AMD IOMMU: implement lazy IO/TLB flushing

The IO/TLB flushing on every unmaping operation is the most expensive
part in AMD IOMMU code and not strictly necessary. It is sufficient to
do the flush before any entries are reused. This is patch implements
lazy IO/TLB flushing which does exactly this.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86/amd_iommu_types.h

@@ -196,6 +196,9 @@ struct dma_ops_domain {
 	 * just calculate its address in constant time.
 	 */
 	u64 **pte_pages;
+
+	/* This will be set to true when TLB needs to be flushed */
+	bool need_flush;
 };
 
 /*