On Fri, Nov 06, 2015 at 08:10:45PM +0800, Baoquan He wrote:
> They will be called later when copy old dev/irq tables. It's better to use
> them
> then call iommu_flush_all_caches() since iommu_flush_all_caches() will
> iterate many empty table entries.
You only flush all table entries on old AMD IOMMUs. Newer ones have a
flush_all command that is used when available. Besides that, the AMD
IOMMU hardware is usually fast so that even flushing all dte entries is
not a bottleneck (it is done during suspend/resume, for example).
Have you made different experiences?
Joerg
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