Re: [Xen-devel] Re: follow-up to guest debug support patches

[Jack F Vogel <jfv@xxxxxxxxxxxx>]

On Sat, Mar 12, 2005 at 10:40:02AM -0800, Kip Macy wrote:
   
> > Doesn't the change in traps.c break in-guest debugger support?  It seems
> > to always pause the domain if it is in kernel, an in-guest debugger
> > which has set a breakpoint in the kernel will never get the int3.  I
> > think
> > this needs some kind of flag to enable/disable this behaviour.
> 
> I thought about that, but is there an In-guest kernel debugger that
> can set breakpoints? All I know of are stubs that require a serial
> port. Does NetBSD's in-kernel debugger allow one to set breakpoints
> and continue? If so I can just put the debugger option back in
> Rules.mk.
  
I believe there is a kdb patch for i386 Linux, and I have intended
to extend my x86_64 kdb patch to Xen soon.

I had even had thoughts of an extended debugger in dom0, but have
been too busy to think that through. Any thoughts from others on
that? I recall a particularly nasty AIX bug that I worked on once
on an S390 machine, the debugger in the nucleus (on VM/ESA) allowed
me to set a watchpoint outside the guest and made a memory corruption
problem MUCH easier to track down :)

Cheers,

Jack



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