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Date: Wed, 11 Nov 2015 11:44:42 +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 15:44 -0800, Andy Lutomirski wrote: > > > What about partition <-> partition virtio such as what we could do on > > PAPR systems. That would have the weak barrier bit. > > > > Is it partition <-> partition, bypassing IOMMU? No. > I think I'd settle for just something that doesn't regress > non-experimental setups that actually work today and that allow new > setups (x86 with fixed QEMU and maybe something more complicated on > powerpc and/or sparc) to work in all cases. > > We could certainly just make powerpc and sparc continue bypassing the > IOMMU until someone comes up with a way to fix it. I'll send out some > patches that do that, and maybe that'll help this make progress. But we haven't found a solution that works. All we have come up with is a quirk that will force bypass on virtio always and will not allow us to operate non-bypassing devices on either of those architectures in the future. I'm not too happy about this. 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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