Backporting virtio-console patches for F13 VirtioSerial feature

[Amit Shah]

Hello,

For the VirtioSerial F13 feature, a few patches need to be backported
from the linux-next tree. Rusty has put them up in his local queue and
they'll be pushed to Linus for 2.6.34.

The patches are

42de322 virtio: console: statically initialize virtio_cons
ddb20f0 hvc_console: make the ops pointer const.
14f5b2b virtio: console: We support only one device at a time
502d56a virtio: console: port encapsulation
bd035b3 virtio: console: encapsulate buffer information in a struct
db5f217 virtio: console: ensure add_inbuf can work for multiple ports as well
8bd5af9 virtio: console: introduce a get_inbuf helper to fetch bufs from in_vq
44ee715 virtio: console: use vdev->priv to avoid accessing global var.
982892b virtio: console: don't assume a single console port.
fadef8b virtio: console: remove global var
1d6770b virtio: console: struct ports for multiple ports per device.
468f638 virtio: console: ensure console size is updated on hvc open
9f6d918 virtio: console: Separate out console-specific data into a separate struct
07efa05 virtio: console: Separate out console init into a new function
6191b29 virtio: console: Separate out find_vqs operation into a different function
bfd9f44 virtio: console: Introduce function to hand off data from host to readers
e5b54b53 virtio: console: Introduce a send_buf function for a common path for sending data to host
8d5e5a7 virtio: console: Add a new MULTIPORT feature, support for generic ports
5966ef0 virtio: console: Prepare for writing to / reading from userspace buffers
2e62003 virtio: console: Associate each port with a char device
4954379 virtio: console: Add file operations to ports for open/read/write/poll
606ac80 virtio: console: Ensure only one process can have a port open at a time
c888962 virtio: console: Register with sysfs and create a 'name' attribute for ports
42eefd8 virtio: console: Remove cached data on port close
7c0ba1b virtio: console: Handle port hot-plug
9fe551d virtio: Add ability to detach unused buffers from vrings
d201dd5 virtio: console: Add ability to hot-unplug ports
0f015e0 virtio: console: Add debugfs files for each port to expose debug info
b431126 virtio: console: show error message if hvc_alloc fails for console ports

from today's linux-next tree.

The changes are confined to the drivers/virtio_console.c file (and a few
other drivers/char/hvc* files) which haven't seen changes since 2.6.32,
so these patches should apply as-is to the feodra tree.

A patch that was merged in the 2.6.33 cycle also is needed:

c0cefeb hvc_console: Export (GPL'ed) hvc_remove

I can send these patches out as a patch series if that's easier for
review.

Feature Page
  https://fedoraproject.org/wiki/Features/VirtioSerial
More info
  http://www.linux-kvm.org/page/VMchannel_Requirements

		Amit
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