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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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