KVM: VMX: Define Hyper-V paravirt TLB flush fields iff Hyper-V is enabled

Ifdef away the Hyper-V specific fields in structs kvm_vmx and vcpu_vmx
as each field has only a single reference outside of the struct itself
that isn't already wrapped in ifdeffery (and both are initialization).

vcpu_vmx.ept_pointer in particular should be wrapped as it is valid if
and only if Hyper-v is active, i.e. non-Hyper-V code cannot rely on it
to actually track the current EPTP (without additional code changes).
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210305183123.3978098-10-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/vmx.c

@@ -6920,8 +6920,9 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
 	vmx->pi_desc.nv = POSTED_INTR_VECTOR;
 	vmx->pi_desc.sn = 1;
 
+#if IS_ENABLED(CONFIG_HYPERV)
 	vmx->ept_pointer = INVALID_PAGE;
-
+#endif
 	return 0;
 
 free_vmcs:
@@ -6938,7 +6939,9 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
 
 static int vmx_vm_init(struct kvm *kvm)
 {
+#if IS_ENABLED(CONFIG_HYPERV)
 	spin_lock_init(&to_kvm_vmx(kvm)->ept_pointer_lock);
+#endif
 
 	if (!ple_gap)
 		kvm->arch.pause_in_guest = true;

arch/x86/kvm/vmx/vmx.h

@@ -325,7 +325,9 @@ struct vcpu_vmx {
 	 */
 	u64 msr_ia32_feature_control;
 	u64 msr_ia32_feature_control_valid_bits;
+#if IS_ENABLED(CONFIG_HYPERV)
 	u64 ept_pointer;
+#endif
 
 	struct pt_desc pt_desc;
 	struct lbr_desc lbr_desc;
@@ -345,8 +347,10 @@ struct kvm_vmx {
 	bool ept_identity_pagetable_done;
 	gpa_t ept_identity_map_addr;
 
+#if IS_ENABLED(CONFIG_HYPERV)
 	hpa_t hv_tlb_eptp;
 	spinlock_t ept_pointer_lock;
+#endif
 };
 
 bool nested_vmx_allowed(struct kvm_vcpu *vcpu);