Re: [Xen-devel] iommu hangs boot

[Simon Horman <horms@xxxxxxxxxxxx>]

On Wed, Feb 18, 2009 at 12:00:34PM -0500, Alexia Benington wrote:
> Hi all,
> 
> There was a similar thread I started earlier, however as the title
> didn't correctly reflect the symptoms. I created this after more
> experiments.
> 
> Here's some background. I was able to get graphics passthrough to work
> on Fedora 10 with Intel DQ45CB and an ATI gfx card inserted. I passed
> through the integrated Intel gfx instead of ATI. BIOS was set to use
> Intel gfx.
> 
> However, when I took out the ATI gfx, the iommu option seems to cause
> the boot up to hang, as shown in "090218.1.log". Without iommu=1,
> bootup seems normal. But of course passthrough won't work.
> Interestingly, when I closed minicom and start it again, I have the
> output as shown in "090218.2.log". It doesn't matter whether I'm
> hiding any PCI devices from Dom0. Setting iommu=1 is sufficient to
> cause the hang. Why is so?
> 
> Does anyone have any idea why the presence of ATI gfx seems to make
> things work, and removing it causes the hanging?

This smells a lot like fall-out from 19175 to me.
Unfortunately I don't have any ideas of fixes at this time.

-- 
Simon Horman
  VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
  H: www.vergenet.net/~horms/             W: www.valinux.co.jp/en


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