Xendbg: A Full-Featured Debugger for the Xen Hypervisor

https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/2019/january/xendbg-a-full-featured-debugger-for-the-xen-hypervisor/

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xendbg is a feature-complete reference implementation of a modern Xen VMI debugger, superseding Xen's own limited and rarely-maintained gdbsx. It can debug both paravirtualized (PV) and hardware virtualized (HVM) guests, and provides both a standalone REPL and an LLDB server mode.

https://github.com/nccgroup/xendbg