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Date:   Fri, 4 Feb 2022 19:41:23 +0000
From:   David Matlack <dmatlack@google.com>
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        seanjc@google.com, vkuznets@redhat.com
Subject: Re: [PATCH 09/23] KVM: MMU: remove "bool base_only" arguments
Message-ID: <Yf2BY7d8TsmNrceY@google.com>
References: <20220204115718.14934-1-pbonzini@redhat.com>
 <20220204115718.14934-10-pbonzini@redhat.com>
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On Fri, Feb 04, 2022 at 06:57:04AM -0500, Paolo Bonzini wrote:
> The argument is always false now that kvm_mmu_calc_root_page_role has
> been removed.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  arch/x86/kvm/mmu/mmu.c | 63 +++++++++++++++---------------------------
>  1 file changed, 22 insertions(+), 41 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 42475e4c2a48..dd69cfc8c4f6 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -4658,46 +4658,30 @@ static void paging32_init_context(struct kvm_mmu *context)
>  	context->direct_map = false;
>  }
>  
> -static union kvm_mmu_extended_role kvm_calc_mmu_role_ext(struct kvm_vcpu *vcpu,
> -							 const struct kvm_mmu_role_regs *regs)
> -{
> -	union kvm_mmu_extended_role ext = {0};
> -
> -	if (____is_cr0_pg(regs)) {
> -		ext.cr0_pg = 1;
> -		ext.cr4_pae = ____is_cr4_pae(regs);
> -		ext.cr4_smep = ____is_cr4_smep(regs);
> -		ext.cr4_smap = ____is_cr4_smap(regs);
> -		ext.cr4_pse = ____is_cr4_pse(regs);
> -
> -		/* PKEY and LA57 are active iff long mode is active. */
> -		ext.cr4_pke = ____is_efer_lma(regs) && ____is_cr4_pke(regs);
> -		ext.cr4_la57 = ____is_efer_lma(regs) && ____is_cr4_la57(regs);
> -		ext.efer_lma = ____is_efer_lma(regs);
> -	}
> -
> -	return ext;
> -}
> -
>  static union kvm_mmu_role kvm_calc_mmu_role_common(struct kvm_vcpu *vcpu,
> -						   const struct kvm_mmu_role_regs *regs,
> -						   bool base_only)
> +						   const struct kvm_mmu_role_regs *regs)
>  {
>  	union kvm_mmu_role role = {0};
>  
>  	role.base.access = ACC_ALL;
>  	if (____is_cr0_pg(regs)) {
> +		role.ext.cr0_pg = 1;
>  		role.base.efer_nx = ____is_efer_nx(regs);
>  		role.base.cr0_wp = ____is_cr0_wp(regs);
> +
> +		role.ext.cr4_pae = ____is_cr4_pae(regs);
> +		role.ext.cr4_smep = ____is_cr4_smep(regs);
> +		role.ext.cr4_smap = ____is_cr4_smap(regs);
> +		role.ext.cr4_pse = ____is_cr4_pse(regs);
> +
> +		/* PKEY and LA57 are active iff long mode is active. */
> +		role.ext.cr4_pke = ____is_efer_lma(regs) && ____is_cr4_pke(regs);
> +		role.ext.cr4_la57 = ____is_efer_lma(regs) && ____is_cr4_la57(regs);
> +		role.ext.efer_lma = ____is_efer_lma(regs);
>  	}
>  	role.base.smm = is_smm(vcpu);
>  	role.base.guest_mode = is_guest_mode(vcpu);
>  
> -	if (base_only)
> -		return role;
> -
> -	role.ext = kvm_calc_mmu_role_ext(vcpu, regs);
> -
>  	return role;
>  }
>  
> @@ -4716,10 +4700,9 @@ static inline int kvm_mmu_get_tdp_level(struct kvm_vcpu *vcpu)
>  
>  static union kvm_mmu_role
>  kvm_calc_tdp_mmu_root_page_role(struct kvm_vcpu *vcpu,
> -				const struct kvm_mmu_role_regs *regs,
> -				bool base_only)
> +				const struct kvm_mmu_role_regs *regs)
>  {
> -	union kvm_mmu_role role = kvm_calc_mmu_role_common(vcpu, regs, base_only);
> +	union kvm_mmu_role role = kvm_calc_mmu_role_common(vcpu, regs);
>  
>  	role.base.ad_disabled = (shadow_accessed_mask == 0);
>  	role.base.level = kvm_mmu_get_tdp_level(vcpu);
> @@ -4734,7 +4717,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu,
>  {
>  	struct kvm_mmu *context = &vcpu->arch.root_mmu;
>  	union kvm_mmu_role new_role =
> -		kvm_calc_tdp_mmu_root_page_role(vcpu, regs, false);
> +		kvm_calc_tdp_mmu_root_page_role(vcpu, regs);
>  
>  	if (new_role.as_u64 == context->mmu_role.as_u64)
>  		return;
> @@ -4763,10 +4746,9 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu,
>  
>  static union kvm_mmu_role
>  kvm_calc_shadow_root_page_role_common(struct kvm_vcpu *vcpu,
> -				      const struct kvm_mmu_role_regs *regs,
> -				      bool base_only)
> +				      const struct kvm_mmu_role_regs *regs)
>  {
> -	union kvm_mmu_role role = kvm_calc_mmu_role_common(vcpu, regs, base_only);
> +	union kvm_mmu_role role = kvm_calc_mmu_role_common(vcpu, regs);
>  
>  	role.base.smep_andnot_wp = role.ext.cr4_smep && !____is_cr0_wp(regs);
>  	role.base.smap_andnot_wp = role.ext.cr4_smap && !____is_cr0_wp(regs);
> @@ -4777,11 +4759,10 @@ kvm_calc_shadow_root_page_role_common(struct kvm_vcpu *vcpu,
>  
>  static union kvm_mmu_role
>  kvm_calc_shadow_mmu_root_page_role(struct kvm_vcpu *vcpu,
> -				   const struct kvm_mmu_role_regs *regs,
> -				   bool base_only)
> +				   const struct kvm_mmu_role_regs *regs)
>  {
>  	union kvm_mmu_role role =
> -		kvm_calc_shadow_root_page_role_common(vcpu, regs, base_only);
> +		kvm_calc_shadow_root_page_role_common(vcpu, regs);
>  
>  	role.base.direct = !____is_cr0_pg(regs);
>  
> @@ -4821,7 +4802,7 @@ static void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu,
>  {
>  	struct kvm_mmu *context = &vcpu->arch.root_mmu;
>  	union kvm_mmu_role new_role =
> -		kvm_calc_shadow_mmu_root_page_role(vcpu, regs, false);
> +		kvm_calc_shadow_mmu_root_page_role(vcpu, regs);
>  
>  	shadow_mmu_init_context(vcpu, context, regs, new_role);
>  
> @@ -4841,7 +4822,7 @@ kvm_calc_shadow_npt_root_page_role(struct kvm_vcpu *vcpu,
>  				   const struct kvm_mmu_role_regs *regs)
>  {
>  	union kvm_mmu_role role =
> -		kvm_calc_shadow_root_page_role_common(vcpu, regs, false);
> +		kvm_calc_shadow_root_page_role_common(vcpu, regs);
>  
>  	role.base.direct = false;
>  	role.base.level = kvm_mmu_get_tdp_level(vcpu);
> @@ -4937,7 +4918,7 @@ kvm_calc_nested_mmu_role(struct kvm_vcpu *vcpu, const struct kvm_mmu_role_regs *
>  {
>  	union kvm_mmu_role role;
>  
> -	role = kvm_calc_shadow_root_page_role_common(vcpu, regs, false);
> +	role = kvm_calc_shadow_root_page_role_common(vcpu, regs);
>  
>  	/*
>  	 * Nested MMUs are used only for walking L2's gva->gpa, they never have
> -- 
> 2.31.1
> 
>