From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= <pasik@iki.fi>
Subject: Re: Xen 4.0.0-rc7 problem/hang with vt-d DMAR parsing
Date: Fri, 26 Mar 2010 21:20:22 +0200
Message-ID: <20100326192022.GN1878@reaktio.net>
References: <20100325093445.GZ1878@reaktio.net>
	<C7D0E0F9.E6E6%keir.fraser@eu.citrix.com>
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To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Weidong Han <weidong.han@intel.com>, Jan Beulich <JBeulich@novell.com>, Dexuan Cui <dexuan.cui@intel.com>
List-Id: xen-devel@lists.xenproject.org

On Thu, Mar 25, 2010 at 09:44:25AM +0000, Keir Fraser wrote:
> On 25/03/2010 09:34, "Pasi K=E4rkk=E4inen" <pasik@iki.fi> wrote:
>=20
> > On Thu, Mar 25, 2010 at 09:30:18AM +0000, Jan Beulich wrote:
> >>>>> Weidong Han <weidong.han@intel.com> 25.03.10 10:21 >>>
> >>> Sorry, I didn't copy it completely. Attached it. Thanks.
> >>=20
> >> Ah, yes, this one looks fine to me.
> >>=20
> >> Acked-by: Jan Beulich <jbeulich@novell.com>
> >>=20
> >=20
> > I'll test this patch tomorrow.
>=20
> I changed it around a bit and applied to xen-unstable, so you can just =
test
> tip.
>=20

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=3Dverbose:

(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