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    SubjectRe: [PATCH v11 00/17] Provide a zero-copy method on KVM virtio-net.
    On Sat, Sep 25, 2010 at 12:27:18PM +0800, xiaohui.xin@intel.com wrote:
    > We provide an zero-copy method which driver side may get external
    > buffers to DMA. Here external means driver don't use kernel space
    > to allocate skb buffers. Currently the external buffer can be from
    > guest virtio-net driver.
    >
    > The idea is simple, just to pin the guest VM user space and then
    > let host NIC driver has the chance to directly DMA to it.
    > The patches are based on vhost-net backend driver. We add a device
    > which provides proto_ops as sendmsg/recvmsg to vhost-net to
    > send/recv directly to/from the NIC driver. KVM guest who use the
    > vhost-net backend may bind any ethX interface in the host side to
    > get copyless data transfer thru guest virtio-net frontend.
    > patch 01-10: net core and kernel changes.
    > patch 11-13: new device as interface to mantpulate external buffers.
    > patch 14: for vhost-net.
    > patch 15: An example on modifying NIC driver to using napi_gro_frags().
    > patch 16: An example how to get guest buffers based on driver
    > who using napi_gro_frags().
    > patch 17: It's a patch to address comments from Michael S. Thirkin
    > to add 2 new ioctls in mp device.
    > We split it out here to make easier reiewer.



    I commented on how to avoid mm semaphore on data path separately, and
    since you didn't have time to review that yet, I won't repeat that here.

    At this point what are the plans on macvtap integration?
    You indicated this is the interface you intend to use longterm.



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