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Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again

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On Mon, Feb 01, 2016 at 10:04:07AM -0800, Andy Lutomirski wrote:
> On Mon, Feb 1, 2016 at 3:00 AM, Wei Liu <wei.liu2@citrix.com> wrote:
> > Nice work, Andy.
> >
> > On Thu, Jan 28, 2016 at 06:31:13PM -0800, Andy Lutomirski wrote:
> >> This switches virtio to use the DMA API on Xen and if requested by
> >> module option.
> >>
> >> This fixes virtio on Xen, and it should break anything because it's
> >> off by default on everything except Xen PV on x86.
> >>
> >
> > What is your setup? My understanding is that virtio doesn't work on PV
> > guest as of now because a suitable transport is missing.
> 
> I cheated and ran Xen under KVM with the virtio-pci device provided by
> QEMU.   If you have virtme
> (https://git.kernel.org/cgit/utils/kernel/virtme/virtme.git/), you can
> do:
> 

Thanks for the clarification. This is exactly what I needed to know.  In
that case virtio-pci transport is used.  All virtio devices are exposed
as PCI devices.

Wei.


> virtme-run --kdir=. --pwd --xen xen-4.5.2 --qemu-opts -smp 3 -m 1024
> 
> where xen-4.5.2 is the gunzipped Xen binary.  (Other versions work, too.)
> 
> --Andy

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[PATCH v5 00/10] virtio DMA API, yet again Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  [PATCH v5 01/10] dma: Provide simple noop dma ops Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  [PATCH v5 07/10] virtio_mmio: Use the DMA API if enabled Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  [PATCH v5 08/10] virtio_pci: Use the DMA API if enabled Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  [PATCH v5 06/10] virtio: Add improved queue allocation API Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  [PATCH v5 04/10] vring: Introduce vring_use_dma_api() Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
    Re: [PATCH v5 04/10] vring: Introduce vring_use_dma_api() David Woodhouse <dwmw2@infradead.org> - 2016-02-01 12:30 +0100
      Re: [PATCH v5 04/10] vring: Introduce vring_use_dma_api() "Michael S. Tsirkin" <mst@redhat.com> - 2016-02-01 14:30 +0100
        Re: [PATCH v5 04/10] vring: Introduce vring_use_dma_api() Andy Lutomirski <luto@amacapital.net> - 2016-02-01 16:50 +0100
          Re: [PATCH v5 04/10] vring: Introduce vring_use_dma_api() David Woodhouse <dwmw2@infradead.org> - 2016-02-01 17:20 +0100
  [PATCH v5 03/10] s390/dma: Allow per device dma ops Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  [PATCH v5 02/10] alpha/dma: use common noop dma ops Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  [PATCH v5 05/10] virtio_ring: Support DMA APIs Andy Lutomirski <luto@kernel.org> - 2016-01-29 03:40 +0100
  Re: [PATCH v5 00/10] virtio DMA API, yet again David Woodhouse <dwmw2@infradead.org> - 2016-01-29 12:10 +0100
    Re: [PATCH v5 00/10] virtio DMA API, yet again Christoph Hellwig <hch@lst.de> - 2016-01-31 20:10 +0100
  Re: [PATCH v5 00/10] virtio DMA API, yet again "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-31 21:20 +0100
    Re: [PATCH v5 00/10] virtio DMA API, yet again Andy Lutomirski <luto@amacapital.net> - 2016-01-31 21:20 +0100
  Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again Wei Liu <wei.liu2@citrix.com> - 2016-02-01 12:10 +0100
    Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again Andy Lutomirski <luto@amacapital.net> - 2016-02-01 19:10 +0100
      Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again Wei Liu <wei.liu2@citrix.com> - 2016-02-01 22:30 +0100

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