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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Mar 23, 2010 at 07:54:33PM +0000, Keir Fraser wrote:
> On 23/03/2010 19:37, "Pasi Kärkkäinen" <pasik@xxxxxx> wrote:
> 
> >> It's not impossible that the BIOS VT-d support is just broken (I assume
> >> you've never tested VT-d on this particular type of system before).
> > 
> > Yeah, I've never used VT-d on this system earlier, so it could just be 
> > broken
> > BIOS.
> > I guess Xen still shouldn't hang on it?
> 
> We'd prefer to gracefully disable VT-d.
> 

4.0.0-rc7 (without any extra cmdline options) does disable vt-d and boot ok, 
after 'hanging' for 30 seconds while parsing the DMAR tables.

If I add "iommu=verbose" option for Xen, then it'll print huge amount of stuff 
like I pasted earlier.. and it takes forever to print all that.

Hmm.. wondering if the patch Jan just sent will help with that. 
Sounds like it might help :)

-- Pasi


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