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

["Han, Weidong" <weidong.han@xxxxxxxxx>]

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@xxxxxxxxx>

Attachment: fix-iommu-domid.patch
Description: fix-iommu-domid.patch

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