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    SubjectRe: [RFC][PATCH v2 0/3] Provide a zero-copy method on KVM virtio-net.
    On 04/03/2010 02:51 AM, Sridhar Samudrala wrote:
    > On Fri, 2010-04-02 at 15:25 +0800, xiaohui.xin@intel.com wrote:
    >
    >> 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.
    >>
    > What is the advantage of this approach compared to PCI-passthrough
    > of the host NIC to the guest?
    >

    swapping/ksm/etc
    independence from host hardware
    live migration

    > Does this require pinning of the entire guest memory? Or only the
    > send/receive buffers?
    >

    If done correctly, just the send/receive buffers.

    --
    Do not meddle in the internals of kernels, for they are subtle and quick to panic.



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