linux-kernel - [PATCH v2 20/25] KVM: x86/mmu: pull CPU mode computation to kvm_init

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Date:   Mon, 21 Feb 2022 11:22:38 -0500
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     dmatlack@...gle.com, seanjc@...gle.com
Subject: [PATCH v2 20/25] KVM: x86/mmu: pull CPU mode computation to kvm_init_mmu

Do not lead init_kvm_*mmu into the temptation of poking
into struct kvm_mmu_role_regs, by passing to it directly
the CPU mode.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu/mmu.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 47288643ab70..a7028c2ae5c7 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4734,11 +4734,9 @@ kvm_calc_tdp_mmu_root_page_role(struct kvm_vcpu *vcpu,
 	return role;
 }
 
-static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu,
-			     const struct kvm_mmu_role_regs *regs)
+static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu, union kvm_mmu_paging_mode cpu_mode)
 {
 	struct kvm_mmu *context = &vcpu->arch.root_mmu;
-	union kvm_mmu_paging_mode cpu_mode = kvm_calc_cpu_mode(vcpu, regs);
 	union kvm_mmu_page_role root_role = kvm_calc_tdp_mmu_root_page_role(vcpu, cpu_mode);
 
 	if (cpu_mode.as_u64 == context->cpu_mode.as_u64 &&
@@ -4794,10 +4792,9 @@ static void shadow_mmu_init_context(struct kvm_vcpu *vcpu, struct kvm_mmu *conte
 }
 
 static void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu,
-				const struct kvm_mmu_role_regs *regs)
+				union kvm_mmu_paging_mode cpu_mode)
 {
 	struct kvm_mmu *context = &vcpu->arch.root_mmu;
-	union kvm_mmu_paging_mode cpu_mode = kvm_calc_cpu_mode(vcpu, regs);
 	union kvm_mmu_page_role root_role;
 
 	root_role = cpu_mode.base;
@@ -4895,20 +4892,19 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
 EXPORT_SYMBOL_GPL(kvm_init_shadow_ept_mmu);
 
 static void init_kvm_softmmu(struct kvm_vcpu *vcpu,
-			     const struct kvm_mmu_role_regs *regs)
+			     union kvm_mmu_paging_mode cpu_mode)
 {
 	struct kvm_mmu *context = &vcpu->arch.root_mmu;
 
-	kvm_init_shadow_mmu(vcpu, regs);
+	kvm_init_shadow_mmu(vcpu, cpu_mode);
 
 	context->get_guest_pgd	   = kvm_get_guest_cr3;
 	context->get_pdptr         = kvm_pdptr_read;
 	context->inject_page_fault = kvm_inject_page_fault_shadow;
 }
 
-static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu, const struct kvm_mmu_role_regs *regs)
+static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu, union kvm_mmu_paging_mode new_mode)
 {
-	union kvm_mmu_paging_mode new_mode = kvm_calc_cpu_mode(vcpu, regs);
 	struct kvm_mmu *g_context = &vcpu->arch.nested_mmu;
 
 	if (new_mode.as_u64 == g_context->cpu_mode.as_u64)
@@ -4949,13 +4945,14 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu, const struct kvm_mmu_role
 void kvm_init_mmu(struct kvm_vcpu *vcpu)
 {
 	struct kvm_mmu_role_regs regs = vcpu_to_role_regs(vcpu);
+	union kvm_mmu_paging_mode cpu_mode = kvm_calc_cpu_mode(vcpu, &regs);
 
 	if (mmu_is_nested(vcpu))
-		init_kvm_nested_mmu(vcpu, &regs);
+		init_kvm_nested_mmu(vcpu, cpu_mode);
 	else if (tdp_enabled)
-		init_kvm_tdp_mmu(vcpu, &regs);
+		init_kvm_tdp_mmu(vcpu, cpu_mode);
 	else
-		init_kvm_softmmu(vcpu, &regs);
+		init_kvm_softmmu(vcpu, cpu_mode);
 }
 EXPORT_SYMBOL_GPL(kvm_init_mmu);
 
-- 
2.31.1