Re: [Xen-devel] Xen 4.2.1 boot failure with IOMMU enabled

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

----- povder@xxxxxxxxx wrote:

> I disabled id BIOS IDE interface that was causing problems and system
> boots fine. Thanks for your help!
> 
> I just wonder if it's a bug in BIOS or in Xen. If it's ASUS bug I
> would like to report bug to them.


This looks like BIOS bug -- there is no entry for the IDE interface in IVRS
table (which is used by IOMMU driver to discover devices). 

I am wondering whether such cases (undeclared devices in IVRS) should cause a
panic or disabling of IOMMU. This may be a more generic case of Jan's earlier 
patch for dealing with missing IOAPIC. Not sure whether it would be possible 
to "unwind" IOMMU at this point though.

(For the record, I asked povder to run with xen-unstable that I provided 
to him because for some reason I thought this might be combined mode problem.
Obviously this had nothing to do with combined mode)

-boris

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