From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff
Date: Wed, 28 Oct 2015 16:07:48 +0200
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To: David Woodhouse <dwmw2@infradead.org>
Cc: linux-s390 <linux-s390@vger.kernel.org>, Joerg Roedel <jroedel@suse.de>, KVM <kvm@vger.kernel.org>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Sebastian Ott <sebott@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Christian Borntraeger <borntraeger@de.ibm.com>, Andy Lutomirski <luto@kernel.org>, Paolo Bonzini <pbonzini@redhat.com>, Christoph Hellwig <hch@lst.de>, Martin Schwidefsky <schwidefsky@de.ibm.com>
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On Wed, Oct 28, 2015 at 10:37:56PM +0900, David Woodhouse wrote:
> On Wed, 2015-10-28 at 13:23 +0200, Michael S. Tsirkin wrote:
> > On Wed, Oct 28, 2015 at 05:36:53PM +0900, Benjamin Herrenschmidt
> > wrote:
> > > On Wed, 2015-10-28 at 16:40 +0900, Christian Borntraeger wrote:
> > > > We have discussed that at kernel summit. I will try to implement
> > > > a dummy dma_ops for
> > > > s390 that does 1:1 mapping and Ben will look into doing some
> > > > quirk to handle "old"
> > > > code in addition to also make it possible to mark devices as
> > > > iommu bypass (IIRC,
> > > > via device tree, Ben?)
> > > 
> > > Something like that yes. I'll look into it when I'm back home.
> > > 
> > > Cheers,
> > > Ben.
> > 
> > OK so I guess that means we should prefer a transport-specific
> > interface in virtio-pci then.
> 
> Why?

Because you said you are doing something device tree specific for ARM,
aren't you?

-- 
MST