[Qemu-devel] [PATCH v4 0/5] char: non-blocking writes, virtio-console flow control

[Amit Shah]

Hello,

This series lets interested callers ask for an -EAGAIN return from the
chardev backends (only unix and tcp sockets as of now) to implement
their own flow control.

A new call, qemu_chr_write_nb() is added, that will fallback to
qemu_chr_write() if the backend file isn't non-blocking or if no
callback was supplied.

Support for other backend types is easy to add and will be done in
later patches.

Amit Shah (5):
  char: Let writers know how much data was written in case of errors
  char: Add qemu_chr_write_nb() for nonblocking writes
  char: unix/tcp: Add a non-blocking write handler
  virtio-console: Factor out common init between console and generic
    ports
  virtio-console: Throttle virtio-serial-bus if we can't consume any
    more guest data

 gdbstub.c            |    2 +-
 hw/debugcon.c        |    2 +-
 hw/escc.c            |    3 +-
 hw/etraxfs_ser.c     |    4 +-
 hw/mcf_uart.c        |    2 +-
 hw/pl011.c           |    2 +-
 hw/pxa2xx.c          |    2 +-
 hw/serial.c          |    2 +-
 hw/sh_serial.c       |    2 +-
 hw/syborg_serial.c   |    3 +-
 hw/usb-serial.c      |    2 +-
 hw/virtio-console.c  |  156 +++++++++++++++++++++++++++++++++++++++++++-------
 hw/xen_console.c     |    7 +-
 hw/xilinx_uartlite.c |    5 +-
 monitor.c            |    4 +-
 net/slirp.c          |    2 +-
 net/socket.c         |    4 +-
 qemu-char.c          |   94 +++++++++++++++++++++++++++---
 qemu-char.h          |    9 +++
 qemu_socket.h        |    3 +-
 20 files changed, 257 insertions(+), 53 deletions(-)