Subject: Re: [PATCH kernel v2 2/4] KVM: PPC: Invalidate multiple TCEs at once

From: Paul Mackerras <[email-masked]>
Date: Tue, 27 Aug 2019 10:32:20 +1000

On Mon, Aug 26, 2019 at 04:17:03PM +1000, Alexey Kardashevskiy wrote:
> Invalidating a TCE cache entry for each updated TCE is quite expensive.
> This makes use of the new iommu_table_ops::xchg_no_kill()/tce_kill()
> callbacks to bring down the time spent in mapping a huge guest DMA window;
> roughly 20s to 10s for each guest's 100GB of DMA space.
> 
> Signed-off-by: Alexey Kardashevskiy <[email-masked]>

With the addition of "Book3S" to the patch title,

Acked-by: Paul Mackerras <[email-masked]>