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Date: Wed, 28 Oct 2015 09:17:02 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: Andy Lutomirski <luto@...nel.org> Cc: linux-kernel@...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>, benh@...nel.crashing.org, KVM <kvm@...r.kernel.org>, dwmw2@...radead.org, Martin Schwidefsky <schwidefsky@...ibm.com>, linux-s390 <linux-s390@...r.kernel.org>, virtualization@...ts.linux-foundation.org Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff On Tue, Oct 27, 2015 at 11:38:57PM -0700, Andy Lutomirski wrote: > This switches virtio to use the DMA API unconditionally. I'm sure > it breaks things, but it seems to work on x86 using virtio-pci, with > and without Xen, and using both the modern 1.0 variant and the > legacy variant. I'm very glad to see work on this making progress. I suspect we'll have to find a way to make this optional though, and keep doing the non-DMA API thing with old devices. And I've been debating with myself whether a pci specific thing or a feature bit is preferable. Thoughts? > Changes from v2: > - Fix really embarrassing bug. This version actually works. > > Changes from v1: > - Fix an endian conversion error causing a BUG to hit. > - Fix a DMA ordering issue (swiotlb=force works now). > - Minor cleanups. > > Andy Lutomirski (3): > virtio_net: Stop doing DMA from the stack > virtio_ring: Support DMA APIs > virtio_pci: Use the DMA API > > drivers/net/virtio_net.c | 53 +++++++---- > drivers/virtio/Kconfig | 2 +- > drivers/virtio/virtio_pci_common.h | 3 +- > drivers/virtio/virtio_pci_legacy.c | 19 +++- > drivers/virtio/virtio_pci_modern.c | 34 +++++-- > drivers/virtio/virtio_ring.c | 187 ++++++++++++++++++++++++++++++------- > tools/virtio/linux/dma-mapping.h | 17 ++++ > 7 files changed, 246 insertions(+), 69 deletions(-) > create mode 100644 tools/virtio/linux/dma-mapping.h > > -- > 2.4.3 -- 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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