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[Qemu-devel] [PATCH 00/19] Kemari for KVM v0.2.1

From: Yoshiaki Tamura
Subject: [Qemu-devel] [PATCH 00/19] Kemari for KVM v0.2.1
Date: Fri, 24 Dec 2010 12:18:09 +0900


This patch series is a revised version of Kemari for KVM, which
applied comments for the previous post.  The current code is based on
qemu.git 9ed5726c043958359b0f1fa44ab3e4f25f9d9a47.

The changes from v0.2 -> v0.2.1 are:

- Move event-tap to net/block layer and use stubs (Blue, Paul, MST, Kevin)
- Tap bdrv_aio_flush (Marcelo)
- Remove multiwrite interface in event-tap (Stefan)
- Fix event-tap to use pio/mmio to replay both net/block (Stefan)
- Improve error handling in event-tap (Stefan)
- Fix leak in event-tap (Stefan)
- Revise virtio last_avail_idx manipulation (MST)
- Clean up migration.c hook (Marcelo)
- Make deleting change state handler robust (Isaku, Anthony)

Note that Making iov save/load common (Stefan) was no good becase of
compile issue with ram_addr_t.

The changes from v0.1.1 -> v0.2 are:

- Introduce a queue in event-tap to make VM sync live.
- Change transaction receiver to a state machine for async receiving.
- Replace net/block layer functions with event-tap proxy functions.
- Remove dirty bitmap optimization for now.
- convert DPRINTF() in ft_trans_file to trace functions.
- convert fprintf() in ft_trans_file to error_report().
- improved error handling in ft_trans_file.
- add a tmp pointer to qemu_del_vm_change_state_handler.

The changes from v0.1 -> v0.1.1 are:

- events are tapped in net/block layer instead of device emulation layer.
- Introduce a new option for -incoming to accept FT transaction.

- Removed writev() support to QEMUFile and FdMigrationState for now.
  I would post this work in a different series.

- Modified virtio-blk save/load handler to send inuse variable to
  correctly replay.

- Removed configure --enable-ft-mode.
- Removed unnecessary check for qemu_realloc().

The first 6 patches modify several functions of qemu to prepare
introducing Kemari specific components.

The next 6 patches are the components of Kemari.  They introduce
event-tap and the FT transaction protocol file based on buffered file.
The design document of FT transaction protocol can be found at,

Then the following 2 patches modifies net/block layer functions with
event-tap functions.  Please note that if Kemari is off, event-tap
will just passthrough, and there is most no intrusion to exisiting
functions including normal live migration.

Finally, the migration layer are modified to support Kemari in the
last 5 patches.  Again, there shouldn't be any affection if a user
doesn't specify Kemari specific options.  The transaction is now async
on both sender and receiver side.  The sender side respects the
max_downtime to decide when to switch from async to sync mode.

The repository contains all patches I'm sending with this message.
For those who want to try, please pull the following repository.  It
also includes dirty bitmap optimization which aren't ready for posting
yet.  To remove the dirty bitmap optimization, please look at HEAD~7
of the tree.  Also, please note that it's based on a bit older version
of qemu.git because of testing.  There aren't major conflicts with the
patch series posted.


Happy Holidays!


Yoshiaki Tamura (19):
  Make QEMUFile buf expandable, and introduce qemu_realloc_buffer() and
  Introduce read() to FdMigrationState.
  Introduce skip_header parameter to qemu_loadvm_state().
  qemu-char: export socket_set_nodelay().
  vl.c: add deleted flag for deleting the handler.
  virtio: update last_avail_idx when inuse is decreased.
  Introduce fault tolerant VM transaction QEMUFile and ft_mode.
  savevm: introduce util functions to control ft_trans_file from savevm
  Introduce event-tap.
  Call init handler of event-tap at main() in vl.c.
  ioport: insert event_tap_ioport() to ioport_write().
  Insert event_tap_mmio() to cpu_physical_memory_rw() in exec.c.
  net: insert event-tap to qemu_send_packet() and
  block: insert event-tap to bdrv_aio_writev() and bdrv_aio_flush().
  savevm: introduce qemu_savevm_trans_{begin,commit}.
  migration: introduce migrate_ft_trans_{put,get}_ready(), and modify
    migrate_fd_put_ready() when ft_mode is on.
  migration-tcp: modify tcp_accept_incoming_migration() to handle
    ft_mode, and add a hack not to close fd when ft_mode is enabled.
  Introduce -k option to enable FT migration mode (Kemari).
  migration: add a parser to accept FT migration incoming mode.

 Makefile.objs   |    1 +
 Makefile.target |    1 +
 block.c         |   11 +
 event-tap.c     |  806 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 event-tap.h     |   42 +++
 exec.c          |    4 +
 ft_trans_file.c |  606 +++++++++++++++++++++++++++++++++++++++++
 ft_trans_file.h |   72 +++++
 hmp-commands.hx |    7 +-
 hw/hw.h         |    7 +
 hw/virtio.c     |    8 +-
 ioport.c        |    2 +
 migration-tcp.c |   60 ++++-
 migration.c     |  280 +++++++++++++++++++-
 migration.h     |    3 +
 net.c           |    9 +
 qemu-char.c     |    2 +-
 qemu-tool.c     |   23 ++
 qemu_socket.h   |    1 +
 qmp-commands.hx |    7 +-
 savevm.c        |  280 ++++++++++++++++++-
 sysemu.h        |    4 +-
 trace-events    |   25 ++
 vl.c            |   16 +-
 24 files changed, 2248 insertions(+), 29 deletions(-)
 create mode 100644 event-tap.c
 create mode 100644 event-tap.h
 create mode 100644 ft_trans_file.c
 create mode 100644 ft_trans_file.h

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