[Xen-devel] [Problem] about debuging xen

[éç <aware.why@xxxxxxxxx>]

The xen version of my host is xen-4.1.2, as the xen-4.1.2/docs/src/user.tex says:

\section{Xen Build Options}

 

Xen provides a number of build-time options which should be set as

environment variables or passed on make's command-line.

 

\begin{description}

\item[verbose=y] Enable debugging messages when Xen detects an

  unexpected condition.  Also enables console output from all domains.

\item[debug=y] Enable debug assertions.  Implies {\bf verbose=y}.

  (Primarily useful for tracing bugs in Xen).

\item[debugger=y] Enable the in-Xen debugger. This can be used to

  debug Xen, guest OSes, and applications.

\item[perfc=y] Enable performance counters for significant events

  within Xen. The counts can be reset or displayed on Xen's console

  via console control keys.

\end{description}

I build with ``make xen debugger=y`` and copy the dist/install/boot/xen-4.1.2.gz to /boot of xen host.

There is another linux host which connects to the xen host through serial cable.

Reboot xen host,  in the linux host, I see the xen boot information and can send key-command to xen as well as CTRL+A used to switch input, but I have no idea how to make the xen hypervisor continues to run and how to trap into kdb. 

I tried the CTRL+\ , but failed to trap info kdb.

Appriciate your reply, thanks in advance.

(XEN) 'h' pressed -> showing installed handlers

(XEN)  key '%' (ascii '25') => trap to xendbg

(XEN)  key '*' (ascii '2a') => print all diagnostics

(XEN)  key '0' (ascii '30') => dump Dom0 registers

(XEN)  key 'A' (ascii '41') => toggle alternative key handling

(XEN)  key 'C' (ascii '43') => trigger a crashdump

(XEN)  key 'H' (ascii '48') => dump heap info

(XEN)  key 'M' (ascii '4d') => dump MSI state

(XEN)  key 'N' (ascii '4e') => trigger an NMI

(XEN)  key 'Q' (ascii '51') => dump PCI devices

(XEN)  key 'R' (ascii '52') => reboot machine

(XEN)  key 'a' (ascii '61') => dump timer queues

(XEN)  key 'c' (ascii '63') => dump ACPI Cx structures

(XEN)  key 'd' (ascii '64') => dump registers

(XEN)  key 'e' (ascii '65') => dump evtchn info

(XEN)  key 'g' (ascii '67') => print grant table usage

(XEN)  key 'h' (ascii '68') => show this message

(XEN)  key 'i' (ascii '69') => dump interrupt bindings

(XEN)  key 'm' (ascii '6d') => memory info

(XEN)  key 'n' (ascii '6e') => NMI statistics

(XEN)  key 'q' (ascii '71') => dump domain (and guest debug) info

(XEN)  key 'r' (ascii '72') => dump run queues

(XEN)  key 's' (ascii '73') => dump softtsc stats

(XEN)  key 't' (ascii '74') => display multi-cpu clock info

(XEN)  key 'u' (ascii '75') => dump numa info

(XEN)  key 'z' (ascii '7a') => print ioapic info

(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)

(XEN) *** Serial input -> Xen (type 'CTRL-a' three times to switch input to DOM0)

(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)

(XEN) *** Serial input -> Xen (type 'CTRL-a' three times to switch input to DOM0)

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