linux-kernel - Re: [PATCH RFC] fixup! virtio: convert to use DMA api

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Date:	Tue, 19 Apr 2016 19:04:43 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Cornelia Huck <cornelia.huck@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"qemu-devel@...gnu.org Developers" <qemu-devel@...gnu.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Wei Liu <wei.liu2@...rix.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	peterx@...hat.com, Stefan Hajnoczi <stefanha@...hat.com>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	qemu-block@...gnu.org, Kevin Wolf <kwolf@...hat.com>,
	Amit Shah <amit.shah@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jason Wang <jasowang@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	kvm list <kvm@...r.kernel.org>
Subject: Re: [PATCH RFC] fixup! virtio: convert to use DMA api

On Tue, Apr 19, 2016 at 09:00:27AM -0700, Andy Lutomirski wrote:
> On Apr 19, 2016 2:13 AM, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> >
> >
> > I guess you are right in that we should split this part out.
> > What I wanted is really the combination
> > PASSTHROUGH && !PLATFORM so that we can say "ok we don't
> > need to guess, this device actually bypasses the IOMMU".
> 
> What happens when you use a device like this on Xen or with a similar
> software translation layer?

I think you don't use it on Xen since virtio doesn't bypass an IOMMU there.
If you do you have misconfigured your device.

-- 
MST