Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpuarea

[Jeremy Fitzhardinge]

Eric W. Biederman wrote:
> Mike Travis <travis@xxxxxxx> writes:
>
>   
> > Unfortunately it's back to the problem of faulting before x86_64_start_kernel()
> > and grub just immediately reboots.  So I'm back at analyzing assembler and
> > config differences.
> >     
>
> Ok.  That is a narrow window of code.  So it shouldn't be too bad, nasty though.
>
> If you would like to trace through it I have attached my serial port
> debugging routines that I use in that part of the code.

Last time it was doing this, it was a result of a triple-fault caused by 
loading %ds with an all-zero gdt.  I modified Xen to dump the CPU state 
on triple-faults, so it was easy to pinpoint.  I can do that again if it 
helps.

   J
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