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    SubjectRe: [PATCH] Implement a virtio GPU transport
    On 10/10/10 16:11, Avi Kivity wrote:
    > On 10/06/2010 05:59 PM, Ian Molton wrote:
    >> This patch implements a virtio-based transport for use by a
    >> virtualised OpenGL passthrough implementation.
    >>
    >> The libGL and qemu-gl code to support this patch are available here:
    >>
    >> http://gitorious.org/vm-gl-accel/qemu-gl
    >> http://gitorious.org/vm-gl-accel/qemu-libgl
    >>
    >>
    >> Comments please!
    >
    > 1. copy qemu-devel

    Ok, will do.

    > an virtualization@, many virtio developers live there.

    you mean virtualization@lists.osdl.org ?

    > 2. should start with a patch to the virtio-pci spec to document what
    > you're doing

    Where can I find that spec?

    >> + /* Transfer data */
    >> + if (virtqueue_add_buf(vq, sg_list, o_page, i_page, (void *)1)>= 0) {
    >> + virtqueue_kick(vq);
    >> + /* Chill out until it's done with the buffer. */
    >> + while (!virtqueue_get_buf(vq,&count))
    >> + cpu_relax();
    >> + }
    >> +
    >
    > This is pretty gross, and will burn lots of cpu if the hypervisor
    > processes the queue asynchronously.

    It doesnt, at present... It could be changed fairly easily ithout
    breaking anything if that happens though.

    -Ian




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