KVM: VMX: Stash kvm_vmx in a local variable for Hyper-V paravirt TLB flush

Capture kvm_vmx in a local variable instead of polluting
hv_remote_flush_tlb_with_range() with to_kvm_vmx(kvm).

No functional change intended.
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: <20210305183123.3978098-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/vmx.c

@@ -520,26 +520,27 @@ static inline int hv_remote_flush_eptp(u64 eptp, struct kvm_tlb_range *range)
 static int hv_remote_flush_tlb_with_range(struct kvm *kvm,
 		struct kvm_tlb_range *range)
 {
+	struct kvm_vmx *kvm_vmx = to_kvm_vmx(kvm);
 	struct kvm_vcpu *vcpu;
 	int ret = 0, i;
 
-	spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
+	spin_lock(&kvm_vmx->ept_pointer_lock);
 
-	if (to_kvm_vmx(kvm)->ept_pointers_match == EPT_POINTERS_CHECK)
+	if (kvm_vmx->ept_pointers_match == EPT_POINTERS_CHECK)
 		check_ept_pointer_match(kvm);
 
-	if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {
+	if (kvm_vmx->ept_pointers_match != EPT_POINTERS_MATCH) {
 		kvm_for_each_vcpu(i, vcpu, kvm) {
 			/* If ept_pointer is invalid pointer, bypass flush request. */
 			if (VALID_PAGE(to_vmx(vcpu)->ept_pointer))
 				ret |= hv_remote_flush_eptp(to_vmx(vcpu)->ept_pointer,
 							    range);
 		}
-	} else if (VALID_PAGE(to_kvm_vmx(kvm)->hv_tlb_eptp)) {
-		ret = hv_remote_flush_eptp(to_kvm_vmx(kvm)->hv_tlb_eptp, range);
+	} else if (VALID_PAGE(kvm_vmx->hv_tlb_eptp)) {
+		ret = hv_remote_flush_eptp(kvm_vmx->hv_tlb_eptp, range);
 	}
 
-	spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
+	spin_unlock(&kvm_vmx->ept_pointer_lock);
 	return ret;
 }
 static int hv_remote_flush_tlb(struct kvm *kvm)