From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [RFC 0/4] Virtio uses DMA API for all devices
Date: Tue, 07 Aug 2018 10:18:07 +1000
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: robh@kernel.org, srikar@linux.vnet.ibm.com, mpe@ellerman.id.au, Will Deacon <will.deacon@arm.com>, linux-kernel@vger.kernel.org, linuxram@us.ibm.com, virtualization@lists.linux-foundation.org, Christoph Hellwig <hch@infradead.org>, jean-philippe.brucker@arm.com, paulus@samba.org, marc.zyngier@arm.com, joe@perches.com, robin.murphy@arm.com, david@gibson.dropbear.id.au, linuxppc-dev@lists.ozlabs.org, elfring@users.sourceforge.net, haren@linux.vnet.ibm.com, Anshuman Khandual <khandual@linux.vnet.ibm.com>
List-Id: virtualization@lists.linuxfoundation.org

On Tue, 2018-08-07 at 02:45 +0300, Michael S. Tsirkin wrote:
> > OK well, assuming Christoph can solve the direct case in a way that
> > also work for the virtio !iommu case, we still want some bit of logic
> > somewhere that will "switch" to swiotlb based ops if the DMA mask is
> > limited.
> > 
> > You mentioned an RFC for that ? Do you happen to have a link ?
> 
> No but Christoph did I think.

Ok I missed that, sorry, I'll dig it out. Thanks.

Cheers,
Ben.