On 13/8/08 12:48, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote:
> When I launch memtest as HVM guest, then Xen sends tons of VIRQ_MCA events
> to the Dom0, although there occured NO correctable machine check errors.
> When the Dom0 tries to fetch the error telemetry, then the
>
> BUG_ON(mc_data.fetch_idx > mc_data.error_idx); in x86_mcinfo_getfetchptr()
> in xen/arch/x86/cpu/mcheck/mce.c is hit. (x86_mcinfo_getfetchptr() only works
> if actually real error occured which is not the case.)
Perhaps you should be more wary of hypercall inputs? Failing the hypercall,
perhaps with a warning printk, would be better than BUG_ON() I think.
> This looks to me, there's a non-public event channel using the same number
> as VIRQ_MCA which fires when launching memtest as HVM guest.
I don't think this is the case. Sounds easy to repro this issue though. I'll
give it a go.
 -- Keir
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