I finally figured out how to debug Windows XP running in one QEMU instance with WinDbg running in another:

Edit boot.ini in the debuggee to add an entry to start Windows XP with "/debugport=com1 /baudrate=115200" arguments.

Start the debuggee VM with "qemu -net nic -net tap -serial tcp:127.0.0.1:4444,server". QEMU will now wait for a connection on 127.0.0.1:4444.

Start the debugger VM with "qemu -net nic -net tap -serial tcp:127.0.0.1:4444". This will connect to the debuggee VM and both VMs will now start booting. Make sure to interrupt the debuggee VM's boot menu countdown at this point.

When the debugger VM has fully booted, start WinDbg in that VM and click "File->Kernel Debug", select "COM", set "Baud Rate" to "115200", "Port" to "com1" and click "Ok".

In the debuggee VM, select the boot menu entry that will start Windows with remote debugging enabled now.

WinDbg should recognize the debuggee VM now. Have fun.

Kasperle on Feb 10, 2007, 21:51
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