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[Bug 1463584] Re: Add support for VMBus panic notifier handler


Test case on Hyper-V:
  - Run: "echo c > /proc/sysrq-trigger"
  - If the Panic Notifier code is present, an event 18590 should be logged.

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  Add support for VMBus panic notifier handler

Status in linux package in Ubuntu:

Bug description:
  Please take these patches to our Hyper-V VMBus driver to enable kernel
  crash notification:

  Drivers: hv: vmbus: Add support for VMBus panic notifier handler

  Drivers: hv: vmbus: Correcting truncation error for constant HV_CRASH_CTL_CRASH_NOTIFY

  In the event of a kernel panic, VMBus driver supports sending five 64-bit values to be recorded in the log.  On Hyper-V this is recorded in the event log, and on Azure we can use this data to better detect failures like this in the guest VM and surface that as part of our diagnostics information.

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