linux-kernel - Re: [PATCH v4 0/6] virtio core DMA API conversion

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Message-ID: <1447194427.31884.100.camel@kernel.crashing.org>
Date:	Wed, 11 Nov 2015 09:27:07 +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 10:54 -0800, Andy Lutomirski wrote:
> 
> Does that work on powerpc on existing kernels?
> 
> Anyway, here's another crazy idea: make the quirk assume that the
> IOMMU is bypasses if and only if the weak barriers bit is set on
> systems that are missing the new DT binding.

"New DT bindings" doesn't mean much ... how do we change DT bindings on
existing machines with a FW in flash ?

What about partition <-> partition virtio such as what we could do on
PAPR systems. That would have the weak barrier bit.

Ben.

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