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[Qemu-devel] [PATCH 00/12] RFC: add Spice block device

From: Marc-André Lureau
Subject: [Qemu-devel] [PATCH 00/12] RFC: add Spice block device
Date: Thu, 20 Jun 2013 19:45:59 +0200


The following patch series implement a Spice block device, which
allows the client to redirect a block device using the NBD protocol,
which greatly simplifies the Spice code by reusing an existing
protocol, and allows sharing existing qemu NBD implementation.

This block device driver is a bit special, since it is successfully
initialized with size 0, and once the client is connected (or want to
change block device) it re-opens itself. For this to work, we allow a
block driver to be open with an existing opaque data.

The backend only support read-only device atm (although it shouldn't
be hard to add write support if necessary). Migration hasn't been
tested yet.

Usage with a CDROM drive:
 -device ide-cd,drive=cd -drive if=none,id=cd,readonly,file=spicebd:

The associated server and client bits are:

Marc-André Lureau (12):
  include: add missing config-host.h include
  char: add qemu_chr_fe_event()
  nbd: don't change socket block during negotiate
  Split nbd block client code
  nbd: pass export name as init argument
  nbd: make session_close() idempotent
  block: save the associated child in BlockDriverState
  block: extract make_snapshot() from bdrv_open()
  block: add "snapshot.size" option to avoid extra bdrv_open()
  block: learn to open a driver with a given opaque
  block: allow to call bdrv_open() with an opaque
  block: add spice block device backend

 block.c                   | 191 ++++++++++-------
 block/Makefile.objs       |   3 +-
 block/nbd-client.c        | 391 ++++++++++++++++++++++++++++++++++
 block/nbd-client.h        |  51 +++++
 block/nbd.c               | 394 ++++------------------------------
 block/spice.c             | 523 ++++++++++++++++++++++++++++++++++++++++++++++
 include/block/block_int.h |   1 +
 include/sysemu/char.h     |  10 +
 include/ui/qemu-spice.h   |   2 +
 nbd.c                     |   1 -
 qemu-char.c               |   7 +
 spice-qemu-char.c         |  10 +
 12 files changed, 1151 insertions(+), 433 deletions(-)
 create mode 100644 block/nbd-client.c
 create mode 100644 block/nbd-client.h
 create mode 100644 block/spice.c


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