Re: [Xen-devel] Fwd: RMRR is incorrect (was: VT-d does not work any more after BIOS update on DQ35MP)

[Neo Jia <neojia@xxxxxxxxx>]

FYI. I saw the same issue on x38 & x48 chipset.

Wondering if we can manually modify the DMAR table.

Thanks,
Neo

---------
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!

On Nov 25, 2008, at 2:45 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>  
wrote:
> On 25/11/08 10:10, "Ralf Hornik Mailings" <ralf@xxxxxxxxxxxxxxxxx>  
> wrote:
> > Now, after recompiling xen version 3.3 (make dist) I get the  
> > following
> > error in "xm dmesg":
> >
> > ...
> > (XEN) Xen heap: 14MB (14720kB)
> > (XEN) Domain heap initialised
> > (XEN) Processor #0 6:15 APIC version 20
> > (XEN) Processor #2 6:15 APIC version 20
> > (XEN) Processor #1 6:15 APIC version 20
> > (XEN) Processor #3 6:15 APIC version 20
> > (XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
> > (XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
> > (XEN) [VT-D]dmar.c:354: RMRR is incorrect.
> > (XEN) Failed to parse ACPI DMAR.  Disabling VT-d.
> > (XEN) Using scheduler: SMP Credit Scheduler (credit)
> > (XEN) Detected 2388.018 MHz processor.
> > ...
> >
> > So wthat does this error mean?
> Xen failed to parse one of your BIOS's information tables. However,  
> the
> table relates to Intel's VT-d feature which you are almost certainly  
> not
> using.
>
> -- Keir
>
>
>
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