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Re: [PATCH v9 6/8] common/grant_table: batch flush I/O TLB



Hi Paul,

On 15/09/2020 09:29, Paul Durrant wrote:
From: Paul Durrant <pdurrant@xxxxxxxxxx>

This patch avoids calling iommu_iotlb_flush() for each individual GNTTABOP and
instead calls iommu_iotlb_flush_all() at the end of a batch. This should mean
non-singleton map/unmap operations perform better.

NOTE: A batch is the number of operations done before a pre-emption check and,
       in the case of unmap, a TLB flush.

Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

Cheers,

--
Julien Grall



 


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