Re: [Qemu-devel] [PATCH 3/5] s390: Add new channel I/O based virtio transport.

[Stefan Hajnoczi]

On Tue, Aug 7, 2012 at 3:52 PM, Cornelia Huck <address@hidden> wrote:
> Add a new virtio transport that uses channel commands to perform
> virtio operations.
>
> Add a new machine type s390-ccw that uses this virtio-ccw transport
> and make it the default machine for s390.
>
> Signed-off-by: Cornelia Huck <address@hidden>
> ---
>  hw/qdev-monitor.c      |   5 +
>  hw/s390-virtio.c       | 268 ++++++++++----
>  hw/s390x/Makefile.objs |   1 +
>  hw/s390x/virtio-ccw.c  | 962 
> +++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/s390x/virtio-ccw.h  |  77 ++++
>  vl.c                   |   1 +
>  6 files changed, 1243 insertions(+), 71 deletions(-)
>  create mode 100644 hw/s390x/virtio-ccw.c
>  create mode 100644 hw/s390x/virtio-ccw.h

Is the virtqueue still using vring and assuming the hypervisor reaches
into guest memory?

Can existing ccw device types access memory directly (for some reason
I assumed ccw always copies or send messages)?

Stefan