KVM: x86: Specify max TDP level via kvm_configure_mmu()

Capture the max TDP level during kvm_configure_mmu() instead of using a
kvm_x86_ops hook to do it at every vCPU creation.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200716034122.5998-10-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -1133,7 +1133,6 @@ struct kvm_x86_ops {
 	int (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
 	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 	int (*set_identity_map_addr)(struct kvm *kvm, u64 ident_addr);
-	int (*get_max_tdp_level)(void);
 	u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
 
 	void (*load_mmu_pgd)(struct kvm_vcpu *vcpu, unsigned long pgd,
@@ -1509,7 +1508,8 @@ void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid);
 void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd, bool skip_tlb_flush,
 		     bool skip_mmu_sync);
 
-void kvm_configure_mmu(bool enable_tdp, int tdp_page_level);
+void kvm_configure_mmu(bool enable_tdp, int tdp_max_root_level,
+		       int tdp_huge_page_level);
 
 static inline u16 kvm_read_ldt(void)
 {

arch/x86/kvm/mmu/mmu.c

@@ -93,6 +93,7 @@ module_param_named(flush_on_reuse, force_flush_and_sync_on_reuse, bool, 0644);
 bool tdp_enabled = false;
 
 static int max_huge_page_level __read_mostly;
+static int max_tdp_level __read_mostly;
 
 enum {
 	AUDIT_PRE_PAGE_FAULT,
@@ -4849,10 +4850,10 @@ static union kvm_mmu_role kvm_calc_mmu_role_common(struct kvm_vcpu *vcpu,
 static inline int kvm_mmu_get_tdp_level(struct kvm_vcpu *vcpu)
 {
 	/* Use 5-level TDP if and only if it's useful/necessary. */
-	if (vcpu->arch.max_tdp_level == 5 && cpuid_maxphyaddr(vcpu) <= 48)
+	if (max_tdp_level == 5 && cpuid_maxphyaddr(vcpu) <= 48)
 		return 4;
 
-	return vcpu->arch.max_tdp_level;
+	return max_tdp_level;
 }
 
 static union kvm_mmu_role
@@ -5580,9 +5581,11 @@ void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid)
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_invpcid_gva);
 
-void kvm_configure_mmu(bool enable_tdp, int tdp_huge_page_level)
+void kvm_configure_mmu(bool enable_tdp, int tdp_max_root_level,
+		       int tdp_huge_page_level)
 {
 	tdp_enabled = enable_tdp;
+	max_tdp_level = tdp_max_root_level;
 
 	/*
 	 * max_huge_page_level reflects KVM's MMU capabilities irrespective

arch/x86/kvm/svm/svm.c

@@ -885,7 +885,7 @@ static __init int svm_hardware_setup(void)
 	if (npt_enabled && !npt)
 		npt_enabled = false;
 
-	kvm_configure_mmu(npt_enabled, PG_LEVEL_1G);
+	kvm_configure_mmu(npt_enabled, get_max_npt_level(), PG_LEVEL_1G);
 	pr_info("kvm: Nested Paging %sabled\n", npt_enabled ? "en" : "dis");
 
 	if (nrips) {
@@ -4109,7 +4109,6 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 
 	.set_tss_addr = svm_set_tss_addr,
 	.set_identity_map_addr = svm_set_identity_map_addr,
-	.get_max_tdp_level = get_max_npt_level,
 	.get_mt_mask = svm_get_mt_mask,
 
 	.get_exit_info = svm_get_exit_info,

arch/x86/kvm/vmx/vmx.c

@@ -7959,7 +7959,6 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 
 	.set_tss_addr = vmx_set_tss_addr,
 	.set_identity_map_addr = vmx_set_identity_map_addr,
-	.get_max_tdp_level = vmx_get_max_tdp_level,
 	.get_mt_mask = vmx_get_mt_mask,
 
 	.get_exit_info = vmx_get_exit_info,
@@ -8110,7 +8109,7 @@ static __init int hardware_setup(void)
 		ept_lpage_level = PG_LEVEL_2M;
 	else
 		ept_lpage_level = PG_LEVEL_4K;
-	kvm_configure_mmu(enable_ept, ept_lpage_level);
+	kvm_configure_mmu(enable_ept, vmx_get_max_tdp_level(), ept_lpage_level);
 
 	/*
 	 * Only enable PML when hardware supports PML feature, and both EPT

arch/x86/kvm/x86.c

@@ -9520,7 +9520,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	fx_init(vcpu);
 
 	vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
-	vcpu->arch.max_tdp_level = kvm_x86_ops.get_max_tdp_level();
 
 	vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;