_role.as_u64 != context->mmu_role.as_u64)
> +		shadow_mmu_init_context(vcpu, cr0, cr4, efer, new_role);
> +}
> +EXPORT_SYMBOL_GPL(kvm_init_shadow_npt_mmu);
>  
>  static union kvm_mmu_role

As a follow up, the assignments to context should stop using
vcpu->arch.mmu in favor of root_mmu/guest_mmu.

Paolo