I am trying to achieve only host->guest communication and so I've created a virtio driver for the guest kernel which calls virtio_add_buf_gfp with one inbuf and 0 outbufs.
Whenever I boot the system, lguest crashes complaining of a kernel BUG. At the line specified in virtio_ring.c, I see the following: BUG_ON(out + in > vq->vring.num); >From this, it seems to me that I need more vrings than buffers. So, how do I have a channel from the host launcher to the guest kernel with only one queue which is used to send data exclusively into the guest? I've been following virtio_balloon as an example. -Earlence
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