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[Xen-devel] [PATCH v4 0/3] usb, xen: add pvUSB backend

This series adds a Xen pvUSB backend driver to qemu. USB devices
connected to the host can be passed through to a Xen guest. The
devices are specified via Xenstore. Access to the devices is done
via host-libusb.c

I've tested the backend with various USB devices (memory sticks,
keyboard, ...).

Changes in V4:
- patch 2: don't allow guest reading the new directory as requested by
  Anthony Perard

Changes in V3:
- added new patch 2 (was sent formerly on it's own)
- patch 3 (was 2): multiple small changes as requested by Anthony Perard
- patch 3 (was 2): check for full ring in case of hotplug events as
  requested by Anthony Perard
- patch 3 (was 2): use RING_COPY_REQUEST() instead of RING_GET_REQUEST()
- patch 3 (was 2): add check for required header version and disable
  backend in case header is too old

Changes in V2:
- rebased to current qemu master
- removed support for isoc requests in this series, as the optimal way to
  support those isn't clear yet. Will be added in a followup series.
- several changes as requested by Stefano Stabellini and Konrad Wilk

Changes since RFC:
- open device via qdev_device_add(), making patch 1 obsolete
- modify patch 2 to use isoc passthrough via libusb instead of one
  job per frame

Juergen Gross (3):
  xen: introduce dummy system device
  xen: write information about supported backends
  xen: add pvUSB backend

 hw/usb/Makefile.objs         |    4 +
 hw/usb/xen-usb.c             | 1080 ++++++++++++++++++++++++++++++++++++++++++
 hw/xen/xen_backend.c         |   60 +++
 hw/xen/xen_devconfig.c       |   52 +-
 hw/xenpv/xen_machine_pv.c    |   43 ++
 include/hw/xen/xen_backend.h |    6 +
 include/hw/xen/xen_common.h  |    2 +
 7 files changed, 1197 insertions(+), 50 deletions(-)
 create mode 100644 hw/usb/xen-usb.c


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