Xen devel - Dec 2009 - [PATCH] VT-d: fix iommu_domid for PCI/PCIx devices assignment

Currently, it clears iommu_domid and domid_map at the end of
domain_context_unmap_one() if no other devices under the same iommu owned by
this domain. But, when assign a PCI/PCIx device to a guest, it also assigns its
upstream bridge to the guest, and they use the same iommu_domid. In the
deassignment, the iommu_domid and domid_map are cleared in
domain_context_unmap_one() for the assigned PCI/PCIx device, therefore it cannot
get valid iommu_domid in followed domain_context_unmap_one for its upstream
bridge. It causes PCI/PCIx device re-assignment failure.

This patch moves the iommu_domid and domid_map clearing code to the end of
domain_context_unmap, where all dependent domain_context_unmap_one()s are
completed, thus fix above issue.

Signed-off-by: Weidong Han <Weidong.han@intel.com>


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