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

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Message-ID: <1447988199.3016.2.camel@kernel.crashing.org>
Date:	Fri, 20 Nov 2015 13:56:39 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Woodhouse <dwmw2@...radead.org>,
	Andy Lutomirski <luto@...capital.net>,
	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Joerg Roedel <jroedel@...e.de>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	Christoph Hellwig <hch@....de>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff

On Thu, 2015-11-19 at 23:38 +0000, David Woodhouse wrote:
> 
> I understand that POWER and other platforms don't currently have a
> clean way to indicate that certain device don't have translation. And I
> understand that we may end up with a *quirk* which ensures that the DMA
> API does the right thing (i.e. nothing) in certain cases.
> 
> But we should *NOT* be involving the virtio device drivers in that
> quirk, in any way. And putting a feature bit in the virtio device
> itself doesn't seem at all sane either.
> 
> Bear in mind that qemu-system-x86_64 currently has the *same* problem
> with assigned physical devices. It's claiming they're translated, and
> they're not.

It's not that clear but yeah ... as I mentioned, I can't find a
way to do that quirk that won't break when we want to actually use
the iommu... 

Ben.

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