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[Qemu-devel] [PATCH v1 00/22] Convert migration to QIOChannel & support

From: Daniel P. Berrange
Subject: [Qemu-devel] [PATCH v1 00/22] Convert migration to QIOChannel & support TLS
Date: Tue, 12 Jan 2016 11:43:54 +0000

This is a formal posting of patches that were previously
previewed at:

  FYI: https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg00829.html

The primary goal of this series of patches is to support TLS on the
migration data channel. The bulk of the work in this series though,
is converting the various QEMUFile implementations to be baed on the
new QIOChannel framework.

At the end of this current series there is just one remaining impl
of QEMUFileOps that is not based on QIOChannel - the one in savevm.c
that is using BlockDriverState. It would be possible to create a
QIOChannel wrapper around BlockDriverState too, at which point all
QEMUFile impls would be QIOChannel based. This would then let us
cut out the QEMUFileOps driver callbacks entirely and thus simply
code even more. This patch series is already too large, so I left
that for now.

The first 6 patchs are some basic clean ups to QEMUFile code

The 7th patch introduces the QIOChannel based QEMUFile impl

Patches 8-14 convert the various migration protocols to use
the QIOChannel based QEMUFile impl.

Patches 15-18 remove the now unused QEMUFile impls that do
not use QIOChanel

Patches 19, 21 and 22 does some more cleanup

Patch 20 achieves the original stated primary goal of adding
TLS encryption to the TCP migration backend.

Overall we have a net win of deleting 500 lines of code,
despite adding more features, which is always nice.

I testing unix, tcp, exec migrations. I don't have the ability
to test RDMA migration, and that's the patch I'm also least
confident about code quality of, so would appreciated some
independant testing of that one in particular.

Daniel P. Berrange (22):
  s390: use FILE instead of QEMUFile for creating text file
  migration: remove use of qemu_bufopen from vmstate tests
  migration: ensure qemu_fflush() always writes full data amount
  migration: split migration hooks out of QEMUFileOps
  migration: introduce set_blocking function in QEMUFileOps
  migration: force QEMUFile to blocking mode for outgoing migration
  migration: introduce a new QEMUFile impl based on QIOChannel
  migration: convert post-copy to use QIOChannelBuffer
  migration: convert unix socket protocol to use QIOChannel
  migration: convert tcp socket protocol to use QIOChannel
  migration: convert fd socket protocol to use QIOChannel
  migration: convert exec socket protocol to use QIOChannel
  migration: convert RDMA to use QIOChannel interface
  migration: convert savevm to use QIOChannel for writing to files
  migration: delete QEMUFile buffer implementation
  migration: delete QEMUSizedBuffer struct
  migration: delete QEMUFile sockets implementation
  migration: delete QEMUFile stdio implementation
  migration: move definition of struct QEMUFile back into qemu-file.c
  migration: support TLS encryption with TCP migration backend
  migration: remove support for non-iovec based write handlers
  migration: remove qemu_get_fd method from QEMUFile

 docs/migration.txt             |   4 +-
 hw/s390x/s390-skeys.c          |  19 +-
 include/migration/qemu-file.h  |  57 ++---
 include/qemu/typedefs.h        |   1 -
 include/sysemu/sysemu.h        |   2 +-
 migration/Makefile.objs        |   6 +-
 migration/exec.c               |  48 +++--
 migration/fd.c                 |  57 +++--
 migration/migration.c          |  24 +--
 migration/qemu-file-buf.c      | 463 -----------------------------------------
 migration/qemu-file-channel.c  | 201 ++++++++++++++++++
 migration/qemu-file-internal.h |  53 -----
 migration/qemu-file-stdio.c    | 195 -----------------
 migration/qemu-file-unix.c     | 324 ----------------------------
 migration/qemu-file.c          | 110 +++++-----
 migration/rdma.c               | 256 ++++++++++++++---------
 migration/savevm.c             |  57 ++---
 migration/tcp.c                | 372 +++++++++++++++++++++++++++++----
 migration/unix.c               | 103 +++++----
 qemu-options.hx                |   7 +-
 tests/Makefile                 |   6 +-
 tests/test-vmstate.c           |  55 ++---
 22 files changed, 975 insertions(+), 1445 deletions(-)
 delete mode 100644 migration/qemu-file-buf.c
 create mode 100644 migration/qemu-file-channel.c
 delete mode 100644 migration/qemu-file-internal.h
 delete mode 100644 migration/qemu-file-stdio.c
 delete mode 100644 migration/qemu-file-unix.c


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