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Hypervisor debugging problem

vls1729vls1729 Member Posts: 1

Hello,

I am attempting to setup a hypervisor debugging lab and having an issue with setting up the debugging connection.

My setup includes my host machine running windows 11 and a guest machine running windows 10/server 2019.
The debugger I am using is Windbg.

I have attempted to configure the setup with both VMware workstation and Hyper-V using the following:

  1. For COM serial connection:

    bcdedit /hypervisorsettings serial DEBUGPORT:1 BAUDRATE:115200
    bcdedit /set hypervisordebug on

    bcdedit /set dbgtransport kdhvcom.dll

    bcdedit /dbgsettings serial DEBUGPORT:1 BAUDRATE:115200
    bcdedit /debug on

  2. For network debugging:

    bcdedit /set hypervisordebug on
    bcdedit /hypervisorsettings NET HOSTIP:192.168.2.1 PORT:50000

    Bcdedit /debug yes
    Bcdedit /dbgsettings net hostip:192.168.2.1 port:50002

In both cases, kernel debugging works but the debugging session with the hypervisor does not work. There is no error or response.
Windbg simply waits for connection:

Microsoft (R) Windows Debugger Version 10.0.25877.1004 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.

Using NET for debugging
Opened WinSock 2.0
Using IPv4 only.
Waiting to reconnect...

I have disabled the firewalls but don't assume it to be the cause since the kernel debugging does goes through.
Secure boot is turned off at least in the VM/Hyper-V settings.

I will be grateful if someone who came across a similar issue can point me in the right direction or point me to some troubleshooting direction

Thanks a lot

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