[Xen-devel] split mapping in clear_kernel_mapping()

["Langsdorf, Mark" <mark.langsdorf@xxxxxxx>]

I am working to get Opteron IOMMU support for Xen.

I have progressed to the point where the system
boots, finds and sizes the aperture, and mostly
seems to work.  However, my NIC is not working
(it works with the same kernel without IOMMU
support) and I see the following message in
the kernel log after the IOMMU is set up:

clear_kernel_mapping: mapping has been split. will leak memory
arch/xen/x86_64/mm/init.c:724 bad pmd <address>(<reg>).

Line 724 of init.c has a comment saying 
"could handle this, but it should not happen currently.*/

How should I be handling the split mapping?

internal dmesg log attached.

-Mark Langsdorf
AMD, Inc.

Attachment: 5g-iommu-split.log.gz
Description: 5g-iommu-split.log.gz

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