[Xen-devel] Backport per-device vector map patches to xen 4.1.3

[Wei Wang2 <wei.wang2@xxxxxxx>]

Recently we found an issue in xen 4.1. Under heavy I/O stress such as running 
bonnie++, Dom0 would lost its hard disk with lots of I/O errors. We found 
that some PCI-E devices was using the same vector as SMBus on AMD platforms 
and George' patch set that enables per-device vector map can fix this 
problem.

Following patches have been back ported and tested by Jacob and Wei H.  
Please apply them to Xen 4.1.3 

Thanks,
Wei

23752 xen: Infrastructure to allow irqs to share vector maps
23753 xen: Option to allow per-device vector maps for MSI IRQs
23754 xen: AMD IOMMU: Automatically enable per-device vector maps
23786 x86: Fix up irq vector map logic
23812 xen: Add global irq_vector_map option
23899 AMD-IOMMU: remove dead variable references

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