linux-kernel - Re: [PATCH v5 04/10] vring: Introduce vring_use_dma

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Message-ID: <1454343091.4788.0.camel@infradead.org>
Date:	Mon, 01 Feb 2016 16:11:31 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Andy Lutomirski <luto@...capital.net>,
	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Andy Lutomirski <luto@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	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>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH v5 04/10] vring: Introduce vring_use_dma_api()

On Mon, 2016-02-01 at 07:39 -0800, Andy Lutomirski wrote:
> 
> >> Could we have an arch_vring_eschew_dma_api(dev) function which the
> >> affected architectures could provide (as a prelude to fixing it so that
> >> the DMA API does the right thing for *itself*)?
> >
> > I'm fine with this.
> 
> I modified vring_use_dma_api to take a vring_virtqueue* parameter to
> make this easier.
> 
> I'm a bit torn here.  I want to get the mechanism and the Xen part in,
> and there's unlikely to be much debate on those as a matter of
> principle.  I'd also like to flip as many arches over as possible, but
> that could be trickier.  Let me mull over this.

Let's queue the arch_vring_eschew_dma_api() thing up after this first
batch, and not hold it up any further.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation


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