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Date:   Tue, 27 Aug 2019 10:32:20 +1000
From:   Paul Mackerras <paulus@ozlabs.org>
To:     Alexey Kardashevskiy <aik@ozlabs.ru>
Cc:     linuxppc-dev@lists.ozlabs.org,
        David Gibson <david@gibson.dropbear.id.au>,
        kvm-ppc@vger.kernel.org, kvm@vger.kernel.org,
        Alistair Popple <alistair@popple.id.au>,
        Alex Williamson <alex.williamson@redhat.com>,
        Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH kernel v2 2/4] KVM: PPC: Invalidate multiple TCEs at once
Message-ID: <20190827003220.GA16075@blackberry>
References: <20190826061705.92048-1-aik@ozlabs.ru>
 <20190826061705.92048-3-aik@ozlabs.ru>
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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 <aik@ozlabs.ru>

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

Acked-by: Paul Mackerras <paulus@ozlabs.org>