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

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Message-ID: <20170818055031-mutt-send-email-mst@kernel.org>
Date:   Fri, 18 Aug 2017 05:54:26 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Auger Eric <eric.auger@...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

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.
	2. VFIO might be possible for hardware that supports nested page tables.

IMHO 2 is worth looking into.

-- 
MST