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[Xen-devel] [PATCH 0/4] VT-d/qinval: miscellaneous adjustments

1: make local variable used for communication with IOMMU "volatile"
2: drop redundant calls to invalidate_sync()
3: clean up error handling
4: queue index is always unsigned

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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