[Qemu-devel] [RFC PATCH v6 0/6] Virtio refactoring.

[fred.konrad@greensocs.com]

From: KONRAD Frederic <fred.konrad@greensocs.com>

You can clone that from here :
git.greensocs.com/home/greensocs/git/qemu_virtio.git virtio_refactoring_v6

The problem with the last RFC v5 was that virtio-blk refactoring broke
virtio-blk-pci device ( SEGFAULT ). So I modify this last step to fix that
issue.

In order to not break anything, I think we have to refactor virtio-pci-blk in a
next step then add a supplementary step which clean virtio-blk 
( eg : fix the cast ).

Does it make sense ?

This patch-set is :
    * Introducing a virtio-bus which extends bus-state.
    * Implementing a virtio-pci-bus which extends virtio-bus.
    * Implementing a virtio-pci device which has a virtio-pci-bus.
    * Implementing virtio-device which extends device-states.
    * Implementing a virtio-blk which extends virtio-device.

The first patch is a modification of qdev-monitor.c, it forces the function
qbus_find_recursive(..) to return a non-full bus, and return an error if the
desired bus ( with "bus=" option ) is full. It add a max_dev field to the
bus_state structure. If max_dev=0 it has no limitation, if not the maximum
amount of device connected to the bus is max_dev.

Changes v5 -> v6:
    * Renamed virtio_common_init_ to virtio_init, modify virtio_common_init to
      allocate and call virtio_init. Drop the unused structure size parameters.
    * Renamed init/exit callback in VirtioBusClass.
    * Renamed virtio_blk_init virtio_blk_common_init.
    * Modified virtio_blk_init to call virtio_blk_common_init.

Changes v4 -> v5:
    * use ERROR_CLASS_GENERIC_ERROR in place of creating a new error type for
      the maximum device limitation. ( Peter )
    * Removed bus_in_use function. We assume that the virtio-bus is not in use,
      when plugin in. ( Peter )
    * Added virtio_bus_destroy_device().
    * Implemented the exit function of virtio-pci.
    * Implemented the init callback for virtio-pci ( must be modified, it still
      access vdev directly. ).
    * Implemented the exit callback for virtio-pci.
    * Started virtio-device refactoring.
    * Started virtio-blk refactoring. 

Changes v3 -> v4:
    * Added virtio-bus.o in Makefile.objs ( accidentally dropped from v3 ).
    * *const* TypeInfo in virtio-bus.
    * Introduced virtio-pci-bus.
    * Reintroduced virtio-pci.
    * Introduced virtio-device.
    * Started virtio-blk refactoring.
    * Added an error type in qerror.h for the "bus full" error.

Changes v2 -> v3:
    * Added VirtioBusClass.
    * Renamed VirtioBus -> VirtioBusState.
    * Renamed qbus -> parent_obj.
    * Plug the device only in a non-full bus.

Changes v1 -> v2:
    * All the little fix you suggest ( License, Debug printf, naming convention,
      ...)
    * Added get_virtio_device_id(), and remove the pci_id* from the VirtioBus
      structure.
    * Added virtio_bus_reset().
    * Added cast macros VIRTIO_BUS.
    * Added virtio_bus_plug_device.
    * Replaced the old-style "bus->qbus" by BUS() macro.

Fred.

KONRAD Frederic (6):
  qdev : add a maximum device allowed field for the bus.
  virtio-bus : Introduce virtio-bus
  virtio-pci-bus : Introduce virtio-pci-bus.
  virtio-pci : Refactor virtio-pci device.
  virtio-device : Refactor virtio-device.
  virtio-blk : Add the virtio-blk device.

 hw/Makefile.objs  |   1 +
 hw/qdev-core.h    |   2 +
 hw/qdev-monitor.c |  11 ++++
 hw/virtio-blk.c   | 101 ++++++++++++++++++++++++++++++++----
 hw/virtio-blk.h   |   4 ++
 hw/virtio-bus.c   | 111 ++++++++++++++++++++++++++++++++++++++++
 hw/virtio-bus.h   |  82 ++++++++++++++++++++++++++++++
 hw/virtio-pci.c   | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/virtio-pci.h   |  33 +++++++++++-
 hw/virtio.c       |  50 ++++++++++++++----
 hw/virtio.h       |  28 ++++++++++
 11 files changed, 550 insertions(+), 22 deletions(-)
 create mode 100644 hw/virtio-bus.c
 create mode 100644 hw/virtio-bus.h

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1.7.11.7