RE: [Xen-devel] iommu: mapping reserved region failed - Q35 -VT-DIssue

["Ross Philipson" <Ross.Philipson@xxxxxxxxxx>]

OK, that is what I was going to give you anyway and that is sort of what
I expected. Can you get a dump of you ACPI DMAR table. You can use
pmtools to dump the ACPI tables:

http://kernel.org/pub/linux/kernel/people/lenb/acpi/utils/

You will have to build it and then run the dump tool. If you use the all
option it will dump everything. I then have a little tool that prints
out the DMAR in human readable form so we can see what the DRHD
reporting structures look like. 

Thanks
Ross

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Stefan Bauer
Sent: Friday, October 31, 2008 10:32 AM
Cc: 'xen-devel@xxxxxxxxxxxxxxxxxxx'
Subject: Re: [Xen-devel] iommu: mapping reserved region failed - Q35
-VT-DIssue

Han, Weidong schrieb:
>      if ( !drhd )
> +    {
> +        printk("%s: can't find drhd for device (bus=%x dev=%x
func=%x)\n",
> +                __func__, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
>          return -ENODEV;
> +    }
> 
> and you also can change XENLOG_INFO to XENLOG_ERR in
domain_context_mapping(). 

Added and recompiled, output here:

www.plzk.de/CAPTURE2

> A few months ago,  in xen mailing list I remember some guys reported:
when using PEG card (turning off integrated Gfx) on Q35, VT-d cannot
work. It's the bios issue. I suspect it's not fixed yet. So I suggest
you to use IGD instead of PEG.

I would, but if i do not select PEG in bios, lspci did not show the
PEG card.

Stefan

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