Re: [Xen-ia64-devel] VT-i: general exception

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Mardi 11 Avril 2006 03:17, Xu, Anthony a écrit :
> From: Tristan Gingold
>
> >Sent: 2006?4?11? 0:03
> >To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: [Xen-ia64-devel] VT-i: general exception
> >
> >Hi,
> >
> >inside vmx_ivt.S:
> >
> >// 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
> >ENTRY(vmx_general_exception)
> >    VMX_DBG_FAULT(24)
> >    VMX_FAULT(24)
> >//    VMX_REFLECT(24)
> >END(vmx_general_exception)
> >
> >IIRC, VMX_FAULT is an infinite loop.  Therefore, in case of general
> > exception raised at the hots IVT, xen locks.
> >
> >Is it a bug or something not finished ?
>
> It's not a bug, normally general exception will not happen in guest,
> If it does happen, that means something wrong, it was used for
> debugging.
???

Try this program:

int main(void)
{
  int a = *(volatile int *)0xf000000000000000;
}

This locks up Xen!

Tristan.



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