Re: [Xen-devel] Anybody got a tool to peer into a guest domain?

[Randy Thelen <rthelen@xxxxxxxxxx>]

Keir Fraser wrote:

> The gdb debugger stub has been updated to work with HVM guests. See  
> some docs under tools/debugger/gdb.
After reading the README in that directory and following its  
directions, I'm still not successful at getting gdbserver to run.
Here is what I did:

$ ./gdbbuild
...
$ cp gdb-6.2.1-linux-i386-xen/gdb/gdbserver/gdbserver /usr/bin/

(email I've read since that operation indicate I should rename  
gdbserver to gdbserver-xen.  And the README states that the file will  
already be called gdbserver-xen, which it isn't.)
$ xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0     1677     2 r-----   721.9
Linux-hvm                         10      256     1 -b----    25.0
$ gdbserver 127.0.0.1:9999 --attach 10
Cannot attach to process 10: Operation not permitted (1)
$

Hmm.

$ whoami
root
$

Some documentation indicates that I need to compile the guest domain  
kernel with:
> Build your kernel with debug.  I use the flags
>   "verbose=y domu_debug=y debug=y".  although I dont know if these
>   are all required.

But, I'm trying to debug a HVM domain with a FreeBSD, which leaves me  
with what options?  And, I'm debugging an arbitrary piece of code in  
that domain ... btxldr?  ficl?  Don't know.  That's part of why I  
need to peer into the domain.
-- Randy

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