kdb for xen

kdb for xen

[Mukesh Rathor]

Hi xen folks,

   It is my pleasure to announce an internal debugger for the xen hypervisor 
(64bit). It's a full fledged debugger that will "halt" the system, so the 
entire state can be examined. Some examples of commands:

xkdb> cpu all    : see one line state of all cpus
xkdb> cpu 7      : switch to cpu 7 (the leaving cpu will pause immed)
xkdb> dd addr 32 : display 32 bytes at address in doublewords
xkdb> dr sp      : display registers including special registers
xkdb> ni         : single step (go over function calls)
xkdb> dom 5      : display dom 5 details
xkdb> vcpu <ptr> : display vcpu details at give "ptr"

Type "h" at the prompt for all commands and usages.

It can be downloaded from:

http://xenbits.xensource.com/ext/kdb.hg

and built by running "make kdb=y" in xen-unstable.hg/xen


FEATURES:
   - set breakpoints in hypervisor
   - examine/modify memory, registers, special registers, domains, vcpus, etc..
   - single step, single step till jump/call, step over call to next
     instruction after the call.
   - examine/modify memory of a PV guest.
   - set breakpoints, single step, etc... for a PV guest.
   - above functionality for HVM guest if the debugger breaks into a running
     HVM guest.
   - breaking into the debugger will freeze the system, all CPUs will pause,
     no interrupts are acknowledged in the debugger. (Hence, the wall clock
     will drift)
   - single step will step only that cpu.

Regards,
Mukesh Rathor

Re: kdb for xen

[Mukesh Rathor]

kdb for xen has moved to:

http://xenbits.xensource.com/ext/debuggers.hg

(from http://xenbits.xensource.com/ext/kdb.hg)

thanks,
mukesh

Re: kdb for xen

[Mukesh Rathor]

Hi folks,
   If you are using kdb,  I've updated kdb repo with couple bug fixes (hangs 
on SMP), and added "earlykdb" option to break into kdb early during boot. I've 
tested it out on a large box, and seems to be doing fine. I still can't get 
hvm_copy* functions to work, but Ben is also helping on that, and I will 
continue working on it too.....


Please refresh.

 > http://xenbits.xensource.com/ext/kdb.hg

Thanks
Mukesh