From: Allen Kay <allen.m.kay@intel.com>
Date: Fri, 14 Oct 2011 19:32:46 +0000 (-0700)
Subject: intel-iommu: fix superpage support in pfn_to_dma_pte()
X-Git-Tag: v3.1~1^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4399c8bf2b9093696fa8160d79712e7346989c46;p=pandora-kernel.git

intel-iommu: fix superpage support in pfn_to_dma_pte()

If target_level == 0, current code breaks out of the while-loop if
SUPERPAGE bit is set. We should also break out if PTE is not present.
If we don't do this, KVM calls to iommu_iova_to_phys() will cause
pfn_to_dma_pte() to create mapping for 4KiB pages.

Signed-off-by: Allen Kay <allen.m.kay@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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