Re: [Xen-devel] Xen 4.0.0-rc7 problem/hang with vt-d DMAR parsing

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Mar 25, 2010 at 09:44:25AM +0000, Keir Fraser wrote:
> On 25/03/2010 09:34, "Pasi Kärkkäinen" <pasik@xxxxxx> wrote:
> 
> > On Thu, Mar 25, 2010 at 09:30:18AM +0000, Jan Beulich wrote:
> >>>>> Weidong Han <weidong.han@xxxxxxxxx> 25.03.10 10:21 >>>
> >>> Sorry, I didn't copy it completely. Attached it. Thanks.
> >> 
> >> Ah, yes, this one looks fine to me.
> >> 
> >> Acked-by: Jan Beulich <jbeulich@xxxxxxxxxx>
> >> 
> > 
> > I'll test this patch tomorrow.
> 
> I changed it around a bit and applied to xen-unstable, so you can just test
> tip.
> 

Ok, I just tested 4.0.0-rc8.

(XEN) ACPI: HPET id: 0xffffffff base: 0xfed00000
(XEN) [VT-D]dmar.c:371: Invalid ACPI DMAR entry length: 0x0
(XEN) Failed to parse ACPI DMAR.  Disabling VT-d.

No 30 second delay anymore, VT-d gets disabled immediately.

And with iommu=verbose:

(XEN) ACPI: HPET id: 0xffffffff base: 0xfed00000
(XEN) [VT-D]dmar.c:679: Host address width 36
(XEN) [VT-D]dmar.c:371: Invalid ACPI DMAR entry length: 0x0
(XEN) Failed to parse ACPI DMAR.  Disabling VT-d.

So both seem to work as expected with this broken BIOS.

Thanks!

-- Pasi


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