Got the Virtualization GDB stub working! (Thanks for spotting this in the binary, @jmpews.) 
Using it is pretty simple: first, trick com.apple.Virtualization.VirtualMachine into thinking you have the https://t.co/Cj7K2yvHAG.private.virtualization entitlement. You’ll need to attach early; I this again:
https://twitter.com/_saagarjha/status/1409677129382436864
Then just:
(lldb) b xpc_connection_copy_entitlement_value
(lldb) breakpoint command add
> thread return (id)xpc_bool_create(1)
> c
I think the XPC connection has a timeout, so make sure your breakpoint automatically continues execution.
(lldb) b xpc_connection_copy_entitlement_value
(lldb) breakpoint command add
> thread return (id)xpc_bool_create(1)
> c
I think the XPC connection has a timeout, so make sure your breakpoint automatically continues execution.
Finally, initialize a _VZGDBDebugStubConfiguration with a port and then set your VZVirtualMachineConfiguration’s _debugStub to it.
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