KVM: X86: Add parameter huge_page_level to kvm_init_shadow_ept_mmu()

The level of supported large page on nEPT affects the rsvds_bits_mask.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211124122055.64424-8-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu.h

@@ -71,7 +71,8 @@ void kvm_init_mmu(struct kvm_vcpu *vcpu);
 void kvm_init_shadow_npt_mmu(struct kvm_vcpu *vcpu, unsigned long cr0,
 			     unsigned long cr4, u64 efer, gpa_t nested_cr3);
 void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
-			     bool accessed_dirty, gpa_t new_eptp);
+			     int huge_page_level, bool accessed_dirty,
+			     gpa_t new_eptp);
 bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu);
 int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
 				u64 fault_address, char *insn, int insn_len);

arch/x86/kvm/mmu/mmu.c

@@ -4905,7 +4905,8 @@ kvm_calc_shadow_ept_root_page_role(struct kvm_vcpu *vcpu, bool accessed_dirty,
 }
 
 void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
-			     bool accessed_dirty, gpa_t new_eptp)
+			     int huge_page_level, bool accessed_dirty,
+			     gpa_t new_eptp)
 {
 	struct kvm_mmu *context = &vcpu->arch.guest_mmu;
 	u8 level = vmx_eptp_page_walk_level(new_eptp);
@@ -4932,7 +4933,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
 
 	update_permission_bitmask(context, true);
 	context->pkru_mask = 0;
-	reset_rsvds_bits_mask_ept(vcpu, context, execonly, max_huge_page_level);
+	reset_rsvds_bits_mask_ept(vcpu, context, execonly, huge_page_level);
 	reset_ept_shadow_zero_bits_mask(vcpu, context, execonly);
 }
 EXPORT_SYMBOL_GPL(kvm_init_shadow_ept_mmu);

arch/x86/kvm/vmx/capabilities.h

@@ -312,6 +312,15 @@ static inline bool cpu_has_vmx_ept_1g_page(void)
 	return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
 }
 
+static inline int ept_caps_to_lpage_level(u32 ept_caps)
+{
+	if (ept_caps & VMX_EPT_1GB_PAGE_BIT)
+		return PG_LEVEL_1G;
+	if (ept_caps & VMX_EPT_2MB_PAGE_BIT)
+		return PG_LEVEL_2M;
+	return PG_LEVEL_4K;
+}
+
 static inline bool cpu_has_vmx_ept_ad_bits(void)
 {
 	return vmx_capability.ept & VMX_EPT_AD_BIT;

arch/x86/kvm/vmx/nested.c

@@ -397,9 +397,11 @@ static void nested_ept_inject_page_fault(struct kvm_vcpu *vcpu,
 
 static void nested_ept_new_eptp(struct kvm_vcpu *vcpu)
 {
-	kvm_init_shadow_ept_mmu(vcpu,
-				to_vmx(vcpu)->nested.msrs.ept_caps &
-				VMX_EPT_EXECUTE_ONLY_BIT,
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	bool execonly = vmx->nested.msrs.ept_caps & VMX_EPT_EXECUTE_ONLY_BIT;
+	int ept_lpage_level = ept_caps_to_lpage_level(vmx->nested.msrs.ept_caps);
+
+	kvm_init_shadow_ept_mmu(vcpu, execonly, ept_lpage_level,
 				nested_ept_ad_enabled(vcpu),
 				nested_ept_get_eptp(vcpu));
 }