how to debug xen itself?

how to debug xen itself?

[Mohamad Rezaei]

hi,

I am trying to debug xen hypervisor through gdb, and its kgdb. I have
compiled xen with these options: --> make debug=y optimize=0
crash_debug=y CMDLINE="console=com1 gdb=com1 earlygdb=y" -j8

I was expecting xen to stop, and wait for my gdb connection through
serial port, but it boots up flawlessly. I am not sure what is my
problem. Should I do something other than that.

I am doing this because I want to use debugger to get better view of xen
internals.

-- 
Best Regards,
Mohamad Rezaei

Re: how to debug xen itself?

[Mohamad Rezaei]

On 12/25/2011 03:49 PM, Mohamad Rezaei wrote:
> hi,
> 
> I am trying to debug xen hypervisor through gdb, and its kgdb. I have
> compiled xen with these options: --> make debug=y optimize=0
> crash_debug=y CMDLINE="console=com1 gdb=com1 earlygdb=y" -j8
> 
> I was expecting xen to stop, and wait for my gdb connection through
> serial port, but it boots up flawlessly. I am not sure what is my
> problem. Should I do something other than that.
> 
> I am doing this because I want to use debugger to get better view of xen
> internals.
> 
Can someone just let me know if I am doing something wrong?

-- 
Best Regards,
Mohamad Rezaei

Re: how to debug xen itself?

[Tim Deegan]

At 12:14 +0330 on 27 Dec (1324988042), Mohamad Rezaei wrote:
> On 12/25/2011 03:49 PM, Mohamad Rezaei wrote:
> > hi,
> > 
> > I am trying to debug xen hypervisor through gdb, and its kgdb. I have
> > compiled xen with these options: --> make debug=y optimize=0
> > crash_debug=y CMDLINE="console=com1 gdb=com1 earlygdb=y" -j8
> > 
> > I was expecting xen to stop, and wait for my gdb connection through
> > serial port, but it boots up flawlessly. I am not sure what is my
> > problem. Should I do something other than that.
> > 
> > I am doing this because I want to use debugger to get better view of xen
> > internals.
> > 
> Can someone just let me know if I am doing something wrong?

You asked your question on Christmas Day - most people in Europe and the
USA are on holiday, so you shouldn't expect an answer to your question.

I don't use the gdb debugger so I can't help you; I don't think many
people do, so you may en up debugging the debugger yourself. 

Tim.

Re: how to debug xen itself?

[Pasi Kärkkäinen]

On Tue, Dec 27, 2011 at 11:00:32AM +0000, Tim Deegan wrote:
> At 12:14 +0330 on 27 Dec (1324988042), Mohamad Rezaei wrote:
> > On 12/25/2011 03:49 PM, Mohamad Rezaei wrote:
> > > hi,
> > > 
> > > I am trying to debug xen hypervisor through gdb, and its kgdb. I have
> > > compiled xen with these options: --> make debug=y optimize=0
> > > crash_debug=y CMDLINE="console=com1 gdb=com1 earlygdb=y" -j8
> > > 
> > > I was expecting xen to stop, and wait for my gdb connection through
> > > serial port, but it boots up flawlessly. I am not sure what is my
> > > problem. Should I do something other than that.
> > > 
> > > I am doing this because I want to use debugger to get better view of xen
> > > internals.
> > > 
> > Can someone just let me know if I am doing something wrong?
> 
> You asked your question on Christmas Day - most people in Europe and the
> USA are on holiday, so you shouldn't expect an answer to your question.
> 
> I don't use the gdb debugger so I can't help you; I don't think many
> people do, so you may en up debugging the debugger yourself. 
> 

Some google-hits:

"[Xen-devel] Debugging XEN Hypervisor":
http://old-list-archives.xen.org/archives/html/xen-devel/2009-10/msg00328.html

"[Xen-devel] Debugging XEN Hypervisor":
http://old-list-archives.xen.org/archives/html/xen-devel/2009-09/msg01064.html

"[Xen-devel] kdb does not support XEN?":
http://old-list-archives.xen.org/archives/html/xen-devel/2010-12/msg01519.html


Hopefully those help..

-- Pasi

Re: how to debug xen itself?

[Ian Campbell]

On Tue, 2011-12-27 at 11:50 +0000, Pasi Kärkkäinen wrote:
> On Tue, Dec 27, 2011 at 11:00:32AM +0000, Tim Deegan wrote:
> > At 12:14 +0330 on 27 Dec (1324988042), Mohamad Rezaei wrote:
> > > On 12/25/2011 03:49 PM, Mohamad Rezaei wrote:
> > > > hi,
> > > > 
> > > > I am trying to debug xen hypervisor through gdb, and its kgdb. I have
> > > > compiled xen with these options: --> make debug=y optimize=0
> > > > crash_debug=y CMDLINE="console=com1 gdb=com1 earlygdb=y" -j8
> > > > 
> > > > I was expecting xen to stop, and wait for my gdb connection through
> > > > serial port, but it boots up flawlessly. I am not sure what is my
> > > > problem. Should I do something other than that.
> > > > 
> > > > I am doing this because I want to use debugger to get better view of xen
> > > > internals.
> > > > 
> > > Can someone just let me know if I am doing something wrong?
> > 
> > You asked your question on Christmas Day - most people in Europe and the
> > USA are on holiday, so you shouldn't expect an answer to your question.
> > 
> > I don't use the gdb debugger so I can't help you; I don't think many
> > people do, so you may en up debugging the debugger yourself. 
> > 
> 
> Some google-hits:
> 
> "[Xen-devel] Debugging XEN Hypervisor":
> http://old-list-archives.xen.org/archives/html/xen-devel/2009-10/msg00328.html
> 
> "[Xen-devel] Debugging XEN Hypervisor":
> http://old-list-archives.xen.org/archives/html/xen-devel/2009-09/msg01064.html
> 
> "[Xen-devel] kdb does not support XEN?":
> http://old-list-archives.xen.org/archives/html/xen-devel/2010-12/msg01519.html
> 
> 
> Hopefully those help..

As might http://xenbits.xen.org/docs/unstable/misc/crashdb.txt.

Mohamad -- if you figure this out please consider updating the above
document by posting a patch against xen-unstable.hg
docs/misc/crashdb.txt or perhaps by creating a wiki page.

Ian.

> 
> -- Pasi
> 
> 
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