linux-kernel - Re: [RFC v2 2/4] iommu/arm-smmu-v3: Add tlbi_on

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Message-ID: <703a5dec-d1e6-f9cb-eab2-e4fcf8d20665@redhat.com>
Date:   Fri, 18 Aug 2017 08:50:18 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Will Deacon <will.deacon@....com>, eric.auger.pro@...il.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        robin.murphy@....com, Jean-Philippe.Brucker@....com,
        christoffer.dall@...aro.org, Marc.Zyngier@....com,
        alex.williamson@...hat.com, peterx@...hat.com, tn@...ihalf.com,
        bharat.bhushan@....com
Subject: Re: [RFC v2 2/4] iommu/arm-smmu-v3: Add tlbi_on_map option

Hi Michael,
On 18/08/2017 04:54, Michael S. Tsirkin wrote:
> On Thu, Aug 17, 2017 at 07:47:04PM +0200, Auger Eric wrote:
>> I will see with Peter and other potential users in the community whether
>> it is worth to pursue the efforts on upstreaming the QEMU vSMMUv3
>> device, considering the VFIO/VHOST integration is made impossible.
> 
> I posted more ideas on finding a way to support it after all separately.
> Even without this:
> 	1. VHOST does not need to be notified on map.
My mistake. I will split the QEMU series accordingly.
> 	2. VFIO might be possible for hardware that supports nested page tables.
> 
> IMHO 2 is worth looking into.
OK That's my next step.

Thank you for your suggestions.

Eric

>