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Date:	Wed, 11 Nov 2015 11:44:42 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Joerg Roedel <jroedel@...e.de>, KVM <kvm@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	sparclinux@...r.kernel.org
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion

On Tue, 2015-11-10 at 15:44 -0800, Andy Lutomirski wrote:
> 
> > What about partition <-> partition virtio such as what we could do on
> > PAPR systems. That would have the weak barrier bit.
> >
> 
> Is it partition <-> partition, bypassing IOMMU?

No.

> I think I'd settle for just something that doesn't regress
> non-experimental setups that actually work today and that allow new
> setups (x86 with fixed QEMU and maybe something more complicated on
> powerpc and/or sparc) to work in all cases.
> 
> We could certainly just make powerpc and sparc continue bypassing the
> IOMMU until someone comes up with a way to fix it.  I'll send out some
> patches that do that, and maybe that'll help this make progress.

But we haven't found a solution that works. All we have come up with is
a quirk that will force bypass on virtio always and will not allow us
to operate non-bypassing devices on either of those architectures in
the future.

I'm not too happy about this.

Ben.

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