linux-kernel - Re: [PATCH v3 0/3] virtio DMA API core stuff

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Message-ID: <20151028160531-mutt-send-email-mst@redhat.com>
Date:	Wed, 28 Oct 2015 16:07:48 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Andy Lutomirski <luto@...nel.org>,
	linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@....de>, KVM <kvm@...r.kernel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff

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
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