netbox/netbox/templates/virtualization/virtualdisk.html

{% extends 'generic/object.html' %}
{% load helpers %}
{% load plugins %}
{% load render_table from django_tables2 %}
{% load i18n %}

{% block breadcrumbs %}
  {{ block.super }}
  <li class="breadcrumb-item">
     <a href="{% url 'virtualization:virtualmachine_disks' pk=object.virtual_machine.pk %}">{{ object.virtual_machine }}</a>
  </li>
{% endblock %}