How to capture a vmcore on a hung KVM guest via NMI

Issue

• How do I capture a vmcore from a hung KVM guest?
• How to send NMI signal to a KVMguest?

Prerequisites

• Kdump should be running and tested beforehand. Follow this article to configure and test the Kdump utility:
  How to troubleshoot kernel crashes, hangs, or reboots with kdump on Red Hat Enterprise Linux

• Alternatively, Kdump Helper may be considered for Kdump configuration.

• NMI panic tunables need to be enabled.