KVM: SVM: introduce disable_nmi_singlestep helper

Just moving the code to a new helper in preparation for following
commits.
Signed-off-by: NLadi Prosek <lprosek@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm.c

@@ -963,6 +963,14 @@ static void svm_disable_lbrv(struct vcpu_svm *svm)
 	set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
 }
 
+static void disable_nmi_singlestep(struct vcpu_svm *svm)
+{
+	svm->nmi_singlestep = false;
+	if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
+		svm->vmcb->save.rflags &=
+			~(X86_EFLAGS_TF | X86_EFLAGS_RF);
+}
+
 /* Note:
  * This hash table is used to map VM_ID to a struct kvm_arch,
  * when handling AMD IOMMU GALOG notification to schedule in
@@ -2111,10 +2119,7 @@ static int db_interception(struct vcpu_svm *svm)
 	}
 
 	if (svm->nmi_singlestep) {
-		svm->nmi_singlestep = false;
-		if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
-			svm->vmcb->save.rflags &=
-				~(X86_EFLAGS_TF | X86_EFLAGS_RF);
+		disable_nmi_singlestep(svm);
 	}
 
 	if (svm->vcpu.guest_debug &