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This document explains how to debug a guests' kernel using KGDB.
1. Run the guest:
'lkvm run -k [vmlinuz] -p "kgdboc=ttyS1 kgdbwait" --tty 1'
And see which PTY got assigned to ttyS1 (you'll see:
' Info: Assigned terminal 1 to pty /dev/pts/X').
2. Run GDB on the host:
'gdb [vmlinuz]'
3. Connect to the guest (from within GDB):
'target remote /dev/pty/X'
4. Start debugging! (enter 'continue' to continue boot).