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xen-devel
Re: [Xen-devel] XenDebugger-HOWTO
nsplitd allows you to use one serial port for both the debugger and the
console. It multiplexes the two by setting the high-bit on one and not
the other.
Sample - machine is named 'larry'
from /etc/services:
shemp0 6056/tcp # shemp console
shempnsplit 12016/tcp # shemp nsplit service
6056 is the port on the actual console server - 12016 is the port I
connect to on this machine to connect to the console
from /etc/xinetd.d/nsplit:
service shempnsplit
{
socket_type = stream
protocol = tcp
wait = no
user = root
server = /usr/sbin/in.nsplitd
server_args = raidqa-cpt1:shemp0
disable = no
}
raidqa-cpt1 is the name of the console server -
I connect to shemp's console by on larry 12016, I connect gdb with
(gdb) target remote shemp:2345
Just to warn you. I've found PDB to be completely broken for the past
four months. If you get it to work, let me know what your setup is. If
you are debugging DOM0 or xen, it is pretty much your only option. If
you are debugging a guest, my debug patches work *much* better.
-Kip
On Mon, 17 Jan 2005, Ryan Harper wrote:
> I've been trying to get the XenDebugger running on the unstable tree.
> After compiling xen with debugging=y ( and some patches ), I started
> following the XenDebugger-Howto, but something is missing.
>
> How does nsplitd connect to the serial line going into Xen?
>
> Looking at the diagram entitled Setup:
>
> Setup
> -----
>
> +-------+ telnet +-----------+ serial +-------+
> | GDB |--------| nsplitd |--------| Xen |
> +-------+ +-----------+ +-------+
>
> it would seem that nsplitd connects a gdb-telnet session to the serial
> connection into Xen running with pdb on. However, if you examine
> nsplitd code there is nothing related to serial at all, just sockets.
>
> Looking further into the howto, I set up my xinetd conf as instructed
> and added the two lines to /etc/services:
>
> hostname$ egrep 'wcons00|nsplit1' /etc/services
> wcons00 9600/tcp # Wanda remote console
> nsplit1 12010/tcp # Nemesis console splitter ports.
>
> What is the Wanda remote console?
>
> I'm guessing that Wanda is the missing piece that connects the local
> serial port to the network. If so, where is Wanda? And if not, what am
> I missing that connects the network connection (gdb telnet) to the
> serial line into xen?
>
> Ryan Harper
>
>
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