Re: [Xen-devel] anybody using pdb?

[Christian Limpach <chris@xxxxxx>]

> I've fixed this a better way, by enabling interrupts before calling
> the pdb handler. Let me know if it still doesn't work.

No it doesn't work, at least not for the "jump to the debugger by pressing
D" case.  Maybe because you only enabled interrupts during traps but not
during interrupts?  AFAICT there's also some locking/flag setting which
might prevent further interrupts while the handler is still running (if I'm
looking at the right code, do_IRQ in xen/arch/i386/irq.c).

I considered enabling interrupts at first but I couldn't exclude re-entrance
issues.  Also I think that it's not the right thing to do in this case:  if
you're using the debugger on Xen, you don't want interrupts enabled.  I
think you'd actually want them explicitly disabled (as opposed to the
previous/current implicit disabling).

   christian



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