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

[Wei Liu <wl@xxxxxxx>]

On Tue, Sep 15, 2020 at 09:29:34AM +0100, 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>

Reviewed-by: Wei Liu <wl@xxxxxxx>